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resampling
2009 Dec 30
1
boot function returns the same results every time - there appears to be not resampling of the original data.
...to learn how to use the boot function to perform a bootstrap of a regression. I have written a short trial program, shown below. Clearly I have done something wrong as the output of each of the 100 bootstrap values for the regression are exactly the same - there does not appear to be any bootstrap respampling!. What have I done wrong?
# Define function to be run. Function will return
# beta coefficeint for x.
fitter<-function(d)
{
fit1<-lm(y~x,data=d)
print(names(fit1))
print(summary(fit1))
summary(fit1)$coefficients[2,1]
}
# Define dataframe
x<-1:10
y<-x+rnorm(10)
d<-data.fram...