https://communities.sas.com/t5/SAS-Procedures/Unbalanced-Data-in-Proc-Logistic/m-p/76852#M22284 Yup. Most of the time data are unbalanced for human studies analysis (we don't have nearly the control of our research subjects as in Ag!). Just like in GLM vs Latin Squares ANOVA, you lose some power by the lack of balance, but you gain in flexibility. Wed, 11 Mar 2009 19:40:25 GMT Doc_Duke 2009-03-11T19:40:25Z https://communities.sas.com/t5/SAS-Procedures/Unbalanced-Data-in-Proc-Logistic/m-p/76851#M22283 Is PROC LOGISTIC OK to use with unbalanced data- I assume that since it will give type3 analysis of effects in output that it is designed to handle unbalanced data as PROC GLM does. <BR /> <BR /> -thanks Wed, 11 Mar 2009 19:07:43 GMT https://communities.sas.com/t5/SAS-Procedures/Unbalanced-Data-in-Proc-Logistic/m-p/76851#M22283 deleted_user 2009-03-11T19:07:43Z https://communities.sas.com/t5/SAS-Procedures/Unbalanced-Data-in-Proc-Logistic/m-p/76852#M22284 Yup. Most of the time data are unbalanced for human studies analysis (we don't have nearly the control of our research subjects as in Ag!). Just like in GLM vs Latin Squares ANOVA, you lose some power by the lack of balance, but you gain in flexibility. Wed, 11 Mar 2009 19:40:25 GMT https://communities.sas.com/t5/SAS-Procedures/Unbalanced-Data-in-Proc-Logistic/m-p/76852#M22284 Doc_Duke 2009-03-11T19:40:25Z