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.
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 Caliņ:
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.