Better to Give than to Receive: Predictive Directional Measurement of Volatility Spillovers


 Phillip Park
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1 Forthcomin, International Journal of Forecastin Better to Give than to Receive: Predictive Directional Measurement of Volatility Spillovers Francis X. Diebold University of Pennsylvania and NBER Kamil Yilmaz Koç University, Istanbul First draft/print: November 8 This draft/print: March Abstract: Usin a eneralized vector autoreressive framework in which forecasterror variance decompositions are invariant to variable orderin, we propose measures of both total and directional volatility spillovers. We use our methods to characterize daily volatility spillovers across U.S. stock, bond, forein exchane and commodities markets, from January 999 throuh January. We show that despite sinificant volatility fluctuations in all four markets durin the sample, crossmarket volatility spillovers were quite limited until the lobal financial crisis that bean in 7. As the crisis intensified so too did the volatility spillovers, with particularly important spillovers from the stock market to other markets takin place after the collapse of Lehman Brothers in September 8. JEL classification numbers: G, F3 Keywords: Asset Market, Asset Return, Stock Market, Market Linkae, Financial Crisis, Contaion, Vector Autoreression, Variance Decomposition Acknowledements: For helpful comments we thank two anonymous referees and participants in the Cemapre / IIF International Workshop on the Predictability of Financial Markets, especially Nuno Crato, Antonio Espasa, Antonio GarciaFerrer, Raquel Gaspar, and Esther Ruiz. All errors, however, are entirely ours. We thank the National Science Foundation for financial support.
2 . Introduction Financial crises occur with notable reularity, and moreover, they display notable similarities (e.., Reinhart and Rooff, 8). Durin crises, for example, financial market volatility enerally increases sharply and spills over across markets. One would naturally like to be able to measure and monitor such spillovers, both to provide early warnin systems for emerent crises, and to track the proress of extant crises. Motivated by such considerations, Diebold and Yilmaz (DY, 9) introduce a volatility spillover measure based on forecast error variance decompositions from vector autoreressions (VARs). It can be used to measure spillovers in returns or return volatilities (or, for that matter, any return characteristic of interest) across individual assets, asset portfolios, asset markets, etc., both within and across countries, revealin spillover trends, cycles, bursts, etc. In addition, althouh it conveys useful information, it nevertheless sidesteps the contentious issues associated with definition and existence of episodes of contaion or herd behavior. However, the DY framework as presently developed and implemented has several limitations, both methodoloical and substantive. Consider the methodoloical side. First, DY relies on Choleskyfactor identification of VARs, so the resultin variance decompositions can be dependent on variable orderin. One would prefer a spillover measure invariant to orderin. Second, and crucially, DY addresses only total spillovers VAR variance decompositions, introduced by Sims (98), record how much of the Hstepahead forecast error variance of some variable, i, is due to innovations in another variable, j. On contaion (or lack thereof) see, for example, Forbes and Riobon ().
3 (from/to each market i, to/from all other markets, added across i). One would also like to examine directional spillovers (from/to a particular market). Now consider the substantive side. DY considers only the measurement of spillovers across identical assets (equities) in different countries. But various other possibilities are also of interest, includin individualasset spillovers within countries (e.., amon the thirty Dow Jones Industrials in the U.S.), across asset classes (e.., between stock and bond markets in the U.S.), and of course various blends. Spillovers across asset classes, in particular, are of key interest iven the recent lobal financial crisis (which appears to have started in credit markets but spilled over into equities), but they have not yet been investiated in the DY framework. In this paper we fill these methodoloical and substantive aps. We use a eneralized vector autoreressive framework in which forecasterror variance decompositions are invariant to variable orderin, and we explicitly include directional volatility spillovers. We then use our methods in a substantive empirical analysis of daily volatility spillovers across U.S. stock, bond, forein exchane and commodities markets over a ten year period, includin the recent lobal financial crisis. We proceed as follows. In section we discuss our methodoloical approach, emphasizin in particular our new use of eneralized variance decompositions and directional spillovers. In section 3 we describe our data and present our substantive results. We conclude in section 4.
