1
$\begingroup$

I am trying to do statistical analysis for a user survey. The total number of survey to be analysed is 59. The variables in the survey can be defined as a categorical variable. Some of the contingency tables for the survey looks as follows:

2   1
11  13
0   32

11  9   1
14  23  1

13  7
23  15

I am confused regarding whether to use fisher test or chi square test? As not all the tables are of 2*2 matrix, as well as some of the tables have expected values of less than 5. (The total number of responses vary in each table).

If I have to use fisher test, I use F-Test Two-Sample for Variances in excel. The solution by that method gives the following terms. What does these term mean?

F
P(F<=f) one-tail
F Critical one-tail

At last, when can I reject null hypothesis in excel.

$\endgroup$
  • 3
    $\begingroup$ "If I have to use fisher test, I use F-Test Two-Sample for Variances in excel." -- I'm sorry, this makes no sense at all. Why would you do a two sample test for variances? You said you wanted to do a Fisher test (i.e. a Fisher exact test for contingency tables). They're not at all the same thing. $\endgroup$ – Glen_b Dec 20 '15 at 10:14
  • $\begingroup$ There are several posts about Fisher vs $\chi^2$, such as this one. According to @FrankHarrell, the "$\geq 5$" requirement is a myth. There are other ones in the list of related posts at right of your post. $\endgroup$ – Stéphane Laurent Dec 20 '15 at 12:58
1
$\begingroup$

To solve yours problems with performing independence test in Excel I recommend you this two links:

http://www.real-statistics.com/chi-square-and-f-distributions/independence-testing/

http://www.real-statistics.com/chi-square-and-f-distributions/fishers-exact-test/

If you're using Fisher's Exact Test, you should define whether to use one-tailed or two-tailed test. The clear explanation (with online calc for FET) is here: http://quantpsy.org/fisher/fisher.htm

To get to know the theory behind this test, I would rather recommend readinng at least some chapters from http://www.biostathandbook.com/ , particularly:

  1. http://www.biostathandbook.com/chiind.html
  2. http://www.biostathandbook.com/fishers.html
  3. http://www.biostathandbook.com/small.html
$\endgroup$
  • $\begingroup$ @Punit Gandhi Does this solve your problem? Do you manage to perform Fisher's Exact Test in Excel or do you have further issues with that? $\endgroup$ – Adam Przedniczek Dec 22 '15 at 15:31

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.