Dear all, I use the "educational attainment and earnings" data set from Dougherty (2007) to explain the idea of a logit (or probit) model in the classroom. When I moved my files from EViews to gretl, I have difficulties to generate a dummy for the cases where the value for the variable s is larger than a certain threshold (let's say 12) to estimate what Dougherty did with his "GRAD" variable in the book. I knew how it worked in Eviews but in gretl I thought the following part of the help is relevant: "A tip regarding dummy variables: Suppose x is coded with values 1, 2, or 3 and you want three dummy variables, d1 = 1 if x = 1, 0 otherwise, d2 = 1 if x = 2, and so on. To create these you can use the commands: genr d1 = (x=1) genr d2 = (x=2) genr d3 = (x=3)" So I tried "genr dummy = (s>11)" Did not work out. How can I handle this? Best, Ulrich Professor Dr. Ulrich Fritsche Fachbereich Sozialökonomie Fakultät Wirtschafts- und Sozialwissenschaften Universität Hamburg Von-Melle-Park 9 20146 Hamburg www.ulrich-fritsche.net