Re: No chi-square value in McNemar test output?

Posted by Bruce Weaver on Jun 08, 2016; 3:59pm
URL: http://spssx-discussion.165.s1.nabble.com/No-chi-square-value-in-McNemar-test-output-tp1080750p5732351.html

Marta has posted a macro you can use.  Here is another option you could use if all you want is the Chi-square value and its p-value.

* McNemar's Chi-square is equivalent to a Chi-square
* goodness of fit test (using Pearson's Chi-square)
* on the two discordant cells, which I'll call b and c.

DATA LIST LIST /b c (2F5.0).
BEGIN DATA
12 4
END DATA.

* For both cells, the expected frequency under the null hypothesis
* is the mean of the two observed counts.

COMPUTE E = MEAN(b,c).
COMPUTE Xsq1 = (b-E)**2/E + (c-E)**2/E.
COMPUTE Xsq2 = (ABS(b-E)-.5)**2/E + (ABS(c-E)-.5)**2/E.
COMPUTE df = 1.
COMPUTE p1 = 1 - CDF.CHISQ(Xsq1,df).
COMPUTE p2 = 1 - CDF.CHISQ(Xsq2,df).
FORMATS Xsq1 Xsq2 p1 p2 (F8.3) / df (F5.0).
LIST.

List

    b     c        E     Xsq1     Xsq2    df       p1       p2

   12     4     8.00    4.000    3.063     1     .046     .080

Number of cases read:  1    Number of cases listed:  1

* Xsq1 and Xsq2 are the uncorrected and continuity-corrected
* versions respectively of McNemar's Chi-square test.

Results from Marta's macro:

MyMcNemar 10 12 4 20.

MCNEMAR CHI-SQUARE TESTS AND RELATED STATISTICS
CHI-SQUARE TESTS (ASYMPTOTIC)
           Stat.     Sig.
Uncorr.    4.000     .046
Corr.      3.063     .080

MCNEMAR'S ODDS-RATIO & 95CI (ASYMPTOTIC)
       OR    Lower    Upper
      .33      .11     1.03


HTH.

Sytske wrote

Dear all,

I’m using the nonparametric 2 related samples McNemar test in SPSS 15 (NPAR
TEST), but the output doesn’t give me a value for the McNemar chi-square.
The output gives the crosstab plus a table containing ‘N’ and ‘Exact Sig.
(2-tailed)’. Why is SPSS not giving the chi-square and how can I get the
chi-square?

Thank you very much for your help!

Sytske

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