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RE: st: Setting a missing value in a generic context


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Setting a missing value in a generic context
Date   Mon, 7 Mar 2005 17:50:02 -0000

It would seem that there is no generic
object or function to do what you want. 

As you know, -missing()- returns true 
or false to "is this missing?". 

But your code could presumably be 
condensed to 

local typ: type `v'
local missvalue = cond(substr("`typ'", 1, 3) == "str", `""""', ".") 
replace `v' = `missvalue'

and even to 

local missvalue = cond(substr("`: type `v''", 1, 3) == "str", `""""', ".") 
replace `v' = `missvalue'

without, however, being quite as elegant 
as one might wish. 


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

David Kantor
 
> If you are interested, I have used similar code in a slightly 
> different 
> way, which enables either -replace- or -post- (or both):
> 
> local typ: type `v'
> if substr("`typ'", 1, 3) == "str" {
>   local missvalue = `""""'
> }
> else {
>   local missvalue = "."
> }
> 
> ...
> replace `v' = `missvalue'
> 
> or:
> 
> postfile postname `typ' var1 ...
> ...
> post postname  (`missvalue') ...
> 

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