topic Re: Why does PROC CORR fail to calculate Polychoric correlation in Statistical Procedures

Why does PROC CORR fail to calculate Polychoric correlation

Tiny_Kane — Mon, 15 Sep 2014 20:36:37 GMT

I want to calculate Polychoric correlation by using PROC CORR. My code is

proc corr data=adbttforcfa POLYCHORIC;

var adbtt_dom_1b adbtt_dom_2b adbtt_dom_3b adbtt_dom_4b adbtt_dom_5b adbtt_dom_6b adbtt_dom_7b adbtt_dom_8b;

title 'correlation for items of factor isolated';

run;

But it failed, SAS log showed error message like:

20 proc corr data=adbttforcfa POLYCHORIC;

----------

202

ERROR 22-322: Syntax error, expecting one of the following: ;, (, ALPHA, BEST, COV, CSSCP, DATA, EXCLNPWGT, FISHER, HOEFFDING,

KENDALL, NOCORR, NOMISS, NOPRINT, NOPROB, NOSIMPLE, OUTH, OUTK, OUTP, OUTS, PEARSON, PLOTS, POLYSERIAL, RANK,

SINGULAR, SPEARMAN, SSCP, VARDEF.

ERROR 202-322: The option or parameter is not recognized and will be ignored.

521 var adbtt_dom_1b adbtt_dom_2b adbtt_dom_3b adbtt_dom_4b adbtt_dom_5b adbtt_dom_6b adbtt_dom_7b adbtt_dom_8b;

522 title 'correlation for items of factor isolated';

523 run;

What is the reason?? PROC CORR cannot produce Polychoric correlation?

Re: Why does PROC CORR fail to calculate Polychoric correlation

lvm — Mon, 15 Sep 2014 20:49:58 GMT

What version of SAS are you using? POLYCHORIC definitely works in 9.3 and 9.4. I don't know when it was added (it was not in old version 8).

Re: Why does PROC CORR fail to calculate Polychoric correlation

Tiny_Kane — Mon, 15 Sep 2014 20:52:17 GMT

I am using SAS 9.3.

Re: Why does PROC CORR fail to calculate Polychoric correlation

Tiny_Kane — Mon, 15 Sep 2014 20:52:53 GMT

NOTE: SAS (r) Proprietary Software 9.3 (TS1M1)

Licensed to UNIV OF MASSACHUSETTS MEDICAL SCHOOL - SFA T&R, Site 70118457.

NOTE: This session is executing on the X64_7PRO platform.

Re: Why does PROC CORR fail to calculate Polychoric correlation

lvm — Mon, 15 Sep 2014 20:56:25 GMT

Looks like the option only appeared with STAT 12.1 (or later), which was still part of 9.3. Your version (TS1M1) doesn't have it. I just checked. You will need a newer version of SAS for this.

Re: Why does PROC CORR fail to calculate Polychoric correlation

lvm — Tue, 16 Sep 2014 12:38:01 GMT

But you can get the polychoric correlation using PROC FREQ in older versions of SAS.

Re: Why does PROC CORR fail to calculate Polychoric correlation

Tiny_Kane — Tue, 16 Sep 2014 17:09:16 GMT

Hi~ Proc freq can give me polychoric correlation. However, I have more than two variables, therefore I want to get a correlation matrix...But it seems like PROC FREQ cannot make the matrix...Do you have any idea to solve it? Thank you in advance!

Re: Why does PROC CORR fail to calculate Polychoric correlation

lvm — Tue, 16 Sep 2014 17:56:45 GMT

You can try the old sas macro for polychoric correlations. Never used it, so you would be on your own.

http://support.sas.com/kb/25/010.html

Re: Why does PROC CORR fail to calculate Polychoric correlation

Tiny_Kane — Tue, 16 Sep 2014 19:47:37 GMT

Thanks!