The U.S. Treasury Yield Curve: 1961 to the Present


 Corey Woods
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1 Finance and Economics Discussion Series Divisions of Research & Saisics and Moneary Affairs Federal Reserve Board, Washingon, D.C. The U.S. Treasury Yield Curve: 1961 o he Presen Refe S. Gurkaynak, Brian Sack, and Jonahan H. Wrigh 68 NOTE: Saff working papers in he Finance and Economics Discussion Series (FEDS) are preliminary maerials circulaed o simulae discussion and criical commen. The analysis and conclusions se forh are hose of he auhors and do no indicae concurrence by oher members of he research saff or he Board of Governors. References in publicaions o he Finance and Economics Discussion Series (oher han acknowledgemen) should be cleared wih he auhor(s) o proec he enaive characer of hese papers.
2 The U.S. Treasury Yield Curve: 1961 o he Presen * Refe S. Gürkaynak Brian Sack and Jonahan H. Wrigh ** June 6 Absrac The discoun funcion, which deermines he value of all fuure nominal paymens, is he mos basic building block of finance and is usually inferred from he Treasury yield curve. I is herefore surprising ha researchers and praciioners do no have available o hem a long hisory of highfrequency yield curve esimaes. This paper fills ha void by making public he Treasury yield curve esimaes of he Federal Reserve Board a a daily frequency from 1961 o he presen. We use a wellknown and simple smoohing mehod ha is shown o fi he daa very well. The resuling esimaes can be used o compue yields or forward raes for any horizon. We hope ha he daa, which are posed on he websie hp://www.federalreserve.gov/pubs/feds/6 and which will be updaed periodically, will provide a benchmark yield curve ha will be useful o applied economiss. * We are graeful o Oliver Levine for superlaive research assisance and o Brian Madigan, Vincen Reinhar and Jennifer Roush for helpful commens. All remaining errors are our own. All of he auhors were involved in yield curve esimaion a he Federal Reserve Board when working a ha insiuion. The views expressed in his paper are solely he responsibiliy of he auhors and should no be inerpreed as reflecing he views of he Board of Governors of he Federal Reserve Sysem or of any oher employee of he Federal Reserve Sysem. ** Gürkaynak: Deparmen of Economics, Bilken Universiy, 68 Ankara, Turkey; Sack: Macroeconomic Advisers, LLC, Washingon DC 6; Wrigh: Federal Reserve Board, Washingon DC 551; () ;
3 1. Inroducion The U.S. Treasury yield curve is of remendous imporance boh in concep and in pracice. From a concepual perspecive, he yield curve deermines he value ha invesors place oday on nominal paymens a all fuure daes a fundamenal deerminan of almos all asse prices and economic decisions. From a pracical perspecive, he U.S. Treasury marke is one of he larges and mos liquid markes in he global financial sysem. In par because of his liquidiy, U.S. Treasuries are exensively used o manage ineres rae risk, o hedge oher ineres rae exposures, and o provide a benchmark for he pricing of oher asses. Wih hese imporan funcions in mind, his paper akes up he issue of properly measuring he U.S. Treasury yield curve. The yield curve ha we measure is an offherun Treasury yield curve based on a large se of ousanding Treasury noes and bonds. We presen daily esimaes of he yield curve from 1961 o 6 for he enire mauriy range spanned by ousanding Treasury securiies. The resuling yield curve can be expressed in erms of zerocoupon yields, par yields, insananeous forward raes, or n bym forward raes (ha is, he myear rae beginning n years ahead) for any n and m. Secion of he paper reviews all of hese fundamenal conceps of he yield curve and demonsraes how hey are relaed o each oher. Secion 3 describes he specific mehodology ha we employ o esimae he yield curve, and Secion 4 discusses our daa and some of he deails of he esimaion. Secion 5 shows he resuls of our esimaion, including an assessmen of he fi of he curve, and secion 6 demonsraes how he esimaed yield curve can be used o calculae he yield on synheic Treasury securiies wih any desired mauriy dae and coupon rae. As an applicaion of his 1
