[R] boot strapping poisson getting warnings and negative values

[Aravindhan, K]

Team,
Has anyone looked at this question from me ?  it will help me immensely if someone can provide an answer to this.

Thanks
Aravindhan

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of K Aravindhan
Sent: Friday, August 08, 2014 7:42 PM
To: r-help at r-project.org
Subject: [R] boot strapping poisson getting warnings and negative values

Dear Team,
I am getting this error while running the boot-strapping functions. 

==================================================
mod.db.hub<-glm(TOTAL~1+IPD,family="poisson",data=db)
fit<-fitted(mod.db.hub)
e<-residuals(mod.db.hub)
X<-model.matrix(mod.db.hub)
boot.huber.fixed<-function(data,indices,maxit=20) { Y<-fit+e[indices]
mod<-glm(Y~X-1,family="poisson",maxit=maxit)
coefficients(mod)
}
library(boot)
db.fix.boot<-boot(db,boot.huber.fixed,2000,maxit=20)
db.fix.boot
boot.ci(db.fix.boot,index=1,type=c("bca","perc","poisson"))
boot.ci(db.fix.boot,index=2,type=c("bca","perc","poisson"))
==================================================

Error in eval(expr, envir, enclos) : 
negative values not allowed for the 'Poisson' family In addition: Warning messages:
1: In dpois(y, mu, log = TRUE) : non-integer x = 25.006412
2: In dpois(y, mu, log = TRUE) : non-integer x = 26.969411
3: In dpois(y, mu, log = TRUE) : non-integer x = 66.352323
4: In dpois(y, mu, log = TRUE) : non-integer x = 61.083519
5: In dpois(y, mu, log = TRUE) : non-integer x = 20.596770
6: In dpois(y, mu, log = TRUE) : non-integer x = 43.428258
7: In dpois(y, mu, log = TRUE) : non-integer x = 1108.263554
8: In dpois(y, mu, log = TRUE) : non-integer x = 61.937982
9: In dpois(y, mu, log = TRUE) : non-integer x = 419.991213
10: In dpois(y, mu, log = TRUE) : non-integer x = 47.369133

Can you explain to me how to get rid of these ?

Thanks
Aravindhan

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.