[Gretl-users] creating ID variables

Hi, Suppose I have a data set of 200 cars where the observation labels are the make (Chevy, Honda, BMW, etc.). Say there are 10 makes. I want to create a variable, say ID, that identifies the make so I don't have to rely on the observation label. The purpose is to later create dummies for the makes to include in a regression model and create boxplots (one for each make's price, all shown in one plot window) of price. How can I do this? Or is it better to just use the observation labels and laboriously write if statements? Thanks, Walt ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 ________________________ (V) 609-936-8999 (F) 609-936-3733 walt(a)dataanalyticscorp.com www.dataanalyticscorp.com _____________________________________________________ -- ________________________ Walter R. Paczkowski, Ph.D. Data Analytics Corp. 44 Hamilton Lane Plainsboro, NJ 08536 ________________________ (V) 609-936-8999 (F) 609-936-3733 walt(a)dataanalyticscorp.com www.dataanalyticscorp.com