Hello ,

I want to compare two quadratic regression models with non-parametric
bootstrap.
However, I do not know which R package can serve the purpose,
such as boot, rms, or bootstrap, DeltaR.
Please kindly advise and thank you.

Elaine

The two quadratic regression models are

y1=a1x^2+b1x+c1

y1= observed migration distance of butterflies()

y2=a2x^2+b2x+c2

y2= predicted migration distance of butterflies (based on body mass)

x= body mass of butterflies


null hypothesis: a1=a2 and b1=b2 and c1=c2

bootstrap to test if the coeffients (a, b, c) of the y1 and the y2 model
differ

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