4 approach, we creae a synheic offherun Treasury securiy ha exacly replicaes he paymens of he onherun enyear Treasury noe, allowing us accuraely o measure he liquidiy premium on ha issue. Secion 7 offers some concluding houghs. The daa are posed as an appendix o he paper on he FEDS websie.. Basic Definiions This secion begins by reviewing he fundamenal conceps of he yield curve, including he necessary bond mah. I hen describes he specific esimaion mehod employed in his paper..1 The Discoun Funcion and ZeroCoupon Yields The saring poin for pricing any fixedincome asse is he discoun funcion, or he price of a zerocoupon bond. This represens he value oday o an invesor of a $1 nominal paymen n years hence. We denoe his as d ( n ). The coninuously compounded yield on his zerocoupon bond can be wrien as y ( n) = ln( d ( n))/ n, (1) and conversely he discoun funcion can be wrien in erms of he yield as d ( n) = exp( y ( n) n). () Alhough he coninuously compounded basis may be he simples way o express yields, a widely used convenion is o insead express yields on a couponequivalen or bondequivalen basis, in which case he compounding is assumed o be semiannual insead of coninuous. For zerocoupon securiies, his involves wriing he discoun funcion as
5 d ( n) = 1 ce n (1 + y / ), (3) where ce y is he couponequivalen yield. One can easily verify ha he coninuously compounded yield and he couponequivalen yield are relaed o each oher by he following formula: y ce = ln(1 + y / ). (4) Thus, i is easy o move back and forh beween coninuously compounded and couponequivalen yields. The yield curve shows he yields across a variey of mauriies. Concepually, he easies way o express he curve is in erms of zerocoupon yields (eiher on a coninuously compounded basis or a bondequivalen basis). However, praciioners insead usually focus on couponbearing bonds.. The ParYield Curve Given he discoun funcion, i is sraighforward o price any couponbearing bond by summing he value of is individual paymens. For example, he price of a couponbearing bond ha maures in exacly n years (paying $1) is as follows: n P( n) = ( c/ ) d ( i/ ) + d ( n), (5) i= 1 3
6 where c / is he semiannual coupon paymen on he securiy ha is, i has a saed annual coupon rae of c. 1 Of course, for couponbearing bonds he yield will depend on he coupon raes ha are assumed. One popular way o express he yields on couponbearing bonds is hrough he concep of par yields. A par yield for a paricular mauriy is he coupon rae a which a securiy wih ha mauriy would rade a par (and hence have a couponequivalen yield equal o ha coupon rae). The yield can be deermined from an equaion similar o (5), only seing he price of he securiy equal o $1: n p y ( n) 1 = d ( i /) + d ( n ), (6) i= 1 p where we have replaced he coupon rae wih he variable y ( n ) o denoe he nyear par yield. Solving equaion (6), he par yield is hen given by: y p ( n) = (1 d ( n)). (7) n d (/) i i= 1 The par yields from equaion (7) are expressed on a couponequivalen basis. A coninuously compounded version of his can be derived by assuming a bond pays ou a coninuous coupon rae, in which case he par yield wih mauriy n, y pcc, ( n ), is given by: y pcc, 1 d ( n) ( n) =. (8) n d () i di 1 Because he bond maures in exacly n years, i is assumed o make is coupon paymen oday. Thus, he endofday price of he bond includes no accrued ineres. We will have o address accrued ineres in he pricing of individual Treasury securiies below. For simpliciy, his formula again assumes ha a coupon paymen has jus been made and he nex coupon is a full coupon period away, so ha here is no accrued ineres. 4
7 Zerocoupon yields are a mahemaically simpler and more fundamenal concep han par yields. However, one advanage of expressing he yield curve in erms of par yields is ha financial marke paricipans ypically quoe he yields on couponbearing bonds. Mos financial commenary focuses on individual Treasury securiies, mos ofen he onherun issues he mos recenly issued securiies a each mauriy. These securiies rade near par (a leas iniially) and have shorer duraion (owing o he posiive coupon) han zerocoupon yields wih he same mauriies. 