Fisher'S Exact Test And Odds Ratio
1
1
Entering edit mode
9.7 years ago
Diana ▴ 20

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 • 8.7k views
ADD COMMENT
2
Entering edit mode

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

ADD REPLY
5
Entering edit mode
9.7 years ago
Neilfws 49k

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 COMMENT
1
Entering edit mode

thanks, that PDF is very informative.

ADD REPLY

Login before adding your answer.

Traffic: 2702 users visited in the last hour
Help About
FAQ
Access RSS
API
Stats

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

Powered by the version 2.3.6