Re: st: svyintreg vs. intreg with pweights

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

At 05:28 AM 4/20/2007, Sergiy Radyakin wrote:
> Hello Statalisters,
>
> I have survey data on incomes (in brackets) and pweights are provided as well.
> I would like to find the average income. To do this, I regress the 
> interval ends on a constant using -intreg-
>
> This command works:
>
>    intreg inc1 inc2 [pw=my_weight_variable]
>
> This syntax does not work:
>
>    version 8
>    svyset [pw=my_weight_variable]
>    svyintreg inc1 inc2
>
> (fails after -svyintreg- with the error message "initial values invalid").
> There are no zero or missing weights (if it is of any importance).
I get the same error when I try to estimate a constant-only model 
with svyintreg.  HOWEVER, if you have Stata 9, something like this works:

svy: intreg inc1 inc2

If forced to use Stata 8, you can use the noconstant option, e.g.

gen one = 1
svyintreg inc1 inc2 one, noconstant

As far as i know, your original syntax is fine, i.e.

intreg inc1 inc2 [pw=my_weight_variable]


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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EMAIL:  Richard.A.Williams.5@ND.Edu
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