Hi Paolo,

this kind of operation can be easily done with gretl using hansl (with means via scrioft or console)

In order to get a dummy variable with value 1 if a,b, and c are positive numbers and otherwise zero use this code:

series d_all_p = (a>=0 && b>0 && c>0)? 1 : 0

Cheers
Leon

Am 28.05.2012 15:15, schrieb Paolo Caliò:

Hello!

I need to create some dummy variables in order to capture all the possible combinations of a certain set of variables.

For instance, let's assume I have three variables a, b, c.

I need one dummy equal to 1 when all three variables are positive, zero otherwise.
I need one dummy equal to 1 when all three variables are negative, zero otherwise.
I need one dummy equal to 1 when a and b are positive and c negative, zero otherwise.
I need one dummy equal to 1 when a and c are positive and b negative, zero otherwise.
Etc etc etc...

I would do this in Excel since my database is taken from a csv, but the actual number of variables is much higher then 3, so it takes a lot of time to do it manually.

I don't have any idea if it is possible to create these dummies automatically with some piece of code in GretL, but if it is I would really really appreciate your help in writing this code.

Thank you very much in advance.

Cheers,

Paolo
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