4 . Methods: Generalized Spillover Definition and Measurement Here we extend the DY spillover index, which follows directly from the familiar notion of a variance decomposition associated with an Nvariable vector autoreression. Whereas DY focuses on total spillovers in a simple VAR framework (i.e., with potentially orderdependent results driven by Cholesky factor orthoonalization), we proress by measurin directional spillovers in a eneralized VAR framework that eliminates the possible dependence of results on orderin. Consider a covariance stationary Nvariable VAR(p), p x = Φ x + ε, where t i t i t i= ε (, Σ) is a vector of independently and identically distributed disturbances. The movin averae representation is x = Aε, where the NxN coefficient matrices A i obey the t i t i i= recursion A =Φ A +Φ A Φ A, with A an NxN identity matrix and A i = for i i i p i p i<. The movin averae coefficients (or transformations such as impulseresponse functions or variance decompositions) are the key to understandin the dynamics of the system. We rely on variance decompositions, which allow us to parse the forecast error variances of each variable into parts attributable to the various system shocks. Variance decompositions allow us to assess the fraction of the Hstepahead error variance in forecastin x i that is due to shocks to x, j i, for each i. j Calculation of variance decompositions requires orthoonal innovations, whereas our VAR innovations are enerally contemporaneously correlated. Identification schemes such as that based on Cholesky factorization achieve orthoonality, but the variance decompositions then depend on orderin of the variables. We circumvent this problem by 3
5 exploitin the eneralized VAR framework of Koop, Pesaran and Potter (996) and Pesaran and Shin (998), hereafter KPPS, which produces variance decompositions invariant to orderin. Instead of attemptin to orthoonalize shocks, the eneralized approach allows correlated shocks but accounts for them appropriately usin the historically observed distribution of the errors. As the shocks to each variable are not orthoonalized, the sum of contributions to the variance of forecast error (that is, the row sum of the elements of the variance decomposition table) is not necessarily equal to one. Variance Shares Let us define own variance shares to be the fractions of the Hstepahead error variances in forecastin x i due to shocks to x i, for i=,,..,n, and cross variance shares, or spillovers, to be the fractions of the Hstepahead error variances in forecastin x i due to shocks to x j, for i, j =,,.., N, such that i j. Denotin the KPPS Hstepahead forecast error variance decompositions by θ ( H), for H =,,..., we have ij σ θ ( H ) = ij H ' ii ( ea ) i hσe h= j H ' ' ( ea ) h i hσae = h i () where Σ is the variance matrix for the error vector ε, σ ii is the standard deviation of the error term for the ith equation and ei is the selection vector with one as the ith element and zeros otherwise. As explained above, the sum of the elements of each row of the variance decomposition table is not equal to : N j= θ ( H ). In order to use the information ij 4
6 available in the variance decomposition matrix in the calculation of the spillover index, we normalize each entry of the variance decomposition matrix by the row sum as 3 : θij ( H ) θij ( H) = N () θ ( H) j= ij Note that, by construction, N θij ( H ) = and j= N θij ( H ) = N. i, j= Total Spillovers Usin the volatility contributions from the KPPS variance decomposition, we can construct a total volatility spillover index: S N N θij H ij i, j= i, j= i j i j i N θij ( H ) i, j= ( ) θ ( H) ( H) = = i. (3) N This is the KPPS analo of the Cholesky factor based measure used in Diebold and Yilmaz (9). The total spillover index measures the contribution of spillovers of volatility shocks across four asset classes to the total forecast error variance. Directional Spillovers Althouh it is sufficient to study the total volatility spillover index to understand how much of shocks to volatility spill over across major asset classes, the eneralized VAR approach enables us to learn about the direction of volatility spillovers across major asset 3 Alternatively, we can normalize the elements of the variance decomposition matrix with the column sum of these elements and compare the resultin total spillover index with the one obtained from the normalization with the row sum. 5
7 classes. As the eneralized impulse responses and variance decompositions are invariant to the orderin of variables, we calculate the directional spillovers usin the normalized elements of the eneralized variance decomposition matrix. We measure directional volatility spillovers received by market i from all other markets j as: S ii N j= j i N j= θ ( H ) ij ( H) = i θ ( H ) ij (4) In similar fashion we measure directional volatility spillovers transmitted by market i to all other markets j as: S ii N j= j i N j= θ ( H ) ( H) = i θ ( H ) ji ji (5) One can think of the set of directional spillovers as providin a decomposition of total spillovers into those comin from (or to) a particular source. Net Spillovers We obtain the net volatility spillover from market i to all other markets j as S ( H) = S ( H) S ( H) i ii ii (6) The net volatility spillover is simply the difference between ross volatility shocks transmitted to and ross volatility shocks received from all other markets. Net Pairwise Spillovers 6
