[R] boot package

[Angelo Canty]

Hi Nathan,

sorry about the delay in responding.  

The test of whether all of the bootstrap values are equal is in the wrong 
place.  I will correct it in the next release.  Meanwhile, I think the 
simplest solution is to fix(boot.ci) and move the line

    if (const(t, min(1e-08, mean(t)/1e+06))) {
        print(paste("All values of t are equal to ", mean(t), 
            "\n Cannot calculate confidence intervals"))
        return(NULL)
    }

from its current position to directly after the line

    t <- t[fins]

boot.ci should then work properly for missing statistic values.

Angelo

On Sat, 4 Dec 2004, Nathan Leon Pace, MD, MStat wrote:

> Hi,
> 
> I using the boot package 1.2-20 on R 2.0.1.
> 
> My statistics function estimates 6 parameters.
> 
> In a small percentage of resampled data sets my statistics function 
> doesn't produce an estimate for one parameter and the boot function 
> stops with an error.
> 
> I can write an ifelse(exists('parameter.estimate'), parameter.estimate, 
> NA) statement within the statistic function to substitute an NA for the 
> missing estimate value.
> 
> However, the boot.ci function to generate CIs from the boot object 
> won't accept NAs.
> 
> My problem is writing code to impute a numeric value for the missing 
> estimate. ifelse won't generate a numeric value if the test is mode 
> logical.
> 
> Any suggestions?
> 
> Nathan
> 
> 
> Nathan Leon Pace, MD, MStat	Work:n.l.pace at utah.edu
> Department of Anesthesiology	Home:nlpaces at comcast.net
> University of Utah			Work:801.581.6393
> Salt Lake City, Utah			    Home:801.467.2925
> 					Fax:801.581.4367										Cell:801.558.3987
> 
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