On Apr 3, 2009, at 7:10 AM, Anders Bjorn wrote:
Hi,
I'm trying to extract a histogram over the results from a bootstrap.
However
I keep receiving the error message Error in hist.default(boot.lrtest
$ll,
breaks = scott) : 'x' must be numeric.
The bootstrap I'm running looks like:
boot.test - function(data, indeces, maxit=20) {
+ y1 - fit1+e1[indeces]
+ mod1 - glm(y1 ~ X1-1, maxit=maxit)
+ y2 - fit2+e2[indeces]
+ mod2 - glm(y2~1, maxit=maxit)
+ ll - 2*(logLik(mod1)-logLik(mod2))
+ ll
+ }
boot.lrtest - boot(data=M1, statistic=boot.test, R=2000, maxit=100);
hist(boot.lrtest$ll, breaks=scott) # This results in the error
message
stated above
So my question is: what am I doing wrong?
At least two things, possibly 3 or 4:
1) not specifying from which package the function boot comes from,
and ..
2) not offering a reproducible example. and possibly ..
3) assuming that boot.lrtest$ll will have any meaning, with the
corollary..
4) not looking at boot.lrtest$ll with the str function.
Regarding 3), when I look at the documentation for boot in package
boot, I see no component of the value returned from a boot call that
has the name ll. The name ll will be thrown away after the
function call and you need to refer to components of the boot object
by the names that the developers used.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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