Re: st: Mvdecode Problem

[Nick Cox <njcoxstata@gmail.com>]

I should have said: Good question (assuming that is correct).

But now I find that I can't reproduce it. So, please show us the evidence.

. clear

. set obs 10
obs was 0, now 10

. gen age = -10 + _n

. l

     +-----+
     | age |
     |-----|
  1. |  -9 |
  2. |  -8 |
  3. |  -7 |
  4. |  -6 |
  5. |  -5 |
     |-----|
  6. |  -4 |
  7. |  -3 |
  8. |  -2 |
  9. |  -1 |
 10. |   0 |
     +-----+

. mvdecode age, mv(0/-9)
         age: 10 missing values generated

. l

     +-----+
     | age |
     |-----|
  1. |   . |
  2. |   . |
  3. |   . |
  4. |   . |
  5. |   . |
     |-----|
  6. |   . |
  7. |   . |
  8. |   . |
  9. |   . |
 10. |   . |
     +-----+
Nick
njcoxstata@gmail.com


On 23 August 2013 15:56, James Jensen <jamesjensen212@yahoo.com> wrote:
> 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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