Hello,   I have a continuous explanatory variable, a continuous dependent variable, a dummy variable and an interaction variable. However the t value for the variable mentioned lnx gets different results for the two methods. Does someone have an idea of why?   The overall F-test is the same for both proc reg and glm. The dummy (dummy_APO_E ) variable is either 0 or 1 and the interaction (interaktion) variable is the interaction between lnx and dummy_APO_E . Both of them show the same t value with the same p value for proc reg and glm.   The code that I run looks like this: proc reg data=merg3_data; model AVAL =lnx interaktion dummy_APO_E ; run; proc glm data=merg3_data ; class dummy_APO_E; model aval = lnx |dummy_APO_E / solution; run; I am using SAS Enterprise Guide 8.3   Best regards, Tobias ... View more