On Wed, 4 May 2011, Qi Shi wrote: > There are three variables y,x.and z in my data, in which z is a > dummy. I would like to define a new variable w: if z=1, w=y; > otherwise w=-infinity. What is the scripts? thanks!
In principle, w = (z==1)? y : -1/0 However, you can't actually represent infinities in gretl: the expression "-1/0" will produce a missing value (NA). Allin Cottrell
