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...t when I call glm.predict, I get the warning message:  Warning message: 'newdata' had 42 rows but variable(s) found have 80 rows  ---------------------  s = sample(1:122) glm.my.data=glm(my.data.class[s[1:80]]~t(my.data)[s[1:80],1:60],family="binomial") pred.my.data = predict(glm.gse13355,as.data.frame(t(my.data)[s[81:122],1:60]),type="response") Warning message: 'newdata' had 42 rows but variable(s) found have 80 rows length(pred.my.data) [1] 80 Thanks Carol [[alternative HTML version deleted]]