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st: svytab and note to analysis


From   ann e fitzmaurice <ogy140@abdn.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: svytab and note to analysis
Date   Thu, 21 Nov 2002 11:46:07 -0500 (EST)

hi

i have the following output and it shows a note after the table 
The psu was created from a variable with 9 levels which have been 
truncated to 5 and this is what is causing the message, does this 
note imply that the analysis is invalid, when the psu had nine 
levels (it is possible to have up to 20) the associated p value was 
0.0397

any help greatly appreciated

regards

ann
  log type:  text
 opened on:  21 Nov 2002, 11:37:26

. svytab v106a sib_grp  if level1 ==1, pearson  row  count format (%9.2f)

pweight:  weight                                Number of obs      =     12531
Strata:   <one>                                 Number of strata   =         1
PSU:      sib_no1a                              Number of PSUs     =         5
                                                Population size    = 12489.897

--------------------------------------------------
education |
levels    |
transpose |     grouping variable for sibling     
d         |    alive  non-mate   materna     Total
----------+---------------------------------------
   higher |    12.75      0.51      0.00     13.26
          |     0.96      0.04      0.00      1.00
          | 
  seconda |   464.89     15.74      5.10    485.72
          |     0.96      0.03      0.01      1.00
          | 
  primary |  2471.94     62.05     45.77   2579.76
          |     0.96      0.02      0.02      1.00
          | 
  no educ |  8779.22    363.91    268.02   9411.15
          |     0.93      0.04      0.03      1.00
          | 
    Total | 11728.80    442.22    318.88  12489.90
          |     0.94      0.04      0.03      1.00
--------------------------------------------------
  Key:  weighted counts
        row proportions

  Note:  variance estimate degrees of freedom = 4
         are less than
         nominal table degrees of freedom = 6

  Pearson:
    Uncorrected   chi2(6)         =   27.9839
    Design-based  F(1.63, 6.51)   =    3.4000     P = 0.1021

----------------------
ann e fitzmaurice
medical statistician
dugald baird centre
department of obs and gynae
university of aberdeen
a.e.fitzmaurice@abdn.ac.uk
tel 01224 553876 (direct)
fax 01224 404925






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