Skip to content

Any help with bootstrapping

4 messages · Ivone Figueiredo, ~ DLC ~, Uwe Ligges +1 more

#
hello,
The distribution of your t* seems so asymmetric that the correction for 
the acceleration is big and extreme t* are selected as critical values 
of your CI. As BCa CI have the propriety of transformation invariance, 
a transformation of the scale makes no sense. (you could choose 
transformed bootstrap-t CI).
One possibility to avoid your problem with BCa Ci is to increase R, the 
number of replications. Try 1500 or more...
hope this help,
dlc
#
Ivone Figueiredo wrote:

            
Note that this is not an error, but a "just" warning. Can we assume you 
used boot() from package "boot"?

Uwe Ligges
#
This is not an error.  It is a warning.  I sometimes get it when there 
are aren't enough data or there aren't enough bootstrap iterations.

-roger
Ivone Figueiredo wrote: