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
[email protected]
tel 01224 553876 (direct)
fax 01224 404925
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