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Why are pValue and FStat 'NaN'?

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Amend
Amend 2015-3-30
编辑： Amend 2015-3-30
I am new to statistic tool.
1). I use "stepwiselm(ds1,'poly1432')" to perform regression and got some results like:
Removing a:(aw^3), FStat = NaN, pValue = NaN
and Estimate, Se, tStae and pValue in "Estimated Coefficients" are positive numbers which are less than 1.
2) I use "fitlm(ds1,'poly1322')", and got "Estimated Coefficients" like:
Estimate SE tStat pValue
_________ __ _____ ______
(Intercept) 0 0 NaN NaN
a 0 0 NaN NaN
aw 0 0 NaN NaN
What does "NaN" mean? who can explain? Thank you very much

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