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st: RE; Summarise similar curves


From   Janet Hill <janethill73@yahoo.co.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE; Summarise similar curves
Date   Wed, 24 Apr 2013 11:34:49 +0100 (BST)

I have a dataset which should have consisted of a patient characteristic measured at 6 week intervals over a two year period. There are 400 patients in three groups and I intended to graphically summarise the important features of the groups using the principal component method described by Jones,MC and Rice,JA, 'Displaying the important features of large collections of similar curves, American Statistician,46(1992) 140-145'. Unfortunately the patients did not always turn up on the specified date so I do not have an equispaced dated grid thus precluding the use of this method.

I am now considering using a restricted cubic spline, (rcspline from http://fmwww.bc.edu/RePEc/bocode/r) to show a smoothed curve for each group.

My questions are a) is this a reasonable approach or b) is there anything else in the Stata armamentarium which is more suitable. I am using Stata 12.

Thank you,

Janet

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