Facing an error while using 'anovan' function

Hello,

I am facing a problem using 'anovan' function. I used the code that is very similar to the example in the help section of Mathworks and it shows the error 'NAN' when calculating p-values. I'm not sure where is the source of this error although it's similar to the example. I am attaching the Excel sheet that contains the code and Matlab result.

I appreciate your clarification on this issue.

Best Regards,

Answer 1

[Jeff Miller]

anovan needs the original data (y1 and y2) to compute an error term, but you are only giving it the averages (ybar). This is why you have 0 df for error and Inf F + nan Probs.

To fix the problem, make a y12 array with y1 followed by y2, and then correspondingly make your A, B, and C vectors twice as long. Then give anovan y12 instead of ybar.