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Re: st: add observations


From   Ronnie Babigumira <rb.glists@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: add observations
Date   Mon, 6 Aug 2012 17:21:35 +0200

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.
> > 
> > Any suggestions to get us started would be very welcome.
> *
> * 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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