Re: st: Need help with working across variables

[Alison Connor <alison.connor@gmail.com>]

Hi Michael,

There might be a more efficient way to do it, but if you have egenmore
you can do:

 egen x=rall(var1 var2 var3 var4), c(@==1)

This will be 1 if all non-missing variables are 1, and 0 otherwise. If
you only have two values for your variables, then you can run this
command again, and then merge the two into a third variable:

 egen x1=rall(var1 var2 var3 var4), c(@==1)
 egen x2=rall(var1 var2 var3 var4), c(@==2)

gen x=0
replace x=1 if x1==1
replace x=2 if x2==1

If you are going to do this for multiple values, then you can create a loop:

gen x=0
forvalues i=1/2 {
   egen x`i'=rall(var1 var2 var3 var4), c(@==`i')
  replace x=`i' if x`i'==1
  drop x`i'
 }

~Alison


On Sun, Feb 10, 2013 at 10:41 AM, Michael Stewart
<michaelstewartresearch@gmail.com> wrote:
>
> HI ,
> Here is my data format and my question:
> id      var1    var2    var3    var4
> 1       1       1       1       .
> 2       1       1       1       1
> 3       1       2       1       .
> 4       2       2       2       2
> 5       1       1       1       1
> 6       1       2       .       .
> 7       2       1       2       .
>
> I am trying to generate a new variable x =1 if all non missings values
> for the variables(per observation) are equal to 1 and x =2 if all non
> missings values for the variables(per observation) are equal to 2. I
> tried to do foreach loop like
>
> gen x=0
> foreach x in var1 var2 var3 var4{
> replace x=1 if `x'=1
> }
> but it doesnt seem to do the trick
>
> I am specifically interested in to change x =1 if all nonmissign
> values for an observation are equal to one
> For example: I would like to replace x=1 for id=1 but not for id 3
> Similarly, I would like to replace x=2 if all nom missing values for
> an observation are equal to two.
>
> --
> Thank you ,
> Yours Sincerely,
> Mike.
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