Hi Reeza, I was able to perfrom multivariable analysis once I removed ODDSRATIO statemtn. It gave me exact estimates. Thanks ... View more

Thanks. ... View more

As I mentioned earlier, it did not work. Here is the log:   161  proc logistic data=pe.matchedata_21 desc; NOTE: Data file PE.MATCHEDATA_21.DATA is in a format that is native to another host, or       the file encoding does not match the session encoding. Cross Environment Data       Access will be used, which might require additional CPU resources and might reduce       performance. 162  strata group; NOTE: PROCEDURE LOGISTIC used (Total process time):       real time           0.01 seconds       cpu time            0.01 seconds NOTE: The SAS System stopped processing this step because of errors. 163  class CMV_ca_2_1 (ref='Absent') bmicat (ref='Less than 25')/param=ref; 164  format CMV_ca_2_1 CMV_igg. bmicat bmicat.; 165  model PEstatus (event='1')= CMV_ca_2_1 bmicat; 166  exact CMV_ca_2_1 bmicat / estimate = both; 167  oddsratio cmv_ca_2_1 bmicat;                           ------                           22                           202 ERROR 22-322: Syntax error, expecting one of the following: ;, /. ERROR 202-322: The option or parameter is not recognized and will be ignored. 168  run; ... View more

This is the same I posted in previous message. It is here again.   proc logistic data=pe.matchedata_21 desc; strata group; class CMV_ca_2_1 (ref='Absent')/param=ref bmicat (ref='Less than 25')/param=ref; format CMV_ca_2_1 CMV_igg. bmicat bmicat.; model PEstatus (event='1')= CMV_ca_2_1 bmicat; exact CMV_ca_2_1 bmicat / estimate = both; oddsratio cmv_ca_2_1 bmicat; run;   153  proc logistic data=pe.matchedata_21 desc; NOTE: Data file PE.MATCHEDATA_21.DATA is in a format that is native to another host, or       the file encoding does not match the session encoding. Cross Environment Data       Access will be used, which might require additional CPU resources and might reduce       performance. NOTE: PROCEDURE LOGISTIC used (Total process time):       real time           0.01 seconds       cpu time            0.01 seconds NOTE: The SAS System stopped processing this step because of errors. 154  strata group; 155  class CMV_ca_2_1 (ref='Absent')/param=ref bmicat (ref='Less than 25')/param=ref;                                                ------                                                22                                                76 ERROR 22-322: Syntax error, expecting one of the following: ;, CODING, CPREFIX, DESC,               DESCENDING, LPREFIX, MISSING, ORDER, PARAM, REF, REFERENCE, TRUNCATE. ERROR 76-322: Syntax error, statement will be ignored. 156  format CMV_ca_2_1 CMV_igg. bmicat bmicat.; 157  model PEstatus (event='1')= CMV_ca_2_1 bmicat; 158  exact CMV_ca_2_1 bmicat / estimate = both; 159  oddsratio cmv_ca_2_1 bmicat; 160  run; ... View more

It did not change putting Param=ref once.   Problem remians the same. ... View more

Hi again Reeza, As I start buidling multivariable model it again creates problem. Here are my codes and logs, once again thanks for your help.   proc logistic data=pe.matchedata_21 desc; strata group; class CMV_ca_2_1 (ref='Absent')/param=ref bmicat (ref='Less than 25')/param=ref; format CMV_ca_2_1 CMV_igg. bmicat bmicat.; model PEstatus (event='1')= CMV_ca_2_1 bmicat; exact CMV_ca_2_1 bmicat / estimate = both; oddsratio cmv_ca_2_1 bmicat; run; 153  proc logistic data=pe.matchedata_21 desc; NOTE: Data file PE.MATCHEDATA_21.DATA is in a format that is native to another host, or       the file encoding does not match the session encoding. Cross Environment Data       Access will be used, which might require additional CPU resources and might reduce       performance. NOTE: PROCEDURE LOGISTIC used (Total process time):       real time           0.01 seconds       cpu time            0.01 seconds NOTE: The SAS System stopped processing this step because of errors. 154  strata group; 155  class CMV_ca_2_1 (ref='Absent')/param=ref bmicat (ref='Less than 25')/param=ref;                                                ------                                                22                                                76 ERROR 22-322: Syntax error, expecting one of the following: ;, CODING, CPREFIX, DESC,               DESCENDING, LPREFIX, MISSING, ORDER, PARAM, REF, REFERENCE, TRUNCATE. ERROR 76-322: Syntax error, statement will be ignored. 156  format CMV_ca_2_1 CMV_igg. bmicat bmicat.; 157  model PEstatus (event='1')= CMV_ca_2_1 bmicat; 158  exact CMV_ca_2_1 bmicat / estimate = both; 159  oddsratio cmv_ca_2_1 bmicat; 160  run; ... View more

Thanks Reeza; it worked this time. Both tables are below, exact and non-exact analysis. My question is that why we use exact when we get wide 95%CI, usually we prefer narrow CI. Exact Odds Ratios Parameter   Estimate 95% Confidence Limits Two-sided p-Value CMV_ca_2_1 Present 2.386 0.252 30.852 0.6250               Odds Ratio Estimates Effect Point Estimate 95% Wald Confidence Limits CMV_ca_2_1 Present vs Absent 2.386 0.374 15.232 ... View more

My apologies!   81   proc logistic data=pe.matchedata_21 desc; NOTE: Data file PE.MATCHEDATA_21.DATA is in a format that is native to another host, or       the file encoding does not match the session encoding. Cross Environment Data       Access will be used, which might require additional CPU resources and might reduce       performance. 82   strata group; 83   class CMV_ca_2_1 (ref='Absent'); 84   format CMV_ca_2_1 CMV_igg.; 85   model PEstatus (event='1')= CMV_ca_2_1; 86   exact CMV_ca_2_1 / estimate = both; 87   oddsratio cmv_ca_2_1; 88   run; NOTE: Writing HTML Body file: sashtml1.htm NOTE: PROC LOGISTIC is modeling the probability that PEstatus='1'. NOTE: Convergence criterion (GCONV=1E-8) satisfied. WARNING: Odds ratios for CMV_ca_2_1 in the EXACT statement are not computed unless the          reference parameterization is used. NOTE: There were 73 observations read from the data set PE.MATCHEDATA_21. NOTE: PROCEDURE LOGISTIC used (Total process time):       real time           2.08 seconds       cpu time            1.37 seconds ... View more

proc logistic data=pe.matchedata_21 desc; strata group; class CMV_ca_2_1 (ref='Absent'); format CMV_ca_2_1 CMV_igg.; model PEstatus (event='1')= CMV_ca_2_1; exact CMV_ca_2_1 / estimate = both; oddsratio cmv_ca_2_1; run; Below is the table which I get for Exact analysis after using the above code. PLease note that before this table or exact analysis, the result contains non-exact output with 95%CI (output 1 below). SAS Output 1 Odds Ratio Estimates and Wald Confidence Intervals Odds Ratio Estimate 95% Confidence Limits CMV_ca_2_1 Present vs Absent 2.386 0.374 15.232 SAS Output 2 Exact Parameter Estimates Parameter   Estimate Standard Error 95% Confidence Limits Two-sided p-Value CMV_ca_2_1 Present 0.4348 0.4729 -0.6886 1.7146 0.6250   ... View more

Thanks Reeza. However, it does not work. With 'oddsratio cmv_ca_2_1' no change. With 'expb clodds=both' it even does not work; log states ' ERROR: The CLODDS=PL option is not allowed when a STRATA statement is specified.   ... View more