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Re: st: Question About Evaluating Expressions


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Question About Evaluating Expressions
Date   Thu, 18 Apr 2013 15:09:32 +0100

generate bin_number = ""
local u 10

forvalues i = 900(`u')1500 {
     local I = `i' + `u'
    replace bin_number = "`i'-`I'" if  condition > `i' & condition <= `I'
}

It could be done with one fewer line, the price being a veritable
snowstorm of quotation marks:

generate bin_number = ""
local u 10

forvalues i = 900(`u')1500 {
     replace bin_number = "`i'-`=`i' + `u'')" if (condition > `i' &
condition <= `i' + `u')
}

Nick
njcoxstata@gmail.com


On 18 April 2013 15:03, Erika Kociolek <ekociole@gmail.com> wrote:
> I am trying to "bin" some data into categories using the code below. I
> would like the bin_number variable to look like this:
>
> condition     bin_number
> 905             900-910
>
> If I run the code below, using condition = 905 as an example, I get
> the following:
> condition     bin_number
> 905             900-(900+10)
>
> How do I get Stata to first evaluate what's in the parentheses and
> then put the result into the bin_number variable?
>
> Code:
> generate bin_number = ""
> local u 10
>
> forvalues i = 900(`u')1500{
>      replace bin_number = "`i'" + "-" + "(`i' + `u')" if (condition >
> `i' & condition <= `i' + `u')
> }
>
> Any advice would be greatly appreciated.
> Erika
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