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st: RE: generating a variable?


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: generating a variable?
Date   Thu, 28 Jul 2011 20:23:37 +0100

I am very surprised that you imply that this even works at all. "then" is just fantasy code so far as Stata is concerned. Alternatively, if this is a mix of Stata and pseudocode, then please show us the real Stata code. 

See also 

FAQ     . . . . . . . . . . . . . . . . . . . . .  if command vs. if qualifier
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  J. Wernow
        6/00    I have an if or while command in my program that
                only seems to evaluate the first observation,
                what's going on?
                http://www.stata.com/support/faqs/lang/ifqualifier.html

to learn that -if- as you (intend to) use it is not what you want. 

Nick 
n.j.cox@durham.ac.uk 

Ignacio Martinez

I'm having troubles generating 2 new variables with my data.

I have the following variables: ID; E01-E12 where E01 =3 indicates
that i is enrolled in a 4 year college in January, and E05=2 means
that he is enrolled in a 2 year college in may.

I want to generate a 2 new variables Total_2_year that is the total
number of month that i is enrolled in a 2 year college and
total_4_year that is the total number of month that i is enrolled in a
4 year college.

What is the best way of doing this?

My first attempt was this
<code>
*Generates vectors of total months enrolled in college
gen total_2_year = 0
gen total_4_year = 0
gen total_none = 0


forvalues month=1/9 {
		if 511200`month'==3 then total_4_year==total_4_year+1
		if 511200`month'==2 then total_2_year==total_2_year+1
		if 511200`month'==1 then total_none==total_none+1
		if 511200`month'==-4 then total_none==-4		
		if 511200`month'==-4 then total_2_year==-4
		if 511200`month'==-4 then total_4_year==-4										
	}

</code>

but i get only zeros... :_(


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