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st: Royston's Conditional Growth Reference


From   "Zhiqiang Wang" <wang@menzies.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Royston's Conditional Growth Reference
Date   Wed, 4 Dec 2002 15:46:13 +0930

Hello
My colleague is seeking advice on Stata procedures for generating
conditional growth intervals using the method described by Patrick Royston.

Reference: Royston P(1995) Calculation of unconditional and conditional
reference intervals for foetal size and growth from     longitudinal
measurements. Statistics in Medicine 14:1417-1436.

Data look like:
id   age    weight
1    0        2.8
1    3        5.7
1    6        7.2
1    12      9.0
2    0        3.2
2    3        6.0
2    6        8.5
2    12       10.6
...
Question is how to get standard deviation scores of achieved weight at each
time point contional on previous weight.
Thanks

Zhiqiang





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