Shapiro Wilk normality test

[nlpurumi]

Thanks again for your reply. I will try to figure out how to draw qq plot. I am a beginner in SAS, so everything is so new to me.

However, if I have a better figure, do you think I would know this is non-normal distribution?

Also, I have another question for you.

I vaguely remembered that I should run normality test not on dependent variable but on residual.

Now my question is this how is the "outp=R" command different from "residual" command in following statement?

"model apathy=time intervention time*intervention /residual;"

[Reeza]

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@nlpurumi wrote:

Thanks again for your reply. I will try to figure out how to draw qq plot. I am a beginner in SAS, so everything is so new to me.

However, if I have a better figure, do you think I would know this is non-normal distribution?

Also, I have another question for you.

I vaguely remembered that I should run normality test not on dependent variable but on residual.

Now my question is this how is the "outp=R" command different from "residual" command in following statement?

"model apathy=time intervention time*intervention /residual;"

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The assumption for linear regression is that the residuals are normal not the covariates. I suggest looking up the documentation for PROC UNIVARIATE to see what commands are available - it does the qq plots automatically. 

[nlpurumi]

Thank you. I will search the link you shared the other day. Thanks a lot!!

[Reeza]

And remember the SAS Statistics 1 e-course is completely free and covers a lot of what you're attempting here with the first few chapters.

Good Luck.

[nlpurumi]

I see. Thank you for your help and advice!