3 Of course, he choice of wheher o focus on zerocoupon yields or par yields is simply a choice of he manner o presen he yield curve once esimaed; hese are alernaive ways of summarizing he informaion in he discoun funcion. In fac, he yield curve can be used o compue he yield for a securiy wih any specified coupon rae and mauriy dae an approach ha we will use below o analyze individual securiies..3 Forward Raes The yield curve can also be expressed in erms of forward raes raher han yields. A forward rae is he yield ha an invesor would agree o oday o make an invesmen over a specified period in he fuure for myears beginning n years hence. These forward raes can be synhesized from he yield curve. Suppose ha an invesor buys one n+ m year zerocoupon bond and sells d ( n+ m) / d ( n) nyear zerocoupon bonds. Consider he cash flow of his invesor. Today, he invesor pays d ( n+ m) for he bond being bough and receives d ( n+ m) d ( n ) = d ( n + m ) for he bond being sold. These cash d ( n) 3 We inroduce he concep of duraion in secion.4 below. The coupon rae for an onherun issue is se afer he aucion a he highes level a which he securiy rades below par. Because Treasury ses coupons in incremens of 1.5 basis poins, his process leaves he issues rading very near par immediaely afer he aucion. 5
8 flows, of course, cancel ou, so he sraegy does no cos he invesor anyhing oday. Afer n years, he invesor mus pay dn ( + m)/ dn ( ) as he nyear bond maures. Afer a furher m years, he invesor receives $1 as he n+ myear bond maures. Thus, his invesor has effecively arranged oday o buy an myear zerocoupon bond n years hence. The (coninuously compounded) reurn on ha invesmen, deermined by he amoun dn ( + m)/ dn ( ) ha he invesor mus pay a ime n o receive he $1 paymen a ime n+m, is wha we will refer o as he nbym forward rae, or he myear rae beginning n years hence. The forward rae is given by he following formula: 1 d ( n+ m) 1 f( nm, ) = ln( ) = (( n+ my ) ( n+ m) ny( n) ), (9) m d ( n) m wih he las equaliy following from (). Taking he limi of (9) as m goes o zero gives he insananeous forward rae n years ahead, which represens he insananeous reurn for a fuure dae ha an invesor would demand oday: f( n,) = lim m f( n, m) = y( n) + ny ( n) = ln( d( n)), (1) n where he las equaliy again uses equaion (). Noice ha (1) implies ha he yield curve is upward (downward) sloping whenever he insananeous forward rae is above (below) he zerocoupon yield a a given mauriy. One can hink of a erm invesmen oday as a sring of forward rae agreemens over he horizon of he invesmen, and he yield herefore has o equal he average of n hose forward raes. Specifically, from equaion (1), ln( d( n)) = f( x,) dx, and so, from equaion (), he nperiod zerocoupon yield (expressed on a coninuously compounded basis) is given by: 6
9 1 n y( n) = f( x,) dx n. (11) Likewise we can wrie y ( n ) as he average of oneyear coninuously compounded forward raes: 1 n y( n) = Σi= 1 f( i 1,1). (1) n Thus, given a complee range of forward raes, one can calculae he complee yield curve from equaions (11) and (1), or, conversely, given he complee yield curve, one can calculae all he forward raes from equaions (9) and (1). Yields and forward raes are simply alernaive ways of describing he same curve. By using forward raes, we can summarize he yield curve in some poenially more informaive ways. For example, he enyear Treasury yield can be decomposed ino oneyear forward raes over ha enyear horizon. As we will discuss below, nearerm forward raes end o be affeced by moneary policy expecaions and hence cyclical variables, while longererm forwards insead are deermined by facors seen as more persisen or by changes in risk preferences. The enyear yield meshes hese wo ypes of influences ogeher, whereas i may be easier o inerpre ha yield when one considers he nearerm and disan forward raes separaely. Indeed, former Fed Chairman Greenspan ofen parsed he yield curve ino is various forward componens (see for example his February and July 5 Moneary Policy Tesimonies). Similarly, Gürkaynak, Sack, and Swanson (5) frame heir discussion of he responsiveness of he yield curve o macroeconomic news in erms of forward raes, poining o he fac ha disan forward raes appear o respond o incoming daa (which hey associae wih movemens in longerm inflaion expecaions). 7
