thanks but this way I would need to manually specify every dummy, which
would still require a lot of time since I have a lot of variables (I'm
using three here just to make a quick example).
What I'm looking for (if this possibility exists) is some sort of loop
which would create a dummy for each possible combination of positive and
negative variable a, b and c.
Thanks again for your help.
2012/5/28 Pindar <pindar777(a)googlemail.com>
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
Am 28.05.2012 15:15, schrieb Paolo Caliò:
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
I need one dummy equal to 1 when all three variables are negative, zero
I need one dummy equal to 1 when a and b are positive and c negative, zero
I need one dummy equal to 1 when a and c are positive and b negative, zero
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.
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