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.
boot strapping poisson getting warnings and negative values
2 messages · Aravindhan, K, David Winsemius
On Nov 14, 2014, at 6:28 PM, Aravindhan, K <k-aravindhan1 at ti.com> wrote:
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]
I would imagine that the length of fit and of e[indices] would be different. Won?t generate an error that stops execute, but may create an error in evaluation.
mod<-glm(Y~X-1,family="poisson",maxit=maxit)
And if you are pulling X from ?outside? the bootstrapped function (and not adjusting it to reflect the indices), I cannot imagine good things should be expected.
coefficients(mod) } library(boot) db.fix.boot<-boot(db,boot.huber.fixed,2000,maxit=20)
And then there is the question of what ?db? really is. Furthermore, it doesn't seem that you are using any of that data-object in your bootstrapped function.
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:
If you wnat to construct a Y variable that is not integer then you need to use quasipoisson.
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. ______________________________________________ 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.
David Winsemius, MD Alameda, CA, USA