topic Chi-Square test for One Pop. Variance in SAS Programming

Chi-Square test for One Pop. Variance

ralphbenno — Sat, 09 Feb 2019 16:08:10 GMT

I need to calculate Chi-Square test for One Pop. Variance

my data is Ho variance less 25 h1 variance larger than 25 sample deviation= 9.98

I do not know which sas code to use to get the chi square

Re: Chi-Square test for One Pop. Variance

PaigeMiller — Sat, 09 Feb 2019 16:49:03 GMT

The formula for the chi-square test is given here: https://www.real-statistics.com/chi-square-and-f-distributions/one-sample-hypothesis-testing-variance/

You would program this in a SAS data step, using the CDF function (actually, I think you need 1-CDF), as shown here.

https://documentation.sas.com/?docsetId=ds2ref&docsetTarget=p1ae695babuvmun12d1whd5wn3dv.htm&docsetVersion=9.4&locale=en

Re: Chi-Square test for One Pop. Variance

ralphbenno — Sat, 09 Feb 2019 17:11:15 GMT

I would like to see the SAS code

the data is 20 observations

I believe that in SAS you use the proc freq command

can you provide me with the code

thank you

Re: Chi-Square test for One Pop. Variance

Reeza — Sun, 10 Feb 2019 00:39:29 GMT

PROC FREQ does Chi Square tests for categorical data, this is not what you have. You're testing the variance for a continuous distribution, but the test statistic has a Chi Square distribution. PROC FREQ is not the correct procedure here.

Here's an example on calculating the CI for the STD and Variance, which can help you with your hypothesis testing.

https://documentation.sas.com/?docsetId=procstat&docsetTarget=procstat_univariate_examples09.htm&docsetVersion=9.4&locale=en

For the Chi-Square Test specifically, you can use the VarTest macro here:

https://support.sas.com/kb/25/024.html

@ralphbenno wrote:

I need to calculate Chi-Square test for One Pop. Variance

my data is Ho variance less 25 h1 variance larger than 25 sample deviation= 9.98

I do not know which sas code to use to get the chi square

Re: Chi-Square test for One Pop. Variance

ralphbenno — Sun, 10 Feb 2019 03:01:36 GMT

the answer given does not work for Ha variance less than 25. the macro does not work.

I need sas code for doing chi-square test for one population variance.

thank you

Re: Chi-Square test for One Pop. Variance

Reeza — Sun, 10 Feb 2019 03:09:42 GMT

Post the full code you ran. I tested it before answering and it worked fine.