Re: [R] bootstrapping data.frame and matrix

Roger D. Peng Sat, 31 May 2003 03:21:33 -0700

The help page for `bootstrap' says that to bootstrap more complex statistics (it gives an example for the correlation), you need to bootstrap the (row) indices of the data frame and not the data frame itself. By the way, you appear to have the order of the arguments to bootstrap() incorrect but I guess this is a typo?

In general, I would suggest using the `boot' package from CRAN (along with the Davison & Hinckley book) instead of the `bootstrap' package. `boot' can work neatly on more general data structures and also uses the trick of bootstrapping the indices of the data rather than the data themselves.

Also, it appears you are using an old version of R because the the "_" operator is deprecated in the current version (1.7.0).

-roger

cp133 wrote:

Dear All,
When bootstrapping a statistics based on more than one vector, from a
data.frame or a matrix object, it looks like I am not able to pass the
data to R. What am I doing wrong?
I use the library "bootstrap".
Here is an example with a data.frame called "data"
"boot2_bootstrap(data, theta, nboot)

I get the following error message:
Error in inherits(x, "data.frame") : Argument "xdata" is missing, with
no default"
Please note that the same is happening when I create a matrix from the data.frame with the function cbind (i.e. names(data) [1] "shortrate" "y1" "y5" "y10" "y15" "y20" [7] "y25" xdata_cbind(data$y10,data$shortrate) is.matrix(x.data) TRUE)

Thanks in advance,

Chiara
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Re: [R] bootstrapping data.frame and matrix

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