
Dear list, this might be a silly question, but I am a bit lost
 
I have bootstrapped the C-index of a logistic regression model, 500 times. 

> results <- boot(data=data,statistic=cindex,R=500,formula = myformula)
 
When I plot the results I get a histogram of the bootstrapped where the Y axis is density, but it spans from 0 to about 25
 
> plot(results)
 
Can
anyone help me interpret what the Y axis actually means in this
context? I thought it would range from 0 to 1. On another thread last
week ("hist returning density larger than 1") someone had a similar problem with hist() but I am not sure I can work out a solution from this. 

I would be very grateful if someone could help me on this.
 
> sessionInfo()
R version 2.8.1 (2008-12-22) 
i386-pc-mingw32 
 
locale:
LC_COLLATE=Spanish_Spain.1252;LC_CTYPE=Spanish_Spain.1252;LC_MONETARY=Spanish_Spain.1252;LC_NUMERIC=C;LC_TIME=Spanish_Spain.1252

attached base packages:
[1] splines   stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] boot_1.2-35     Design_2.1-2    survival_2.34-1 Hmisc_3.4-4    

loaded via a namespace (and not attached):
[1] cluster_1.11.11 grid_2.8.1      lattice_0.17-17



TIA,

Dave


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s. It's easy!

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