Chi square. Response Vowel in Response Choice # of Observed # of Expected Choices Responses Responses


 Dulcie Chapman
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1 Chi square Chisquare uses categorical data. It looks at how many things fall into different categories, and calculates whether the probability of obtaining those count is significantly different from random. Example: Number of responses on a multiple choice test. Jill loves the taste of coffee. If she were able to she would all her food so it tasted like coffee. Response Vowel in Response Choice # of Observed # of Expected Choices Responses Responses c[ ]ffify Vowel not found in coffee or caffeine c[ ɑ]ffify Vowel found in coffee c[æ]ffify Vowel found in caffeine Is 186, 113, 70 really different from what random choice would give ( i.e. 123, 123, 123)? Chisquare produces two numbers, a Χ 2 value and a p value. The data we are considering yield a Χ 2 of and a p value of The small p value indicates that the chances of getting the 70, 113, 186 distribution by chance is extremely unlikely, so it must be due to something else besides chance.
2 To analyze the 1 x 3 coffee/caffeine data: Specify the dependent variable: Click on Data > Weight Cases. Click on Weight Cases by then on the VowelCount variable in the lefthand window. Click on the arrow to move it to the box under Frequency Variable > OK (Figure 4.3). Figure 4.3. Weight Cases dialog box.
3 Carry out the Chisquare: Click on Analyze > Nonparametric Tests > Legacy Dialogs > Chi Square (Figure 4.4). Figure 4.4. Finding the Chisquare menu.
4 Move Vowel to Test Variable List by clicking on Vowel then on the arrow between the boxes > OK (Figure 4.5). Figure 4.5. Chisquare dialog box.
5 SPSS produces the data in Table 4.2. (Disregard the error about the weight value. SPSS just doesn't like the fact that the data columns in the spreadsheet don't have equal numbers of rows.) Table 4.2. SPSS Chisquare output for the coffee/caffeine study. Vowel Test Statistics Observed N Expected N Residual Vowel c^ffify ChiSquare cahffify df 2 caeffify Asymp.Sig..000 Total 369
6 Example problem: In Linguistics courses the enrollments are 300 men and 75 women. Are men more likely to study linguistics than women? (Check in calculator.) Problem: 60% men and 40% women in university. What are the expected enrollments with 375 students? (Use calculator that lets you put in expected by hand.) What are the output of a chisquare test? X 2 when high indicates that the numbers in each category are not obtainable by random distribution. Degrees of freedom (df) are needed to interpret X 2. The degrees of freedom are the number of rows minus one, plus the number or columns minus one. So in a 3 by 2 table df =(31)+(21)=3 How do you report these numbers? If Chisquare is 99.56, df=4, and p is smaller than 0.05 then: X 2 (4) = 99.56, p < 0.05.
7 The research question is whether snuck, the irregular past tense of sneak, is an Americanism. In other words, what is the effect of the variety of English on the use of snuck versus sneaked. The data in Table 4.3 come from the British National Corpus (BNC) and the Corpus of Contemporary American English (COCA). 1 Table 4.3. Frequencies of sneaked and snuck in COCA and the BNC. COCA BNC sneaked snuck As you can see, there are quite a few more cases of both variants of the past tense of sneak in COCA. This is not surprising since COCA is about four and a half times as large as the BNC. However, there is no need to compensate for the size difference between the corpora since we are comparing each of the two extant past tenses across corpora. If, on the other hand, we were asking if snuck is used more in COCA compared to the BNC (896 and 10 instances), that would be put in a 1 x 2 table, where COCA would surely have more instances given its larger size. 2 Considering both variants across corpora is preferred. In any event, the Chisquare on these data comes out significant (Χ 2 (2) = 94.50, p <.0005), but what exactly is significant? To answer this, it is important to compare the observed scores with the expected scores that the program calculates. (The expected scores in a two dimensional table like this is not calculated by dividing the sum of the counts in the cells by the number of cells. I forgo explaining exactly how the calculations are made in order to keep my promise of keeping the math to the 1 Corpus.byu.edu 2 In this case, the data from each corpus would need to be equalized to compensate for the differences in corpus size. One way to achieve this would be to compare how often each word occurs per million in each corpus. Since Chisquare requires counts never proportions or percentages, the per million numbers 1.82 and.1 (COCA and BNC) can't be used. However, multiplying each by 10 and rounding to whole numbers yields 18 and 1 which could be compared in a Chisquare.
8 minimum. Let the computer do it for you.) In Table 4.4, large boldface numbers indicate observed counts that are larger than expected counts. Small fonts, on the other hand show counts that are smaller than expected. Therefore, sneaked does appear to be significantly more British and snuck more American. Table 4.4. Observed and expected frequencies of sneaked and snuck in COCA and the BNC. Observed Expected COCA BNC COCA BNC sneaked snuck Chisquare answers the question: Do the observed counts differ significantly from what would be expected by chance? However, it does not give any sense of which cells in the table were most influential nor what the degree of association between the variables is. That is, it doesn't answer the question: How strongly related are the uses of sneaked and snuck to British or American English? This is where Cramer's V is helpful. It measures strength of relationship on a 0 to 1 scale where 0 indicates no relationship and numbers close to 1 an extremely strong one. In the case of sneaked and snuck the Cramer's V is fairly weak at.233 so the relationship between the different past tense forms and the variety of English is not very strong. Determining which cells account for most of the significance of the chisquare is a matter of looking at the standard residual for each cell in Table 4.5. Observations with standardized residuals that are 1.96 or higher or or lower fit this bill at the.05 level, while the more stringent +/2.58 corresponds with the.01 level of significance. As far as sneaked and snuck are concerned, it is the difference between those two past tense forms in the BNC (6.5, 6.8) that is most responsible for the
9 significant chisquare. The standardized residuals from COCA don't reach significance.