8 The net volatility spillover (6) provides summary information about how much in net terms each market contributes to volatility in other markets. It is also of interest to examine net pairwise volatility spillovers, which we define as: S θ ( H) θ ( H) ( ) i ( ) ( H) ij ji ij H = N N θik H θ jk k= k= (7) The net pairwise volatility spillover between markets i and j is simply the difference between ross volatility shocks transmitted from market i to j and ross volatility shocks transmitted from j to i. 3. Empirics: Estimates of Volatility Spillovers across U.S. Asset Markets Here we use our framework to measure volatility spillovers amon four key U.S. asset classes: stocks, bonds, forein exchane and commodities. This is of particular interest because spillovers across asset classes may be an important aspect of the lobal financial crisis that bean in 7. In the remainder of this section we proceed as follows. We bein by describin our data in section 3a. Then we calculate averae (i.e., total) spillovers in section 3b. We then quantify spillover dynamics, examinin rollinsample total spillovers, rollinsample directional spillovers, rollinsample net directional spillovers and rollinsample net pairwise spillovers below. Stock, Bond, Exchane Rate, and Commodity Market Volatility Data We examine daily volatilities of returns on U.S. stock, bond, forein exchane, and commodity markets. In particular, we examine the S&P 5 index, the year Treasury 7
9 bond yield, the New York Board of Trade U.S. dollar index futures, and the DowJones/UBS commodity index. 4 The data span January 5, 999 throuh January 9,, for a total of 77 daily observations. In the tradition of a lare literature datin at least to Parkinson (98), we estimate daily variance usin daily hih and low prices. 5 For market i on day t we have max min σ it =.36 ln( Pit ) ln( Pit ), where min P is the maximum (hih) price in market i on day t, and P is the daily minimum max it it (low) price. Because σ is an estimator of the daily variance, the correspondin estimate of it the annualized daily percent standard deviation (volatility) is ˆ σ = 365 σ. We plot the four markets volatilities in Fiure and we provide summary statistics of lo volatility in Table. Several interestin facts emere, includin: () The bond and stock markets have been the most volatile (rouhly equally so), with commodity and FX markets comparatively less volatile, () volatility dynamics appear hihly persistent, in keepin with a lare literature summarized for example in Andersen, Bollerslev, Christoffersen and Diebold (6), and (3) all volatilities are hih durin the recent crisis, with stock and bond market volatility, in particular, displayin hue jumps. Throuhout the sample, stock market went throuh two periods of major volatility. In 999, daily stock market volatility was close to 5 percent, but it increased sinificantly to above 5 percent and fluctuated around that level until mid3, movin occasionally above 5 percent. After mid3, it declined to less than 5 percent and stayed there until Auust it it 4 The DJ/AIG commodity index was rebranded as the DJ/UBS commodity index followin the acquisition of AIG Financial Products Corp. by UBS Securities LLC on May 6, 9. 5 For backround, see Alizadeh, Brandt and Diebold () and the references therein. 8
10 7. Since Auust 7, stock market volatility reflects the dynamics of the subprime crisis quite well. In the first half of our sample, the interest rate volatility measured by the annualized standard deviation was comparable to the stock market volatility. While it was lower than 5 percent mark for most of, in the first and last few months of, it increased and fluctuated between 55 percent. Bond market volatility remained hih until mid5, and fell below 5 percent from late 5 throuh the first half of 7. Since Auust 7, volatility in bond markets has also increased sinificantly. Commodity market volatility used to be very low compared to stock and bond markets, but it increased slihtly over time and especially in 56 and recently in 8. FX market volatility has been the lowest amon the four markets. It increased in 8 and moved to a 55 percent band followin the collapse of Lehman Brothers in September 8. Since then, FX market volatility declined, but it is still above its averae for the last decade. Unconditional Patterns: The FullSample Volatility Spillover Table We call Table as volatility spillover table. Its th ij entry is the estimated contribution to the forecast error variance of market i comin from innovations to market j. 6 Hence the offdiaonal column sums (labeled contributions to others) or row sums (labeled contributions from others), are the to and from directional spillovers, and the from 6 All results are based on vector autoreressions of order 4 and eneralized variance decompositions of dayahead volatility forecast errors. To check for the sensitivity of the results to the choice of the order of VAR we calculate the spillover index for orders throuh 6, and plot the minimum, the maximum and the median values obtained in Fiure A of the Appendix. Similarly, we calculated the spillover index for forecast horizons varyin from 4 days to days. Both Fiure A and Fiure A of the Appendix show that the total spillover plot is not sensitive to the choice of the order of VAR or to the choice of the forecast horizon. 9
