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 wrote a code for step 1 and got a error message. Please kindly advise how to modify it and thank you. Elaine code require(boot) function.fit2 <- function(data){ #data <- data[indices,] # select obs. in bootstrap sample fit2 <-lm(logDIS~logBMN+I(logBMN^2)) coefficients(fit2) # return coefficient vector } boot.fit2 <- boot(dataN, function.fit2, 1000) error > fit2.boot <- boot(dataN, fun.fit2, 1000) Error in statistic(data, original, ...) : unused argument (original) [[alternative HTML version deleted]]
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