Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: AW: help interpreting SVY output


From   "Tomeka Davis" <soctmd@langate.gsu.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: AW: help interpreting SVY output
Date   Tue, 10 Nov 2009 10:24:02 -0500

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" <martin.weiss1@gmx.de> 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: owner-statalist@hsphsun2.harvard.edu 
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Tomeka
Davis
Gesendet: Montag, 9. November 2009 22:33
An: statalist@hsphsun2.harvard.edu 
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.



*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search 
*   http://www.stata.com/support/statalist/faq 
*   http://www.ats.ucla.edu/stat/stata/ 


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search 
*   http://www.stata.com/support/statalist/faq 
*   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index