In PROC GLIMMIX if you specify a RANDOM _RESIDUAL_ statement to a G-side model with DIST=BYOBS, then a read-access violation might result. For example with a model like,

  proc glimmix data=test;
    class id2 id1 dist;
   model response(event="1") = dist dist*x dist*mm /noint s 
                                           dist=byobs(dist);
   random  int/ subject=id2;
   random  int / subject=id1(id2);
   random _residual_;
   run;

then the following error message will appear:

ERROR:  Read Access Violation In Task [ GLIMMIX ]
Exception occurred at (41485817)
Task Traceback
Address   Frame     (DBGHELP API Version 4.0 rev 5)
41485817  076BF378  sasglimm:mcn_main+0x14817
41483C47  076BF3CC  sasglimm:mcn_main+0x12C47
414FAFA6  076BF41C  sasglimm:mcn_main+0x89FA6
41471453  076BFF8C  sasglimm:mcn_main+0x453
015927C8  076BFFA0  sashost:Main+0xC204
0167D038  076BFFB4  sashost:Main+0xF6A74
7C80B713  076BFFEC  kernel32:GetModuleFileNameA+0x1B4

If you remove the RANDOM _RESIDUAL_ statement then PROC GLIMMIX returns incorrect results in the following situation:

• DIST=BYOBS
• Not all component distributions have scale parameters
• Only G-side random effects

One circumvention to this problem is to use METHOD=LAPLACE or QUAD.

A hot fix is being planned for this issue.

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