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Thanks for the guidance! After removing quotes, here is the log, it was the same whether I used format statement or not: NOTE: The SAS System stopped processing this step because of errors. 307 strata group; 308 class CMV_IgG_rev (ref=2); - 22 200 ERROR 22-322: Syntax error, expecting one of the following: a quoted string, FIRST, LAST. ERROR 200-322: The symbol is not recognized and will be ignored. 309 model PEstatus (event='1')= CMV_IgG_rev; 310 run;   ... View more

Hi, Thanks for the advice! Here is the output:   Variables in Creation Order# Variable Type Len Format Informat12345 group Num 8 BEST12. BEST12. type Char 7     ID Char 4 $100. $100. PEstatus Num 8 BEST12. BEST12. CMV_IgG_rev Num 8 BEST12. BEST12. ... View more

Hi, proc logistic data= pe. matched_21_plus_co_inf_updated; strata group; class CMV_IgG_rev (ref='2'); model PEstatus (event='1')= CMV_IgG_rev; run;   Log: 288 proc logistic data= pe. matched_21_plus_co_inf_updated; NOTE: Data file PE.MATCHED_21_PLUS_CO_INF_UPDATED.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. 289 strata group; 290 class CMV_IgG_rev (ref='2'); 291 model PEstatus (event='1')= CMV_IgG_rev; 292 run; ERROR: Invalid reference value for CMV_IgG_rev. NOTE: The SAS System stopped processing this step because of errors. NOTE: There were 78 observations read from the data set PE.MATCHED_21_PLUS_CO_INF_UPDATED. NOTE: PROCEDURE LOGISTIC used (Total process time): real time 0.08 seconds cpu time 0.04 seconds   ... View more