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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 18:07:09 +0200

Yes you are correct, I meant "omitted from the data". 

Ronnie

Ps: still interested on how to do this using your original suggestion as I think it is neater than what I have tried. 

-- 
010100100110111101101110011011100110100101100101




On Monday, August 6, 2012 at 6:01 PM, Nick Cox wrote:

> By missing you appear to mean "omitted from the data"; that is not
> what Stata documentation means by "missing". Missing means present in
> the data but with a missing value.
> 
> Nick
> 
> 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.
> > > > 
> > > > 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/



*
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