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Re: st: test for trend from table data?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: test for trend from table data?
Date   Mon, 16 Jun 2003 06:34:50 -0700 (PDT)

--- "Copeland, Laurel" <Laurel.Copeland@med.va.gov>
wrote:
> A pharmacist asked me if I could do a test for trend
> over time from this
> table:
> 
> Year	Pharm	Clin
> 1997	400	44
> 1998	221	54
> 1999	187	69
> 2000	123	63
> 2001	74	42
> 2002	145	149
> 
> The table represents the number of reports of
> adverse events made by
> pharmacists (Pharm) and by clinicians (Clin),
> respectively.  

You can do a linear test for trend by fitting a linear
regression model with -regress-. I think that to
compare year-to-year,however, you need denominators
for each year. In other words, for 2001 74 adverse
outcomes out of 75 patients is very different than 75
out of 1000 patients. If you can get denominator data,
then you may want to use -tabodds-.

Best,
Ricardo.


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