Help using Base SAS procedures

How to calculate Chi Square test?

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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: 11,343

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)  
A1000
b1631.1655629.49382
c12.893.9632512.35552
d33.4276437.2905828.69669
e31.2585123.2570724.27262
f3.3532434.3235455.181347
Total100100100
Super User
Posts: 19,845

Re: Chi Square

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

Super User
Posts: 11,343

Re: Chi Square

That is also NOT 2x2 data.

Occasional Contributor
Posts: 5

Re: Chi Square

 200020012002
(PERCENTAGES)  
A0.10478900
B293129.9
c2.312.4
d333728.7
e312324.3
f345.2
Total100100100

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

Super User
Posts: 11,343

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: 19,845

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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