Date: Fri, 14 Jan 2011 17:28:16 -0500
Reply-To: Gene Maguin <emaguin@buffalo.edu>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Gene Maguin <emaguin@buffalo.edu>
Subject: Re: which test for trend?
In-Reply-To: <1295038892733-3341921.post@n5.nabble.com>
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Aline,
Maybe somebody else will understand better but I don't quite understand your
data. Do you have seven annual samples where each sample has 10, 100, or
1000 records?
Or do you have one record for each year, like 2001: 18%; 2002: 22%; 2003
17%? Seven records total? I'm assuming you have an N or Ns somewhere because
without that I don't think you can do much because you can't compute the
standard error.
Gene Maguin
-----Original Message-----
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of
AB365
Sent: Friday, January 14, 2011 4:02 PM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: which test for trend?
Hi
I am afraid I have a pretty basic question, but I just can't seem to find an
exact answer that I am happy with. It's the usual thing - which test to use?
I have some antimicrobial resistance surveillance data (i.e. X% E. coli
resistant to ampicillin) for 7 points of time (the month of February for 7
consecutive years), and I just want to test whether proportion resistance is
increasing or not. From my (very rusty) statistics knowledge I would have
tried a Chi-squared test for trend, however when I went to go and confirm
for myself that this is the correct test to use .. I found myself more
confused than ever..
Any help appreciated, apologies if this has been answered already
Aline
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