Question: Fisher'S Exact Test And Odds Ratio
gravatar for Diana
2.2 years ago by
Diana10 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.

ADD COMMENTlink modified 2.2 years ago by Neilfws41k • written 2.2 years ago by Diana10

you are more likely to find an expert on the Statistics StackExchange:

ADD REPLYlink written 2.2 years ago by Michael Kuhn4.7k
gravatar for Neilfws
2.2 years ago by
Sydney, Australia
Neilfws41k 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 2.2 years ago by Neilfws41k

thanks, that PDF is very informative.

ADD REPLYlink written 2.2 years ago by brentp17k
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