Re: Repeated contrast for COXREG

Posted by Bruce Weaver on Jan 04, 2022; 6:41pm
URL: http://spssx-discussion.165.s1.nabble.com/Repeated-contrast-for-COXREG-tp5740927p5740932.html

Hello Kirill.  I was using the terminology I found in the article I cited.  But I see that other resources use notation & terminology more in line with yours.  E.g.,

https://bookdown.org/pingapang9/linear_models_bookdown/chap-contrasts.html#connection-between-contrast-and-coding-schemes

Cheers,
Bruce

Kirill Orlov wrote

Bruce,
The first matrix is contrast coefficient (L) matrix.
The second matrix is the coding (C) matrix, i.e. values of the design matrix.

They are related as the ginv() of each other (but not so for all types of contrasts).
I discuss this in the description of my macro "Categorical into contrast" !KO_CATCONT which produces predictor variables for various contrast types. You could download from my page https://www.spsstools.net/en/macros/KO-spssmacros/