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st: Statistical test for trends


From   Ashwin Ananthakrishnan <ashwinna@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Statistical test for trends
Date   Mon, 20 Apr 2009 18:50:24 -0700 (PDT)

Hello, 

I was wondering if someone could suggest the best statistical test for trends in Stata. 

I'm analyzing proportion of patients on certain medications over 4 consecutive time periods. I'm also analyzing the rates of hospitalization over the same time period (continuous variable, since 1 patient can have more than 1 hospitalization). 

For example, 

          % on med       rate of hospitalization (/100 pts)
Year 1      21                5
Year 2      25                4
Year 3      29                8
Year 4      33                3


Even say a test for trend doesn't meet statistical significance for the % on the medication, the % on med in year 1 may be statistically different from Year 4 (and similarly for the rate of hospitalization between Year 3 and Year 4, but not overall trend for Years 1 - 4). How does one interpret these findings? 

Is correlation analysis the best way to test the significance of the trend?

Thanks, 

Ashwin
                 




      
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