Sorry for the lack of clarity. After svyset I use the svy: regress
command. This is where I get a count of the strata and PSUs, as in the
following set of results.
. svy: regress math perelm bymach lunch whtpct member suburban
townrur midwest west south pupilexp
(running regress on estimation sample)
Survey: Linear regression
Number of strata = 87 Number of obs =
7741
Number of PSUs = 455 Population size =
2079494.4
Design
df = 368
F( 11,
358) = 4.48
Prob > F
= 0.0000
R-squared = 0.0318
------------------------------------------------------------------------------
| Linearized
math | Coef. Std. Err. t P>|t| [95% Conf.
Interval]
-------------+----------------------------------------------------------------
perelm | -.0027674 .009638 -0.29 0.774 -.0217199
.0161851
bymach | .0012292 .0014766 0.83 0.406 -.0016743
.0041328
lunch | .1672079 .0848558 1.97 0.050 .0003447
.3340711
whtpct | -.0002636 .0007161 -0.37 0.713 -.0016717
.0011444
member | .0000399 .0000801 0.50 0.619 -.0001177
.0001974
suburban | -.0351555 .0394778 -0.89 0.374 -.1127859
.0424749
townrur | -.0969806 .048962 -1.98 0.048 -.1932611
-.0007001
midwest | -.062071 .0501236 -1.24 0.216 -.1606357
.0364937
west | .0914772 .0535214 1.71 0.088 -.0137689
.1967233
south | .0783868 .0576097 1.36 0.174 -.0348986
.1916722
pupilexp | 8.25e-07 6.31e-06 0.13 0.896 -.0000116
.0000132
_cons | 2.259222 .1675219 13.49 0.000 1.929801
2.588642
------------------------------------------------------------------------------
Note: strata with single sampling unit treated as certainty units.
Thanks.
>>> "Martin Weiss" <[email protected]> 11/10/2009 7:38 AM >>>
<>
Which "standard errors" are you referring to? -svyset- only declares
the
design to Stata.
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Tomeka
Davis
Gesendet: Montag, 9. November 2009 22:33
An: [email protected]
Betreff: st: help interpreting SVY output
Hello -
This is my first time using the set of SVY commands in Stata and I have
a
few questions. When I use the syntax:
svyset psu [pweight=pw], strata (strata)
Stata 1) does not calculate the standard errors and 2) I get a
message
stating that standard errors are" missing because of stratum with
single
sampling units".
Furthermore, I am also getting incorrect counts for my PSU. There
were
originally only 100 PSUs in my data. However, I do get standard errors
with
the following syntax:
svyset psu [pweight=pw], strata (strata) || _n, singleunit(certainty)
But I still get a 455 PSU count. Again, I have never used SVY to
account
for clustering and complex survey design. I would appreciate any
advice.
Thank you.
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