10 Using SPSS to Calculate a 2 x 2 Chisquare Specify the dependent variable: Click on Data > Weight Cases. Click on Weight Cases by then on the CorpusCount variable in the lefthand window. Click on the arrow to move it to the box under Frequency Variable > OK. Carry out the Chi square: Click on Analyze > Descriptives > Crosstabs. Move Corpus into Row(s) and Answer into Column(s). Click on Cells, check Observed, Expected, Standardized > Continue (Figure 4.6). Figure 4.6. Crosstabs dialog box.
11 Click on Statistics, choose Chisquare and Phi and Cramer's V > Continue > OK (Figure 4.7). Figure 4.7. Crosstabs Statistics dialog box.
12 SPSS generates the data in Tables 4.5, 4.6 and 4.7: Table 4.5. SPSS table of observed and expected frequencies for the sneaked/snuck study. Corpus * Answer Crosstabulation Answer Total sneaked snuck Corpus BNC Count Expected Count Std. Residual COCA Count Expected Count Std. Residual Total Count Expected Count Table 4.6. SPSS Chisquare output for the sneaked/snuck study. ChiSquare Tests Value df Asymp. Sig. (2sided) Pearson ChiSquare a Continuity Correction b Likelihood Ratio Exact Sig. (2 sided) Exact Sig. (1 sided) Fisher's Exact Test LinearbyLinear Association N of Valid Cases a. 0 cells (0.0%) have expected count less than 5. The minimum expected count is b. Computed only for a 2x2 table
13 Table 4.7. SPSS Chisquare measures of association for the sneaked/snuck study. Symmetric Measures Value Approx. Sig. Nominal by Nominal Phi Cramer's V N of Valid Cases 1900 Assumptions of Chisquare Since Chisquare is not a parametric statistic the data do not need to follow a regular distribution. However, the observations must be independent of each other. In an experiment this would mean that one person can only give one answer. In the sneaked/snuck study this means that the data can only come from one corpus, not both. Studies that test people at two different points in time shouldn't be analyzed with Chisquare because they would violate independence. The numbers in a Chisquare analysis must also be whole number counts, never percentages or proportions or you will have your hand slapped. Furthermore, the expected value in each cell must be at least five. What if the expected value is less than five? Look back at the bottom Table 4.6. For that particular Chisquare it indicates that 0 cells (0.0%) have expected count less than 5 so we are safe using Chisquare. However, if there were cells with fewer than five expected counts, we could use a FISHER'S EXACT TEST instead. The p value for the Fisher's appears in Table 4.6 and has a p value of. 000 (read.0005). Note that SPSS does not give Fisher's a value nor a degrees of freedom, just a p value.
14 Hands on exercises for Chi square Judeo Spanish Sibilant voicing At an earlier stage in its history, Spanish distinguished between /s/ and /z/ in words such as [kaza] house and [kasa] hunt. Later, [s] and [z] merged into [s] making house and hunt homophones: [kasa]. However, in Judeo Spanish these two phones are thought to remain distinct. To test this hypothesis Bradley and Delforge (2006) recorded a Judeo Spanish speaker saying 72 words that historically had [s], and another 72 that historically had [z]. They analyzed the words and categorized the pronunciations as either voiced, partially voiced, or voiceless. Their results appear in Table X. Table 4.8. Results of Bradley and Delforge's (2006) study on sibilant voicing in a Judeo Spanish speaker. Historically voiceless /s/ Historically voiced /z/ # of voiceless realizations 49 2 # of partially voiced realizations 6 6 # of fully voiced realizations Enter the data in Table 4.8 into SPSS. These data result in a 2 x 3 Chisquare. 2 Follow the above instructions for performing a 2 x 2 analysis and perform a Chisquare in SPSS. 3 Examine the observed counts of voiced, partially voiced, and voiceless pronunciations. Compare them with the expected counts SPSS calculates. How do they help prove or disprove Bradley and Delforge's hypothesis? 4 Are the results significant? 5 What does the Cramer's V statistic tell you?
15 6 What do the standardized residuals tell you? 7 How would you report the results of this Chisquare in standard format? 8 Does this analysis meet the assumptions of Chisquare? /r/ to /R/ in Canadian French Canadian French is undergoing a change from /r/ to /R/ (Sankoff and Blondeau 2007). Speakers who retain [r] are considered traditionalist speakers, while speakers who use /R/ are early adopters. They claim that eight of ten early adopters are female; and seven of ten traditionalists are male, a statistically significant difference. (571) 1 Enter these data into SPSS. 2 What is the research question the data intend to answer? 3 What statistical analysis is appropriate for these data? Why? 4 Are the results significant? 5 What does Cramer's V and the standardized residuals tell you? 6 How would you report the results of this analysis?
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