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RE: st: RE: Creating a time lag dummy

From   Nick Cox <>
To   "''" <>
Subject   RE: st: RE: Creating a time lag dummy
Date   Tue, 10 May 2011 19:46:00 +0100

I don't see why an -if- qualifier is needed! (-if- is not a function.) 


Martijn S

Sorry for this misclassification. I used your code and added an if
fuction and it works!

Thanks a lot!

2011/5/10 Nick Cox <>:

> We can't comment on your code, and thus on what you got wrong, if you don't show any. You could do something like this:
> gen byte IPO5 = inrange(fyear - year_ipo, 1, 5)
> Please use Stata terminology: variables not columns!
> Nick
> Martijn S
> I have a problem generating a 'special' dummy. This is my problem. I
> have the following columns fyear and year_ipo. Now I want to create a
> dummy which gives a 1 when a company has gone public in the prior 5
> calendar years and a 0 otherwise.
> So for example, I have a company which had an IPO in 1999. So this
> dummy should create a 1 for the fiscal year 2000,2001...,2004 and a zero
> for 2005,2006...2010.
> Unfortunately I cannot get the dummy working.

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