Just a guess, here, but judging from your strata/psu info, your
problem may be related to this:
http://www.stata.com/support/faqs/stat/stratum.html
On 6/29/07, Daw, Christina M <[email protected]> wrote:
[model 1]
. suest . , svy
Survey results for .
Number of strata = 125 Number of obs = 45278
Number of PSUs = 361 Population size = 5.513e+08
Design df = 236
------------------------------------------------------------------------------
| Linearized
| Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
pcoop |
evtime | -.0030841 16.38178 -0.00 1.000 -32.27629 32.27012
_cons | -.0196169 1266.51 -0.00 1.000 -2495.128 2495.089
------------------------------------------------------------------------------
[model 2]
. suest ., svy
Survey results for .
Number of strata = 125 Number of obs = 34758
Number of PSUs = 360 Population size = 4.329e+08
Design df = 235
------------------------------------------------------------------------------
| Linearized
| Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
pcoop |
evtime | -.004174 . . . . .
_cons | .1200881 . . . . .
------------------------------------------------------------------------------
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