[Gretl-users] creating a dummy variable

Hi, I have a time series data set that ranges from 1977Q1 to 2009Q4. I want to create a dummy variable for the recession quarters (1980Q1 - 1980Q3, 1981Q3 - 1982Q4, etc.) as defined by the NBER. How do I do this in Gretl? 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