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st: RE: Sorting huge Datasets

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Sorting huge Datasets
Date   Thu, 4 Nov 2004 14:54:25 -0000

help sort 

-sort- doesn't sort if the observations 
are already sorted according to the order

help missing 

[email protected] 

Barbara Hofmann
> are there any commands which change the actual sort sequence 
> of a dataset? 
> We got the problem of having some big datasets that must to 
> be sorted every time by the same variables before executing 
> commands on them. It takes up a lot of time to sort them, so 
> we got two questions. 
> First, are there certain commands that change the sort 
> sequence and others who keep it? And second, is there any 
> command (e.g. assert) in order to check the sort sequence and 
> only in case of being unsorted sorts the data?
> ps: what is the intern value of a missing?

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