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st: RE: Creating missing data

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Creating missing data
Date   Thu, 4 Nov 2004 01:18:13 -0000

Suppose your identifiers run 1, 2, ... . If this isn't true, 

. egen id = group(whateverisyourid) 

will make it so. 

Now, if I understand you correctly, you want to 

. bysort id (entrytime): 
	replace somevar = . if _n == 1 & mod(id,5) == 0 

[email protected] 

[email protected]
> My 
> question is about making an adjustment to the surrogate data set. The 
> surrogate data set contains about 3500 cases, some of which 
> have just one 
> record per case, and others have multiple records. Each record has a 
> variable recording an entering time and an exit time for that record. 
> Hence, single record cases have one entry time and one exit 
> time; multiple 
> record cases have multiple entry and multiple exit times. I 
> would like to 
> convert the first entry time for every fifth multiple-record 
> case in this 
> data set into a missing value. Are there any suggestions for 
> how this might be done. 

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