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# Re: st: add observations

 From Ronnie Babigumira To statalist@hsphsun2.harvard.edu Subject Re: st: add observations Date Mon, 6 Aug 2012 19:26:20 +0200

```Thanks Nick,

On the rules, thought I'd mentioned them in the first email. Each unit (hcod) should have four periods (pd), 1, 2, 3,and, 4 (hence my use of -fillin-)

Otherwise, I think the first part of the code you shared does not appear to be doing what you intended.

Best,

Ronnie

--
010100100110111101101110011011100110100101100101

On Monday, August 6, 2012 at 6:35 PM, Nick Cox wrote:

> The rules for your data remain cryptic to me. I think you are saying
> that for at least some values of -hcod- only three distinct values of
> -pd- are observed and the other one is the appropriate replacement.
> You could try something like this
>
> gen obs = ""
> bysort hcod (pd) : replace obs = obs + string(pd) if _n == 1 | pd != pd[_n-1]
>
> gen rep = 4 if obs == "123"
> replace rep = 3 if obs = "124"
> replace rep = 2 if obs = "134"
> replace rep = 1 if obs = "234"
>
> local N = _N + 1
> expand 2
> replace pd = rep in `N'/L
>
>
> On Mon, Aug 6, 2012 at 4:21 PM, Ronnie Babigumira <rb.glists@gmail.com (mailto:rb.glists@gmail.com)> wrote:
> > Thanks Nick,
> > This works perfectly for the one unit, however, I have many units and, the missing pd varies from unit to unit. Suggestions on how your solution can be modified to handle this?
> >
> > My early thinking (and block) was thinking I needed to used -fillin- (and may be levels) however, after sending the email to the list it occurred to me that splitting and then appending the data may do the job. Here is what I have tried.
> >
> > clear
> > input ///
> > str8 hcod pd pdt
> > 2081115 1 12
> > 2081115 3 21
> > 2081115 3 11
> > 2081115 4 13
> > 3031028 1 45
> > 3031028 2 21
> > 3031028 2 11
> > 3031028 3 42
> > 3031028 3 13
> > 3031028 3 12
> > 3061037 2 12
> > 3061037 3 45
> > 3061096 1 42
> > 3061096 1 21
> > 3061096 4 45
> > 3061096 4 12
> > 3061196 1 42
> > 3061196 1 45
> > 3061196 4 12
> > 3061306 1 21
> > 3061306 1 45
> > 3061306 4 42
> > 3061306 4 12
> > 3062277 1 41
> > 3062277 4 12
> >
> >
> > end
> >
> > tempfile master
> > save `master'
> >
> > fillin hcod pd
> > bysort hcod (pdt): replace pd = pd[_N]
> > drop if mi(pdt)
> > append using `master'
> > sort hcode pd
> > list, clean noobs
> >
> > Ronnie
> > --
> > 010100100110111101101110011011100110100101100101
> >
> >
> >
> >
> > On Monday, August 6, 2012 at 3:07 PM, Nick Cox wrote:
> >
> > > local N = _N + 1
> > > expand 2
> > > replace pd =4 in `N'/L
> > >
> > >
> > > On Mon, Aug 6, 2012 at 1:25 PM, Ronnie Babigumira <rb.glists@gmail.com (mailto:rb.glists@gmail.com)> wrote:
> > > > Dear listers,
> > > >
> > > > I have a dataset that looks like this
> > > > hcod pd pdt
> > > > 3092285 1 31
> > > > 3092285 1 43
> > > > 3092285 2 11
> > > > 3092285 2 21
> > > > 3092285 2 41
> > > > 3092285 2 45
> > > > 3092285 3 42
> > > >
> > > >
> > > >
> > > >
> > > > I would like to add new observations so that I end up with
> > > > hcod pd pdt
> > > > 3092285 1 31
> > > > 3092285 1 43
> > > > 3092285 2 11
> > > > 3092285 2 21
> > > > 3092285 2 41
> > > > 3092285 2 45
> > > > 3092285 3 42
> > > > 3092285 4 31
> > > > 3092285 4 43
> > > > 3092285 4 11
> > > > 3092285 4 21
> > > > 3092285 4 41
> > > > 3092285 4 45
> > > >
> > > > 3092285 4 42
> > > >
> > > >
> > > >
> > > > Basically, each unit (hcod) should have 4 periods (pd). What we would like to do is add all products (pdt) present in the non-missing periods to the missing period.
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```

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