11 minus to differences are the net volatility spillovers. In addition, the total volatility spillover index appears in the lower riht corner of the spillover table. It is approximately the rand offdiaonal column sum (or row sum) relative to the rand column sum includin diaonals (or row sum includin diaonals), expressed as a percent. 7 The volatility spillover table provides an approximate inputoutput decomposition of the total volatility spillover index. Consider first what we learn from the table about directional spillovers (ross and net). From the directional to others row, we see that ross directional volatility spillovers to others from each of the four markets are not very different. We also see from the directional from others column that ross directional volatility spillovers from others to the bond market is relatively lare, at 8.5 percent, followed by the FX market with the spillovers from others explainin 4. percent of the forecast error variance. As for net directional volatility spillovers, the larest are from the stock market to others (6.9.4=5.5 percent) and from others to the FX market (.44.4=.8 percent). Now consider the total (nondirectional) volatility spillover, which is effectively a distillation of the various directional volatility spillovers into a sinle index. The total volatility spillover appears in the lower riht corner of Table, which indicates that on averae, across our entire sample,.6 percent of volatility forecast error variance in all four markets comes from spillovers. The summary of Table is simple: Both total and directional spillovers over the full sample period were quite low. 7 As we have already discussed in Section in detail, the approximate nature of the claim stems from the properties of the eneralized variance decomposition. With Cholesky factor identification the claim is exact rather than approximate; see also Diebold and Yilmaz (9).
12 Conditionin and Dynamics I: The RollinSample Total Volatility Spillover Plot Clearly, many chanes took place durin the years in our sample, January 999 January. Some are welldescribed as moreorless continuous evolution, such as increased linkaes amon lobal financial markets and increased mobility of capital, due to lobalization, the move to electronic tradin, and the rise of hede funds. Others, however, may be better described as bursts that subsequently subside. Given this backround of financial market evolution and turbulence, it seems unlikely that any sinle fixedparameter model would apply over the entire sample. Hence the fullsample spillover table and spillover index constructed earlier, althouh providin a useful summary of averae volatility spillover behavior, likely miss potentially important secular and cyclical movements in spillovers. To address this issue, we now estimate volatility spillovers usin day rollin samples, and we assess the extent and the nature of spillover variation over time via the correspondin time series of spillover indices, which we examine raphically in the socalled total spillover plot of Fiure. Startin at a value slihtly lower than 5 percent in the first window, the total volatility spillover plot for most of the time fluctuates between ten and twenty percent. However, there are important exceptions: The spillovers exceed the twenty percent mark in mid6 and most importantly by far exceed the thirty percent level, durin the lobal financial crisis of 79. We can identify several cycles in the total spillover plot. The first cycle started with the burst of the tech bubble in and the index climbed from 3 percent to percent. In the second half of the index increased to percent aain, before droppin back to percent at the end of January. After hittin the bottom in mid, the index went
13 throuh three relatively small cycles until the end of 5. The first cycle started in mid and lasted until the last quarter of 3. The second cycle was shorter, startin in the first quarter of 4 and endin in the third quarter. The third cycle durin this period starts in the middle of 4 and lasts until the end of 5. All three cycles involve movements of the index between and 5 percent. After the rather calm era from 3 throuh 5, the spillover index recorded a sinificant upward move in May throuh the end of 6. On May 9 th 6 the Federal Open Market Committee of the Federal Reserve decided to increase the federal funds taret rate from 4.75 percent to 5. percent and sinaled the likelihood of another increase in its June meetin. 8 After this decision the total spillover index increased from percent at the end of April 6 to 4 percent by November 6. The fact that FED was continuin to tihten the monetary policy led to an increase in volatility in the bond and FX markets which spilled over to other markets. Finally, the most interestin part of the total spillover plot concerns the recent financial crisis. One can see four volatility waves durin the recent crisis: JulyAuust 7 (credit crunch), JanuaryMarch 8 (panic in stock and forein exchane markets followed by an unscheduled rate cut of threequarters of a percentae points by Federal Reserve and Bear Stearns takeover by JP Moran in March), SeptemberDecember 8 (followin the collapse of Lehman Brothers) and in the first half of 9 as the financial crisis started to have its real effects around the world. Durin the JanuaryMarch 8 episode, and especially followin the collapse of Lehman Brothers in midseptember and consistent with 8 Indeed, the FOMC increased the federal funds taret rate to 5.5 percent in its June meetin and kept it at that level for more than a year until its September 7 meetin.
