question about proc mixed output

[superbug]

Hello proc mixed experts,

Variables in my data are ID, itemduration(time spent answering each question), difficulty(item difficulty). each ID anwer 150 questions, that is, row 1-row 150 are the same ID, row 151-row 300 are the same ID, etc.

 I used the following code to model the data

proc mixed data= try method=ml;
 class ID;
 model itemduration = difficulty / solution outp=t;
 random intercept difficulty / subject=ID type=un g solution;
 ods output solutionR=randest;
run; 

the following is portion of the output data "randest", I can't understand why "std Err Pred" are the same for all IDs. I am trying to get standard errors for each ID. How should I edit the code so that I can get standard errors for each ID?

Thank you for any help.

[SASJedi]

Moved to Stat Procs for better visibility.

[jiltao]

Hi  superbug,

This seems to be the same question you posted earlier. Please see this thread  -

https://communities.sas.com/t5/Statistical-Procedures/proc-mixed-multilevel-output/m-p/716716/highli...

Jill