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st: RE: append and strange doings

From   "Nick Winter" <[email protected]>
To   <[email protected]>
Subject   st: RE: append and strange doings
Date   Thu, 18 Jul 2002 17:28:32 -0400

Even better, how about having -append- return the number of common
variables, and the number of unique variables from the master and using
datasets?  Then one could automate the checking of whether it worked...

Nick W

> -----Original Message-----
> From: baum [mailto:[email protected]] 
> Sent: Thursday, July 18, 2002 4:47 PM
> To: StataList
> Subject: st: append and strange doings
> It seems like -append- ought to be smart enough to at least 
> give a warning 
> if you try to append a dataset with NO variables in common 
> with the master 
> dataset. I just run into this helping a colleague who has a 
> dozen Census 
> extract files, produced elsewhere and probably used by a number of 
> researchers. He was appending them in a -for- loop. _One_ of 
> those files, 
> it turns out, has UPPER CASE FILENAMES. The rest have all the same 
> variables with lower case filenames. Yes, once you figure that out, 
> "renvars _all, lower" (STB) does a very nice job of cleaning 
> up this mess, 
> but the outcome of appending 85 variables, none of which are 
> in common with 
> the 85 variables in memory, is to double the memory 
> requirements---so you 
> get a r(901), and eonder why that should possibly be 
> happening when the 
> size of the data is not increasing by that much.
> Might -append- reasonably give you a warning that appending 
> without any 
> common contents between the master and using datasets is 
> surely likely to 
> be a logical error?
> Kit
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