mdl object: put "F-statistic vs. constant model: ... , p-value = ..." into variable

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Evan
Evan 2015-8-20
评论： fateme 2022-1-9
fitlm() displays, among other things, the F-statistic and p-value for the fit as a whole. I can't find these values in the mdl object, however. Could someone point me to how I can find, or calculate this value using the data in the mdl object?

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回答（2 个）

gusjammo
gusjammo 2015-9-8
Hello Evan, I think that you may be able to do it with coefTest(mdl), although this defaults to a horizontal line along the x-axis, so you might have to override the default with the average y-value, for instance.
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fateme
fateme 2022-1-9
Hi the question is for long time ago but maybe this answer helps others. Yes as Gusjammo said based on the help of Matlab this works:
[p,F] = coefTest(mdl)
However for me,this function gives NaN inspite of showing values of p , F by typing 'mdl'.

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the cyclist
the cyclist 2015-8-20
I'm not sure it is very well documented, but if you type
mdl.
at the command line, you will see the list what is included in the model object.
The P-values are
mdl.Coefficients.pValue
or
mdl.anova.pValue
and the F-stat is
mdl.anova.F
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Evan
Evan 2015-8-20
编辑：Evan 2015-8-20
It is curious though that anova seems to be a property of the mdl object, yet it's not listed when you call the function properties(mdl)... Typing "mdl." in the command line for me just returns an error: "Error: Expression or statement is incomplete or incorrect."
the cyclist
the cyclist 2015-8-20
I misspoke when I said to enter "mdl." in the command window. What you should do is type "mdl." without hitting Enter, and then hit Tab to see the possible completions of that. Then you will see things like Coefficients, etc.

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