14 an unprecedented evaporation of liquidity worldwide, the spillover index sures above thirty percent. Conditionin and Dynamics II: RollinSample Gross Directional Volatility Spillover Plots Thus far we have discussed the total spillover plot, which is of interest but discards directional information. That information is contained in the Directional TO Others row (the sum of which is iven by S ( H) ii in equation 4) and the Directional FROM Others column (the sum of which is iven by Si i ( H) in equation 5). We now estimate the abovementioned row and column of Table dynamically, in a fashion precisely parallel to the earlierdiscussed total spillover plot. We call these directional spillover plots. In Fiure 3, we present the directional volatility spillovers from each of the four asset classes to others (corresponds to the directional to others row in Table ). They vary reatly over time. Durin tranquil times, spillovers from each market are below five percent, but durin volatile times, directional spillovers increase close to percent. Amon the four markets, ross volatility spillovers from the commodity markets to others are in enerally smaller than the spillovers from the other three markets. In Fiure 4, we present directional volatility spillovers from others to each of the four asset classes (corresponds to the directional from others column in Table ). As with the directional spillovers to others, the spillovers from others vary noticeably over time. The relative variation pattern, however, is reversed, with directional volatility spillovers to commodities and FX increasin relatively more in turbulent times. 3
15 Conditionin and Dynamics III: RollinSample Net Directional Volatility Spillover Plots Above we briefly discussed the ross spillover plots, because our main focus point is the net directional spillover plot presented in Fiure 5. Each point in Fiure 5a throuh 5d corresponds S ( H ) (equation 6) and is the difference between the Contribution from i column sum and the Contribution to row sum. In addition, as we described briefly at the end of section, we also calculate net pairwise spillovers between two markets (equation 7) and present these plots in Fiure 6. Until the recent lobal financial crisis net volatility spillovers from/to each of the four markets never exceeded the three percent mark (Fiure 5). Furthermore, until 7 all four markets were at both the ivin and receivin ends of net volatility transmissions, with almost equal manitudes. Thins chaned dramatically since January 8. Net volatility spillovers from the stock market stayed positive throuhout the several staes of the crisis, reachin as hih as six percent after the collapse of the Lehman Brothers in September 8. As we have already introduced the net spillover and net pairwise spillover plots, we can now have a detailed analysis of the spillovers from each market to the others usin Fiures 5 and 6. From 999 to 9, there were three major episodes of net volatility spillovers takin place from the stock market to other markets (Fiure 5a): durin, in thru 3, and after January 8. In our sample period, the first round of volatility spillovers took place from the stock market with the burst of the technoloy bubble in. As the troubles of the technoloy stocks intensified after March, the spillover index reached close to percent in the second throuh the last quarter of (Fiure ). At the time, the bulk of the volatility spillovers from the stock market were transmitted first to the bond, and then, to the commodity markets (Fiure 6a and 6b). 4
16 The second period when the stock market was a net transmitter of volatility to other markets spanned from the second half of to the third quarter of 3. Technoloy stocks continued to be under pressure until October as the Nasdaq Composite Index hit its lowest level since 997. In addition, the Iraqi crisis and the prospects of a war in the reion increased volatility in the US stock markets. 