MATLAB: How do you test ANOVA normality assumption

analysis of varianceanovaassumptionsMATLABnormalitynormality testshapiro-willink

How do you test the normality of the residuals in ANOVA? Is there also a way of plotting the residuals?

Best Answer

Hi Emanuele,

You can use the normplot function to obtain the normality plot of the residuals. This documentation page contains several tests for normality of residuals in ANOVA.

The link to the answer here can also be helpful in obtaining the residuals necessary for plotting.

Hope this helps!

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MATLAB: Question: probplot for changing confidence interval

probplot doesn't have any confidence interval. If you are trying to fit your data to a probability distribution, the demo Fitting a Univariate Distribution Using Cumulative Probabilities might help you.

MATLAB: HOW TO MAKE THAT AN INEQUALITY BECOME AN ASSUMPTION

Yes. Just be careful because once an assumption exists on a variable, using assume() for the same variable can delete the previous assumption. It is safer to use assumeAlso()

assume(x>0)
assumeAlso(x, 'integer')
assumeAlso(a+b-c>0)
assumeAlso(b+2*c<0)
assumeAlso(a>0)

You can also chain together assumptions in the form of relations:

assume(x, 'integer')
assumeAlso( x>0 & a+b-c<0 & b+2*c<0 & a>0)

However, the assumption system is not necessarily going to be robust enough for your purposes.

isAlways() might help you.

Best Answer

Related Solutions

MATLAB: Question: probplot for changing confidence interval

MATLAB: HOW TO MAKE THAT AN INEQUALITY BECOME AN ASSUMPTION

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