R help - Feb 2004 - Any help with bootstrapping

Could someone help me on how to correctly try to correct this error
message
 
arning : BCa Intervals used Extreme Quantiles
Some BCa intervals may be unstable
Warning message: 
Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha)
 
Regards
IF

	[[alternative HTML version deleted]]

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
> Could someone help me on how to correctly try to correct this error
> message
>
> arning : BCa Intervals used Extreme Quantiles
> Some BCa intervals may be unstable
> Warning message:
> Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha)
>
> Regards
> IF
>

Ivone Figueiredo wrote:
> Could someone help me on how to correctly try to correct this error
> message
>  
> arning : BCa Intervals used Extreme Quantiles
> Some BCa intervals may be unstable
> Warning message: 
> Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha)
>  
> Regards
> IF
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:
> Could someone help me on how to correctly try to correct this error
> message
>  
> arning : BCa Intervals used Extreme Quantiles
> Some BCa intervals may be unstable
> Warning message: 
> Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha)
>  
> Regards
> IF
> 
> 	[[alternative HTML version deleted]]
> 
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