Rather than the Spearmann (ordinal) correlation, it is more appropriate to

apply the Pearson (linear) correlation, which is itself closely related to

chi square. The Pearson correlation for two binary variables is equivalent

to the phi coefficient, which is itself defined as chi square divided as the

square root of (X2/n) where X2 stands for chi square, and n is sample size.

Notice also that the percentage difference for one variable between values

of the other variable equals the corresponding regression coefficients. For

instance, if X=sex (0=male, 1=female) and Y=some Yes-No question, and the

Yes percentage is 50% for men and 80% for women, the regression equation

would be Yes=0.50 + 0.30(Sex).

Hector

-----Mensaje original-----

De: SPSSX(r) Discussion [mailto:

[hidden email]] En nombre de iheb

bougmiza

Enviado el: Thursday, June 22, 2006 11:31 AM

Para:

[hidden email]
Asunto: Spearman correlation

Dear list

Can we calculate the spearman correlation between 4 binary variables coded

in 0 and 1 rather than the chi 2 test ? Wich is better ?

Thanks

M. Iheb BOUGMIZA

Adresse: 90, Rue de l'Ourcq, Bat B. 75019 Paris

Tél : 06 98 82 36 53

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