10 Lasly, one can also compue forward raes for fuure invesmens ha have coupon paymens. A par forward rae is he coupon rae ha one would demand oday o make a $1 invesmen a ime n and o receive back $1 in principal a ime n+m along wih semiannual coupons from ime n+½ o ime n+m, assuming ha n and n+m are p coupon daes. Le f ( nm, ) denoe his nbym par forward rae (expressed wih semiannual compounding). An invesor can synhesize his par forward rae agreemen p by selling one nyear zero coupon bond and buying f ( n, m ) / of n+ 1/, n+ 1,... n+ myear zerocoupon bonds and one more n+m year zerocoupon p bond, where f ( nm, ) is se so as o ensure ha he ne cash flow oday is zero. This implies ha p m f ( n, m) d( n) Σ i= 1d( n+ i/) d( n+ m) =. (13) Solving his equaion gives he formula for he nbym par forward rae: f ( d ( n) d ( n+ m)) ( n, m) =. (14) d ( n+ i/) p m i= 1 Whereas coninuously compounded zerocoupon yields can be wrien as he average of he corresponding coninuously compounded forward raes, as in equaions (11) and (1), we canno simply wrie par yields as averages of he consiuen par forward raes. However, Campbell, Lo and Mackinlay (1997) and Shiller, Campbell and Schoenholz (1983) show, using a loglinear approximaion, ha p 1 ρ n i p y ( n) Σi 1ρ f ( i 1,1) n =, (15) 1 ρ p where ρ = 1/(1 + y ( n)), he analog of equaion (1) for par raes. 8
11 .4 Duraion and Convexiy Before moving on o yield curve modeling and esimaion, we inroduce a couple of key conceps for he yield curve: duraion and convexiy. Duraion is a fundamenal concep in fixedincome analysis. Much of he value of a couponbearing securiy comes from coupon paymens ha are being made before mauriy, so he effecive ime ha invesors mus wai o receive heir money is shorer han he mauriy of he bond. The Macaulay duraion of a bond is a weighed average of he ime ha he invesor mus wai o receive he cash flows on a couponbearing bond (in years): n 1 ic [ ( /) ( )] ( ) i 1 D = d i + nd n. (16) P n = Zerocoupon bonds have duraion equal o he mauriy of he bond, bu couponbearing securiies have shorer duraion. For a given mauriy, he higher he coupon rae is, he shorer he duraion. Closely relaed o his concep is he modified duraion of a bond, D MOD, which is defined as he Macaulay duraion divided by one plus he yield on he bond (assuming semiannual compounding): D D =. (17) + MOD y 1 ce I can be shown ha he derivaive of he log price of a bond wih respec o is yield is simply DMOD. Thus, modified duraion provides he sensiiviy (in percen) of he value of a bond o small changes in is yield. A relaed concep is ha of convexiy. Modified duraion measures he sensiiviy of he log price of a bond o changes in yield, bu i is accurae only for small changes in 9
12 yield. The reason i is no accurae for large changes in yield is ha he relaionship beween prices and yields is nonlinear: he capial gain induced by a decline in he yield is larger han he capial loss induced by an equalsized increase in he yield. Convexiy capures his nonlineariy. To a secondorder approximaion, he change in he log price of he bond is given by: 1 dlog( P) D dy ( dy) = mod + κ, (18) 1 d P where κ = is he convexiy of he bond. Convexiy has implicaions for he shape P dy of he yield curve ha will be an imporan consideraion in he choice of our mehodology for esimaing he yield curve. In paricular, convexiy ends o pull down longererm yields and forward raes, an effec ha increases wih uncerainy abou changes in yields. Consider, for example, an increase in he uncerainy abou a longerm ineres rae ha is symmeric in erms of he possible basispoin increase or decrease in yield. For a given level of he yield, his ends o increase he expeced oneperiod reurn on he bond because of he asymmery noed above ha he capial gain from a fall in he yield is greaer han he capial loss from a rise in he yield. Formally, consider he expeced value of he nperiod zerocoupon bond one period ahead, which we can wrie as E[ d+ 1( n)] = E[exp( y+ 1( n) n)]. By Jensen's inequaliy, we have: E [ d ( n)] = E [exp( y ( n) n)] > exp( E [ y ( n)] n). (19) In oher words, he expeced value is higher han he value ha would be associaed wih he expeced yield nex period. 1