9 Durin this episode, total spillover index increased from 7.5 percent in June to 5 percent in June 3. Net volatility spillovers from the stock market reached close to 3 percent (Fiure 5a), and affected mostly the bond market (Fiure 6a). The fact that stock market was at the same time a net receiver of volatility from the commodity market (Fiure 6b) shows the link between increased volatility in stock markets and the impendin Iraqi War at the time. While the first two episodes of net volatility spillovers from the stock market were important, the third took place durin the worst financial crisis that hit the lobal financial markets. Since January 8, the total spillovers jumped to above 3 percent twice, in the first quarter and the fourth quarters of 8. Durin these two bouts of hefty volatility spillovers across financial markets, net spillovers from the stock market jumped to more than three and seven percents, respectively (Fiure 5a). The volatility from the stock market was transmitted to all three markets, but especially to the FX market (close to five percent) followin the collapse of the Lehman Brothers (Fiure 6c). Actually, durin the lobal financial crisis FX market also received sizeable net volatility spillovers from the bond market (Fiure 6e) as well as the commodity market (Fiure 6f). Net volatility spillovers from the bond market tend to be smaller than net spillovers from other markets. We identify three episodes of net volatility spillovers from the bond 9 Leih et al. (3) showed that a percentae point rise in the probability of a war on Iraq lowered the S&P5 by about one and a half percentae points. 5
17 market: the second half of throuh ; the end of 5 throuh 6; and throuhout 7 (Fiure 5b). In, the spillovers went in the direction of the FX market (Fiure 6e). In, on the other hand, the bulk of volatility spillovers from the bond market were transmitted to the stock market (Fiure 6a) and the commodity market (Fiure 6d). In the second half of 5 and the first half of 6 spillovers from the bond market were transmitted mostly to the FX market. In 7, on the other hand, the bond market spillovers affected the FX market mostly followed by the commodity market. We identify four episodes of net volatility spillovers from the commodity markets: Throuhout, in the first five months of 3 (before and immediately after the invasion of Iraq in March 3), in late 4 and throuh 5, and in the second half of 9 (Fiure 5c). Durin 3, the commodity market was a net transmitter of volatility (Fiure 5c). The oil prices started to increase from less than $ at the end of to close to $4 by February 3, before fallin to almost $5 by the end of April 3. Volatility spillovers from commodity markets increased in 3 just before and durin the invasion of Iraq by U.S. forces. Volatility spillovers from the commodity markets also increased, at the end of 4 and early 5, when the sure in Chinese demand for oil and metals surprised investors sendin commodity prices hiher (these shocks mostly transmitted to the bond and FX markets, See Fiures 6d and 6e), and especially from March 9 throuh September 9 (shocks mostly transmitted to the FX market). The volatility shocks in the commodity market in and durin the initial phases of the Iraqi invasion spilled over mostly to the stock market (Fiure 6b), but also to the bond market (Fiure 6d). Durin the late 4early 5 and the first half of 8, the volatility shocks in the commodity market mostly spilled over to the bond market (Fiure 6d), but also to the FX market (Fiure 6f). While 6
18 commodity market was a net recipient of modest levels of volatility shocks from the stock and bond markets, it was a net transmitter to the FX market durin 9. In the case of FX markets, there were three major episodes of positive net spillovers. Net volatility spillovers from FX markets had little impact on volatility in other markets, perhaps with the exception of the modest spillovers at the end of and early, from the end of throuh first half of 3, and finally in the second half of 6 (Fiure 5d). Net volatility spillovers from the FX market increased at the end of and early. It also increased in May 6, followin the FED s decision to tihten the monetary policy further (Fiure 5d). In both episodes, the volatility shocks in the FX market spilled over to the stock market and the commodity market (Fiures 6c and 6f). 4. Concludin Remarks We have provided both ross and net directional spillover measures that are independent of the orderin used for volatility forecast error variance decompositions. When applied to U.S. financial markets, our measures shed new liht on the nature of crossmarket volatility transmission, pinpointin the importance durin the recent crisis of volatility spillovers from the stock market to other markets. We are of course not the first to consider issues related to volatility spillovers (e.., Enle et al. 99; Kin et al., 994; Edwards and Susmel, ), but our approach is very different. It produces continuouslyvaryin indexes (unlike, for example, the hih state / low state indicator of Edwards and Susmel), and it is econometrically tractable even for very lare numbers of assets. Althouh it is beyond the scope of this paper, it will be interestin in 7
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