error with proc mianalyze with multinomial logistic regression

estul — Thu, 15 Feb 2018 00:22:55 GMT

Hello all,

Currently trying to get pooled results for my multipley imputed and bootstrapped data for a multinomial regression (see code below), but I get the error "ERROR: Within-imputation COV matrix is not symmetric for _Imputation_= 1 in the input DATA= data set" when I run my Proc MIANALYZE step. It doesn't seem that my variable names are too long in character so I don't think that's the issue. Any guidance on how to trouble-shoot would be much appreciated. I have been using the code described on MI for multinomial (nominal) logistic regression here: http://support.sas.com/kb/49/579.html.

Thanks!

Code:

/*CRUDE MODEL*/
PROC LOGISTIC DATA= final.out_ipw_all outest = final.parms covout descending;
BY _imputation_ replicate;
WHERE sp2=1;
CLASS style(REF='2') income(REF='1') / PARAM=REF;
MODEL style=income/ link = glogit;
WEIGHT ipw_trim;
ODS OUTPUT ParameterEstimates=final.out_crude;
RUN;

/*proc mianalyze*/
proc mianalyze data = final.parms edf = 550;
modeleffects income2_3 income2_1 income3_3 income3_1 intercept_1 intercept_3;
run;

Re: error with proc mianalyze with multinomial logistic regression

SAS_Rob — Thu, 15 Feb 2018 13:08:33 GMT

I suspect it has something to do with the BY statement in Proc LOGISTIC. I noticed that you are not only doing it BY _IMPUTATION_ but also REPLICATE. You would need a corresponding BY statement in MIANALYZE to take into account that second variable.

topic error with proc mianalyze with multinomial logistic regression in Statistical Procedures

error with proc mianalyze with multinomial logistic regression

Re: error with proc mianalyze with multinomial logistic regression