Re: st: how to weight

[Richard Williams <Richard.A.Williams.5@nd.edu>]

At 01:29 PM 3/10/2004 -0500, Lijun Song wrote:
> Hi All,
>
> I just transfered one data from spss into stata. The original spss data
> ever are weighted. After transference, however, the stata data are not
> weighted. How to weight the resultant stata data, then?
Type -help weight-.  In SPSS, you might have

weight by wgt
regression....

In Stata,

reg y x [fw = wgt]

For better or for worse, SPSS lets you give the weight command once and it 
then holds for all subsequent procedures; Stata makes you keep on repeating 
the weighting as a parameter on your commands (unless you happen to be 
using the svy commands).  But, Stata's weighting features are more powerful 
than what is available in SPSS.

Also, depending on what kinds of weights you are using, the -expand- 
command can be used to expand the data set.  This is handy if, say, you are 
analyzing data that has been collapsed into a table, and the weights 
represent the cell frequencies.


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