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Re: st: calculating df for t and f-statistics in survey linear regression?


From   "Alan Neustadtl" <alan.neustadtl@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: calculating df for t and f-statistics in survey linear regression?
Date   Sat, 9 Sep 2006 14:02:06 -0400

The df for the F-test is given in your results as 3 and 86.  Number of
strata minus 1 ans number of PSUs minus 4.  I'm not certain about the
t-tests.

Alan

On 9/9/06, ja1@umbc.edu <ja1@umbc.edu> wrote:
Hi All,
I'm trying to figure out how to compute the df for t and F in these
results (below).  I'm not sure what is being used as N?  Any direction
would be helpful.
Thanks,
Jade



. svyreg  fac_etoh bio_sex age dep_sum

Survey linear regression

pweight:  gswgt1                               Number of obs    =      1348
Strata:   region                               Number of strata =         4
PSU:      psuscid                              Number of PSUs   =        92
                                               Population size  = 1138728.8
                                               F(   3,     86)  =     11.46
                                               Prob > F         =    0.0000
                                               R-squared        =    0.0448
------------------------------------------------------------------------------
fac_etoh |      Coef.    Std. Err.      t    P>|t|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
bio_sex |   .3015771    .0693058     4.35   0.000    .1638464    .4393079
age     |  -.0744264    .0298961    -2.49   0.015   -.1338386   -.0150142
dep_sum |  -.0153594    .0047195    -3.25   0.002   -.0247383   -.0059805
_cons   |    .919665    .5149458     1.79   0.078   -.1036815    1.943011


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