topic PROC GENMOD Warning in SAS Programming

PROC GENMOD Warning

MerAgSo — Thu, 24 Jan 2019 21:29:00 GMT

Hi,

I am trying to run a PROC GENMOD but I get this warning:

Some rows of the L matrix for the CONTRAST statement LRT are linearly dependent. Those rows will be ignored.

I've tried reading what this means but I can't find it.

I am a begginer in SAS.

Thank you

Re: PROC GENMOD Warning

ChrisNZ — Fri, 25 Jan 2019 01:45:08 GMT

Please provide the code used for procedure call and the full log for that code.

Re: PROC GENMOD Warning

MerAgSo — Fri, 25 Jan 2019 21:16:50 GMT

*Code*
PROC GENMOD DATA= QUARTILESIMP;

CLASS NEWQUART2(REF='0') SMOKE(REF='Never') SITIO(REF='Monterrey')
IND(REF='0') / param=effect;

MODEL LIMT= NEWQUART2 EDADM TOTMET08 SITIO SES2 SMOKE IND

NEWQUART2*IND/ link=identity TYPE3;

CONTRAST 'LRT'

NEWQUART2*IND 1 1,

NEWQUART2*IND 2 1,

NEWQUART2*IND 3 1;

RUN; TITLE;

Log;

NOTE: PROC GENMOD is modeling the probability that SCVD2='1'.
NOTE: The Pearson chi-square and deviance are not computed since the
AGGREGATE option is not specified.
NOTE: Algorithm converged.
NOTE: The scale parameter was held fixed.
WARNING: Some rows of the L matrix for the CONTRAST statement LRT are
linearly dependent. These rows will be ignored.
NOTE: The PROCEDURE GENMOD printed pages 282-283.
NOTE: PROCEDURE GENMOD used (Total process time):
real time 0.12 seconds
cpu time 0.13 seconds