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!
PROC UNIVARIATE has multiple tests for normality. None of the tests are very powerful, so I'll also look at the plots for an eyeball test.
PROC UNIVARIATE has multiple tests for normality. None of the tests are very powerful, so I'll also look at the plots for an eyeball test.
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
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;
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