## How to calculate Chi Square test?

Occasional Contributor
Posts: 5

# How to calculate Chi Square test?

[ Edited ]

how to calculate Chi-squared 2x2 test (Fischer’s exact test, two-tailed) to get an p value using sas.

Super User
Posts: 13,583

## Re: Chi Square

Basic

Proc freq data=have;

tables var1*var2 / chisq fisher;

run;

Occasional Contributor
Posts: 5

## Re: Chi Square

how to calculate for below data

 (PERCENTAGES) A 10 0 0 b 16 31.16556 29.49382 c 12.89 3.96325 12.35552 d 33.42764 37.29058 28.69669 e 31.25851 23.25707 24.27262 f 3.353243 4.323545 5.181347 Total 100 100 100
Super User
Posts: 23,773

## Re: Chi Square

Chi-Square is for count data, you don't appear to have count data.

Super User
Posts: 13,583

## Re: Chi Square

That is also NOT 2x2 data.

Occasional Contributor
Posts: 5

## Re: Chi Square

 2000 2001 2002 (PERCENTAGES) A 0.104789 0 0 B 29 31 29.9 c 2. 3 12.4 d 33 37 28.7 e 31 23 24.3 f 3 4 5.2 Total 100 100 100

i need to calculate 2000 vs 2001;2001vs 2002 ...

Super User
Posts: 13,583

## Re: Chi Square

Do you have actual counts or possibly even better data with one record per observation?

You can get significantly different results comparing percentages when the percentages are the same but the group counts differ significantly.

Occasional Contributor
Posts: 5

## Re: Chi Square

this is the only  data availble ....

Super User
Posts: 23,773

## Re: Chi Square

Then you need to explain your question. You need the N's even if it's just the total and you back calculate the N based on percentages.

If you don't have N's you can calculate the variance and you can't do any tests.

There's a difference between tossing two coins and getting two heads versus tossing a coin 100 times and getting 100 heads.

Occasional Contributor
Posts: 5

## Re: Chi Square

 2000-2005 2006-2010 C 277 162 d 898 448

for this type of p value, you want to calculate a Chi-squared 2x2 test (Fischer’s exact test, two-tailed). So for example, for C, you would do…

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