At a time still in the future for most of us,
on 21/11/2002 4:46 pm, ann e fitzmaurice at [email protected] wrote:
> 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
I think you have misunderstood what a PSU is. The PSU identifies records
which come from the same unit (mother, in your case) NOT the number of
records that come from that unit.
Ronan M Conroy ([email protected])
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2329)
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