Re: st: Mvdecode Problem

[James Jensen <jamesjensen212@yahoo.com>]

Thanks nick.

I am still not sure why when I used mvdecode age, mv(0/-9) the -9 did not become missing and it is only when I used mvdecode age, mv(-9) the -9 then became missing?




----- Original Message -----
From: Nick Cox <njcoxstata@gmail.com>
To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Cc: 
Sent: Friday, 23 August 2013, 15:36
Subject: Re: st: Mvdecode Problem

It shouldn't make a difference. Both forms are valid numlists.

. numlist "0/-9"

. ret li

macros:
            r(numlist) : "0 -1 -2 -3 -4 -5 -6 -7 -8 -9"

. numlist "-9/0"

. ret li

macros:
            r(numlist) : "-9 -8 -7 -6 -5 -4 -3 -2 -1 0"

Notice that whenever you have issued the first command, the second
command is redundant and won't undo recoding of zeros to missing.

Nick
njcoxstata@gmail.com


On 23 August 2013 15:27, James Jensen <jamesjensen212@yahoo.com> wrote:
> Hi all,
>
> I want to code whatever negative or zero in the dataset to missing.
>
> If I use mvdecode _all, mv(0/-9)  or mvdecode _all, mv(-9/0)
>
> Then I notice when I used mvdecode _all, mv(0/-9) , the -9 did not become missing.
>
> The second thing is that I want to recode whatever negative to missing.
>
> If I use mvdecode _all, mv(-1/-9)  or mvdecode _all, mv(-9/-1)
>
> Would it make a difference whichever way I put the -1 or -9 first?
>
>
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