Hello,
I want to know if two quadratic regressions are significantly different.
I was advised to make the test using
step 1 bootstrapping both quadratic regressions and get their slope
coefficients.
(Let's call the slope coefficient *â*^1 and *â*^2)
step 2 use the slope difference *â*^1-*â*^2 and bootstrap the slope
coefficent
step 3 find out the sampling distribution above and calculate the % =0
step 4 multiple the % by 2
However, I am new to the package boot.
I finished writing code for step 1 as below.
Please kindly advise how to code step 2 and 3.
Thank you.
Elaine
code
require(boot)
function.fit2 <- function(data,i){
d <- data[i,] # select obs. in bootstrap sample
fit2 <-lm(logDIS~logBMN+I(logBMN^2), data=dataN)
coefficients(fit2) # return coefficient vector
}
boot.fit2 <- boot(dataN, function.fit2, 1000)
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