13 Markes, of course, recognize his effec and incorporae i ino he pricing of he yield curve. In paricular, he convexiy effec ends o push down yields, as invesors recognize he boos o expeced reurn from he convexiy erm and hence are willing o pay more for a given bond. This effec ends o be larger for bonds wih longer mauriies, giving he yield curve a hump shape ha is discussed a greaer lengh below. 3. Yield Curve Esimaion If he Treasury issued a full specrum of zero coupon securiies every day, hen we could simply observe he yield curve and have a complee se of he yields and forward raes described in he previous secion. Tha, unforunaely, is no he case. Treasury has insead issued a limied number of securiies wih differen mauriies and coupons. Hence, we usually have o infer wha he yields would be across he mauriy specrum from he prices of exising securiies. For each dae, we know he prices (and herefore yields) of a number of Treasury securiies wih differen mauriies and coupon paymens. Accouning for he differences in mauriies and coupons is no a problem; he esimaion will simply view couponbearing bonds as baskes of zerocoupon securiies, one for each coupon paymen and he principal paymen (as described above). 4 The more significan problem is he fac ha we do no have securiies a all mauriies. To come up wih yields across he complee mauriy specrum, we have o inerpolae beween he exising securiies. This exercise is wha consiues yield curve esimaion. 4 Coupon securiies simply bundle ogeher all of hese individual paymens. Unbundling hese paymens is precisely he purpose of he Treasury STRIPS program, in which each coupon and he principal can be individually raded. See Sack () for an overview. 11
14 In embarking on his exercise, one is immediaely confroned by an imporan issue: how much flexibiliy o allow in he yield curve. Pu differenly, one has o decide wheher all observed prices of Treasury securiies exacly reflec he same underlying discoun funcion. This is surely no he case: Idiosyncraic issues arise for specific securiies, such as liquidiy premia, hedging demand, demand for deliverabiliy ino fuures conracs, or repo marke specialness (which is ofen relaed o he oher facors). Moreover, some variaion across securiies could arise from bidask spreads and nonsynchronous quoe imes, hough we believe ha hese effecs are quie small in our daa (described below). In any case, i is desirable (and in fac necessary) o impose some srucure on he yield curve o smooh hrough some of his idiosyncraic variaion. However, one can choose differen mehods ha vary in erms of how much flexibiliy is allowed. One can esimae a very flexible yield curve which would fi well in erms of pricing he exising securiies correcly, bu do so wih considerable variabiliy in he forward raes. Or, one could impose more smoohness on he shape of he forward raes while sacrificing some of he fi of he curve. The more flexible approaches end o be splinebased mehods ha involve a large number of esimaed parameers, while he more rigid mehods end o be parameric forms ha involve a smaller number of parameers. The choice in his dimension depends on he purpose ha he yield curve is inended o serve. A rader looking for small pricing anomalies may be very concerned wih how a specific securiy is priced relaive o hose securiies immediaely around i. Suppose, for example, ha he yield curve has a dip in forward raes beginning, say, in year eigh ha is associaed wih he fac ha securiies in ha secor are he cheapeso 1
15 deliver ino he Treasury fuures conrac (an example we will show below). The rader, in assessing he value of an individual securiy in ha secor, would probably wan o incorporae ha facor ino his relaive value assessmen, and hence he would wan o use a yield curve flexible enough o capure his variaion in he forwards. By conras, a macroeconomis may be more ineresed in undersanding he fundamenal deerminans of he yield curve. Because i is difficul o envision a macroeconomic facor ha would produce a brief dip in he forward rae curve eigh years ahead, he may wish o use a more rigid yield curve ha smoohes hrough such variaion. Our primary purpose in esimaing he yield curve is o undersand is fundamenal deerminans such as macroeconomic condiions, moneary policy prospecs, perceived risks, and invesors risk preferences. Considering his purpose, we will employ a parameric yield curve specificaion. As will be seen below, his specificaion will allow for very rich shapes of he forward curve while largely ruling ou variaion resuling from a small number of securiies a a given mauriy. Our approach follows he exension by Svensson (1994) of he funcional form ha was iniially proposed by Nelson and Siegel (1987). The NelsonSiegel approach assumes ha insananeous forward raes n years ahead are characerized by a coninuous funcion wih only four parameers: f ( n,) = β + β exp( n/ τ ) + β ( n/ τ )exp( n/ τ ). () Wih his funcion, insananeous forward raes begin a horizon zero a he level β + β1 and evenually asympoe o he level β. In beween, forward raes can have a hump, wih he magniude and sign of he hump deermined by he parameer β and he locaion of he hump deermined by he parameer τ 1. 13
