topic Kappa proc freq in Statistical Procedures

Kappa proc freq

PSIOT2 — Tue, 04 Mar 2025 11:20:22 GMT

Dear all,

I would like to compare two kappas using proc freq but no kappa and p-value are displayed with no mentioning error in the log.

The goal is to compare two kappa calculated for two different way to read a scan. We ask to 4 different readers to localize a lesion with te two modalities.

Please find my code:

proc freq data=allMalignantCases;
table arm_id*reader*location / agree ;
test kappa;
run;

Only tables of distribution are displayed.

Thank you

Re: Kappa proc freq

PSIOT2 — Tue, 04 Mar 2025 13:16:40 GMT

To be complete with my previous message, there are 5 possible locations, 4 readers and two modalities of reading.

Re: Kappa proc freq

Rick_SAS — Tue, 04 Mar 2025 14:49:10 GMT

What are the dimensions of the tables? The documentation for the KAPPA statistic states:
"Kappa coefficients are defined only for square tables, where the number of rows equals the number of columns. PROC FREQ does not compute kappa coefficients for tables that are not square"
See SAS Help Center: TEST Statement'

Re: Kappa proc freq

Ksharp — Wed, 05 Mar 2025 06:19:31 GMT

Also check sas built-in macro %MAGREE .
There are Kappa statistics you need in it.
https://support.sas.com/kb/25/006.html

Re: Kappa proc freq

PSIOT2 — Mon, 10 Mar 2025 06:35:31 GMT

Thank you all, indeed my matrix is not squared and cmh2 works.