* using log directory 'd:/Rcompile/CRANpkg/local64/2.11/lordif.Rcheck'
* using R version 2.11.1 Patched (2010-07-29 r52657)
* using session charset: ISO8859-1
* checking for file 'lordif/DESCRIPTION' ... OK
* checking extension type ... Package
* this is package 'lordif' version '0.1-7'
* checking package name space information ... OK
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking whether package 'lordif' can be installed ... OK
* checking package directory ... OK
* checking for portable file names ... OK
* checking DESCRIPTION meta-information ... OK
* checking top-level files ... OK
* checking index information ... OK
* checking package subdirectories ... OK
* checking R files for non-ASCII characters ... OK
* checking R files for syntax errors ... OK
* checking whether the package can be loaded ... OK
* checking whether the package can be loaded with stated dependencies ... OK
* checking whether the package can be unloaded cleanly ... OK
* checking whether the name space can be loaded with stated dependencies ... OK
* checking whether the name space can be unloaded cleanly ... OK
* checking for unstated dependencies in R code ... OK
* checking S3 generic/method consistency ... OK
* checking replacement functions ... OK
* checking foreign function calls ... OK
* checking R code for possible problems ... OK
* checking Rd files ... OK
* checking Rd metadata ... OK
* checking Rd cross-references ... OK
* checking for missing documentation entries ... OK
* checking for code/documentation mismatches ... OK
* checking Rd \usage sections ... OK
* checking Rd contents ... OK
* checking data for non-ASCII characters ... OK
* checking examples ... ERROR
Running examples in 'lordif-Ex.R' failed.
The error most likely occurred in:

> ### * lordif-package
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: lordif-package
> ### Title: LOgistic Regression Differential Item Functioning using IRT
> ### Aliases: lordif-package
> ### Keywords: package
> 
> ### ** Examples
> 
> ##load PROMIS Anxiety sample data (n=766)
>   data(Anxiety)
> ##age : 0=younger than 65 or 1=65 or older
> ##gender: 0=Male or 1=Female
> ##education: 0=some college or higher 1=high school of lower
> ##run age-related DIF on all 29 items (takes about a minute)
>   age.dif <- lordif(Anxiety[paste("R",1:29,sep="")],Anxiety$age) 
Iteration 1 : 5 items flagged for DIF (7,9,11,18,24)
Iteration 2 : 4 items flagged for DIF (9,11,18,24)
Iteration 3 : 4 items flagged for DIF (9,11,18,24)
> ##print output
> ##print(age.dif)
> ##print extended output
> ##summary(age.dif)
> ##generate plots for DIF items (reference group: <65)
> ##plot(age.dif,labels=c("Younger","Older")) 
> ##run Monte Carlo simulations for threshold values
> ##this may take several minutes
>   age.dif.MC<-montecarlo(age.dif,alpha=0.05,nr=100)
Start time: Thu Oct 14 17:34:50 2010 

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Error in lrm(rv ~ ev * gr) : Unable to fit model using "lrm.fit"
Calls: montecarlo -> rundif -> runolr -> lrm
Execution halted