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st: Correlation between 2 variables overtime- accounting for repeated measures


From   megan rossi <megan_rossi@msn.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Correlation between 2 variables overtime- accounting for repeated measures
Date   Sat, 16 Mar 2013 22:32:19 +1000

Hi All
Can you please recommend what syntax would be most appropriate for my below senario

40 participants with three repeated measures (baseline, year 1, year 2)- observational study ie. no intervention
At each of these three time points two continous variables (a) and (b) were measured. I want to know whether (a) and (b) are correlated. If I do a correlation at one time point ie. year 1 the correlation is not significant which I believe is due to the small numbers ie. 40. If I can find a method of accounting for the lack of dependence among these three time points ie. repeated measures I will effectively have 120 pieces of data, which should be sufficient to see a correlation if one really exists.
Cheers,

Megan Rossi APD
PhD Candidate School of Medicine, University of Queensland
Accredited Practicing Dietitian
Princess Alexandra Hospital Nutrition & Dietetic Department
m: 0402 931 441 | e: megan_rossi@msn.com

"Let food be thy medicine and medicine be thy food." — Hippocrates (ca. 460 – 377 BC)

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