The SAS DIF function is another useful tool for operating on previous records. Lets say you want to know the difference in the last year’s revenue and this year’s revenue. Here is the data: Year Revenue 2001 10,000 2002 30,000 2003 60,000 2004 100,000 data revenue1; set revenue; Rev_increase=dif1(revenue); run; Year Revenue Rev_increase 2001 10,000 […]