Hi there,   I have a dataset that is structured the following way:   Customer_ID Date_offended A 19JUL2011:00:00:00.000 A 29AUG2013:00:00:00.000 A 29MAR2015:00:00:00.000 B 05MAR2010:00:00:00.000 B 14AUG2010:00:00:00.000 C 06JUL2013:00:00:00.000 C 02JUN2015:00:00:00.000 D 21AUG2009:00:00:00.000 D 02MAY2013:00:00:00.000   I want to be able to calculate the difference (in number of days or months) between the dates of offence for these customers. How do I go about it?   I appreciate your help in advance!   Krisztina ... View more

Dear Sas Support Group, I have a model where I look at the accident risk of 3 different groups, including a dummy for group, the age category, gender, median income (standardized by subtracting the mean and dividing by two standard deviation) and an interaction between median income and the groups, since I believe that the effect of income on each group will be different. To be able to interpret the effect, I used the statement estimate, however I am not totally sure if I gave the right formula, although I do get some results. What I have as code is the following: genmod data=data1 desc; group gender age_cat; coll1=group age_cat gender st_medinc group*st_medinc / dist=binomial link=log type3; 'group1 versus group3' group*st_medinc 1 0 -1/exp; 'group1 versus group2' group*st_medinc 1 -1 0 /exp; 'group2 versus group3' group*st_medinc 0 1 -1 /exp; Could someone have a look and confirm if I did it correctly or if I need to correct the estimate statement somewhere? Thanks in advance for your help, Regards, Krisztina Gurzo ... View more