why does R stepAIC keep unsignificant variables?

Why are the first 5 variables kept in the stepwise result?? 

I don't know, for your data set.

However, AIC is in my limited experience less likely to reject a term than rejection based on p-value at 95% confidence. It's not the same criterion, so there's no immediate reason it should give the same result.

And it often - quite correctly - doesn't.

S Ellison

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