Hello, Trying to test the proportional hypothesis. Can anyone tell me what is wrong? PROC PHREG DATA=CBD.MERGE_CBD_CB1; MODEL T_OS*OS (0) = MEAN_SC_CB1 SENT_cat cms_AGE cms_TABAC / TIES=EFRON; WHERE 1 <= N_CORE_CB1 <= 4; OUTPUT OUT = cbd.resschoe_CB1 wtressch=schMEAN_SC_CB1 schSENT_cat schcms_AGE schcms_TABAC; RUN; PROC SORT DATA=cbd.merge_cbd_cb1; BY T_OS; RUN; PROC SORT DATA=cbd.resschoe_CB1; BY T_OS; RUN; DATA cbd.resschoe_CB1_END; MERGE cbd.merge_cbd_cb1 cbd.resschoe_cb1; WHERE 1 <= N_CORE_CB1 <= 4; BY T_OS; LOGT=LOG(T_OS) RUN; PROC SORT DATA=cbd.resschoe_cb1_end; BY T_OS; RUN; *****This section is not working:******* DATA CBD.RESSCHOE_CB1_END; SET CBD.RESSCHOE_CB1_END; WHERE 1 <= N_CORE_CB1 <= 4; LOGT=LOG(T_OS); RUN; ***It says: NOTE: Invalid argument to function LOG(0) at ligne 76 colonne 6.*** Cheers, J
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