16 Below we will show some resuls ha allow us o inerpre he shape of he forwards ha resul from his funcional form. Bu a his poin, i is worh making a few noes. We can always inerpre forward raes as having wo componens: expeced fuure shorerm ineres raes and a erm premium. Under NelsonSiegel, he forward raes will end o sar a he curren shorerm rae ha is largely deermined by he curren moneary policy seing (he saring poin), will be governed a inermediaehorizons by expecaions of he business cycle, inflaion, and corresponding moneary policy decisions (he hump), and will end up a a seadysae level (he asympoe). I urns ou, however, ha his yield curve has difficuly fiing he enire erm srucure, especially hose securiies wih mauriies of weny years or more. The reason is convexiy. As discussed in secion above, convexiy ends o pull down he yields on longererm securiies, giving he yield curve a concave shape a longer mauriies (as will be seen below). The NelsonSiegel specificaion, while fiing shorer mauriies quie well, ends o have he forward raes asympoe oo quickly o be able o capure he convexiy effecs a longer mauriies. For ha reason, we insead use he more flexible approach described in Svensson (1994). This approach assumes ha he forward raes are governed by six parameers according o he following funcional form: f ( n,) = β + β exp( n/ τ ) + β ( n/ τ )exp( n/ τ ) + β ( n/ τ )exp( n/ τ ). (1) In effec, his specificaion adds wo new parameers (he las erm in he equaion) ha allow a second hump in he forward rae curve. The yield curve collapses o Nelson Siegel when β 3 is se o zero. However, as we will see below, he yield curve ypically needs a second hump, one ha usually occurs a long mauriies, o capure he convexiy 14
17 effecs in he yield curve. Inegraing hese forward raes gives us he corresponding zerocoupon yields: n n n 1 exp( ) 1 exp( ) 1 exp( ) τ τ n τ n y ( n) = β + β + β [ exp( )] + β [ exp( )], () n n τ n 1 τ τ τ τ 1 1 and from hese yields one can compue he discoun funcion a any horizon. Thus, for a given se of parameers, he Svensson specificaion characerizes he yield curve and discoun funcion a all mauriies. The discoun funcion can hen be used o price any ousanding Treasury securiy wih specific coupon raes and mauriy daes. In esimaing he yield curve, we choose he parameers o minimize he weighed sum of he squared deviaions beween he acual prices of Treasury securiies and he prediced prices. The weighs chosen are he inverse of he duraion of each individual securiy. To a rough approximaion, he deviaion beween he acual and prediced prices of an individual securiy will equal is duraion muliplied by he deviaion beween he acual and prediced yields. Thus, his procedure is approximaely equal o minimizing he (unweighed) sum of he squared deviaions beween he acual and prediced yields on all of he securiies. Of course, his is jus one of many specificaions ha we could have chosen. A number of oher papers insead use splinebased mehods, including Fisher, Nychka, and Zervos (1995), Waggoner (1997), and McCulloch (1975, 199). These mehods generally allow for more variaion in he forward rae curve (hough he degree of flexibiliy can be conrolled in he specificaions). However, ha flexibiliy may come wih some coss. Bliss (1996) compares a number of esimaion mehods and finds ha parsimonious specificaions such as he NelsonSiegel mehod perform favorably relaive 15
18 o some of he more flexible mehods. In addiion, Sack () demonsraes some of he esimaion difficulies ha can arise under more flexible approaches for esimaing he U.S. erm srucure. 4. Daa and Esimaion Issues We employ he Svensson mehodology for esimaing our benchmark yield curve. In our view, his mehod srikes an appealing balance beween being flexible enough o fi he U.S. yield curve well and being parsimonious enough o avoid overfiing he idiosyncraic variaion in he yields of individual securiies. As described above, we esimae he six parameers, using maximum likelihood, o minimize he sum of he squared deviaions beween he acual prices of Treasury securiies and he prediced prices, where he prices are weighed by he inverse of he duraion of he securiies. Our underlying quoes on Treasury securiies come from wo primary sources. For he period from 14 June 1961 o he end of November 1987, we rely on he CRSP daily Treasury file, which provides endofday quoes on all ousanding Treasury securiies. Since December 1987, we use Treasury quoes provided by he Federal Reserve Bank of New York (FRBNY), which is a proprieary daabase consruced from several sources of marke informaion. 