• 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