Posted by
Maguin, Eugene on
Jan 14, 2011; 10:28pm
URL: http://spssx-discussion.165.s1.nabble.com/which-test-for-trend-tp3341921p3342067.html
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:
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AB365
Sent: Friday, January 14, 2011 4:02 PM
To:
[hidden email]
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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