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