On Wed, 7 Mar 2012, Data Analytics Corp. wrote:
 I have car data that I imported from excel.  The first column of the
 excel worksheet has a car designation label: econ or prestige.  The
 first 40 observations are econ cars and the next 40 are prestige cars.
 In Gretl, the designation appears as a row label.  I'd like to subset
 the data to model the econ cars.  I tried to create a dummy variable,
 seg, as
 seg = (obs == "econ") 
Try seg = (obs < 41)
Allin Cottrell