Question: Fisher'S Exact Test And Odds Ratio
1
gravatar for Diana
3.6 years ago by
Diana20
Diana20 wrote:

Hello everyone,

Im trying to perform Fisher's exact test in R. Im calculating odds ratio like this

(no.of successes in my set) X (no. of failures in background set) / (no.of successes in background set X no. of failures in my set)

In the denominator i get 0 for some cases because failures in my set are 0 for some cases.

Can anyone tell me how to calculate p-values from odds ratio? Also what does it mean if we say odds ratio should be greater or less than 1?if I want to test over-representation in my set against the background set what should be the odds ratio and how can I calculate that?

Many thanks.

test • 2.3k views
ADD COMMENTlink modified 3.6 years ago by Neilfws45k • written 3.6 years ago by Diana20
2

you are more likely to find an expert on the Statistics StackExchange: http://stats.stackexchange.com/

ADD REPLYlink written 3.6 years ago by Michael Kuhn4.8k
5
gravatar for Neilfws
3.6 years ago by
Neilfws45k
Sydney, Australia
Neilfws45k wrote:

Too many questions in one :)

The short answer: this issue has been discussed at Stats StackExchange; they recommend studying this PDF and using the associated R package, aylmer.

ADD COMMENTlink written 3.6 years ago by Neilfws45k
1

thanks, that PDF is very informative.

ADD REPLYlink written 3.6 years ago by brentp20k
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