5 An immediae issue ha arises is deermining he se of securiies o be included in he esimaion. The Treasury securiies ousanding a any poin in ime can differ in many dimensions, including heir liquidiy and heir callable feaures. Our goal is o use a se of securiies ha are similar in erms of heir liquidiy and ha do no have special 5 We are no permied o release eiher he underlying CRSP daa or he FRBNY daa. 16
19 feaures (such as being callable) ha would affec heir prices. In oher words, we would ideally have securiies ha only differ in erms of heir coupons and mauriies. To ha end, we include in he esimaion all ousanding Treasury noes and bonds, wih he following excepions: (i) We exclude all securiies wih opionlike feaures, including callable bonds and flower bonds. 6 (ii) We exclude all securiies wih less han hree monhs o mauriy, since he yields on hese securiies ofen seem o behave oddly. This behavior may parly reflec he lack of liquidiy for hose issues and segmened demand for shorerm securiies by paricular invesor classes. (iii) We also exclude all Treasury bills ou of concern abou segmened markes. Indeed, Duffee (1996) showed ha bill raes are ofen disconneced from he res of he Treasury yield curve, perhaps owing o segmened demand from money marke funds and oher shorerm invesors. (iv) We begin o exclude wenyyear bonds in 1996, because hose securiies ofen appeared cheap relaive o enyear noes wih comparable duraion. This cheapness could reflec heir lower liquidiy or he fac ha heir high coupon raes made hem unaracive o hold for axrelaed reasons. 7 (v) We exclude he wo mos recenly issued securiies wih mauriies of wo, hree, four, five, seven, en, weny, and hiry years for securiies issued in 198 or laer. These are he onherun and firs offherun issues ha ofen rade a a premium o 6 Flower bonds were securiies wih low coupons ha could be redeemed a par for he paymen of esae axes. 7 To avoid an abrup change o he sample, we allow heir weighs o linearly decay from 1 o over he year ending on January,
20 oher Treasury securiies, owing o heir greaer liquidiy and heir frequen specialness in he repo marke. 8 Earlier in he sample, he concep of an onherun issue was no well defined, since he Treasury did no conduc regular aucions and he repo marke was no well developed (as discussed by Garbade (4)). Our cuoff poin for excluding onherun and firs offherun issues is somewha arbirary bu is a conservaive choice (in he sense of poenially erring on he side of being oo early). (vi) Oher issues ha we judgmenally exclude on an ad hoc basis. For example, here were large and persisen failsodeliver in he May 13 3⅝ percen enyear noe, well afer i ceased o be eiher he onherun or firs offherun enyear securiy. Wih he securiy persisenly rading around he fails rae in he overnigh repo marke, he yield on he securiy in he cash marke was driven down. Thus, we dropped he securiy for some ime o avoid having our yield curve disored by he idiosyncraic dislocaion of his issue. These resricions imply ha we are esimaing an offherun Treasury yield curve, one for which he liquidiy of he included securiies should be relaively uniform. The liquidiy implici in our curve should be regarded as adequae, hough far shor of he remarkable liquidiy of onherun issues. The ranges of mauriies available for esimaion over our sample are shown graphically in Figure 1, which akes he same form as a figure repored by Bliss (1996). The dae is shown on he horizonal axis, he remaining mauriy is shown on he verical axis, and each ousanding Treasury coupon securiy is represened by a do showing is 8 Some simple saisics on rading volume highligh jus how differen he onherun issues are from oher Treasury issues. According o Sack and Elsasser (4), he weekly urnover rae for offherun Treasury securiies in 3 (ha is, weekly rading volume as a percen of ousanding deb) was abou percen, while i was a remarkable 14% for onherun issues. 18
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