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

 From ja1@umbc.edu To statalist@hsphsun2.harvard.edu Subject Re: st: calculating df for t and f-statistics in survey linear regression? Date Sat, 9 Sep 2006 14:27:25 -0400 (EDT)

```Thanks Alan.  That was helpful.
Can anyone help me out with T?

> 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
>> Thanks,
>>
>>
>>
>> . 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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>>
> *
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*
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```