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st: trend test


From   Tim Evans <Tim.Evans@wmciu.nhs.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: trend test
Date   Tue, 4 Dec 2012 10:31:44 +0000

Hi all,

I'm using Stata 11.2, and I am looking at the uptake of a disease screening programme and its affects on the use of a particular procedure over time. Apologies if this is a rather rudimentary query in nature, but I have two of them. 

One is if I have count data between 1998 - 2010 (and for each year in between) for this given procedure how should I test for a trend. It was suggested I used a single tail t-test, however I was against this as it assumed the trend only went in one direction. After doing some searches, I've been using the reverse arrangement test (but not in Stata unfortunately!). Is this an acceptable method to test for trends? 

Two, if I cut my data by age groups and want to measure whether a decrease or increase in the use of a particular procedure is quicker in one group compared to another, is there a better method to choose.

Many thanks for your help.

Best wishes

Tim

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