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- How to test if a sample has a Normal Distribution?

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07-26-2013 11:07 AM

Hi,

I have a small Sample (with 30 points/observations) as variable "Sample" inside a Data Set named 'Data'.

I would like to know how to test if the this sample has a Normal Distribution.

Thanks!

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07-26-2013
11:35 AM

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07-26-2013 11:35 AM

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Solution

07-26-2013
11:35 AM

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07-26-2013 11:35 AM

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07-29-2013 02:38 PM

And if the sample size is large (N>100) the tests are over-powered, where even small deviations can lead to a significant result.

Follow Doc's advice and look at the plots, especially the pp and qq plots.

Steve Denham

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07-30-2013 01:41 PM

This should get you started:

ods graphics on;

PROC UNIVARIATE DATA=sashelp.iris(where=(Species="Virginica"));

VAR SepalLength;

histogram SepalLength / Normal;

qqplot SepalLength / Normal;

RUN;