[R] error message while running IRT model

Haillie
Mon, 18 Apr 2011 04:37:59 -0000

I have been struggling with the same problem for the past few hours and am
desperately in need of some help. The code I am running is as follows:

## opening a data set on the desktop
setwd("C:/Users/haillie/Desktop")
UN2010<- read.csv("UN2010.csv",header=TRUE)

##calling libraries
library(reshape)
library(car)

## these are the variables I want to recode
colname <- names(UN2010)


## this applies the recode functionto all the variable I want to recode
UN2010[colname] <-
   lapply(UN2010[colname],
       function(x) recode(x, recodes = "8=NA",
           as.factor.result = FALSE, as.numeric.result = TRUE))


UN2010frame<-data.matrix(lapply(UN2010,as.numeric))

ord.out1<-ordrating(UN2010, beta.constraint=1, tune=.035,
ma=1, mb=-5, vinva=1, vinvb=0.05,
gamma.start=c(-300, 0, 1.5, 3.0, 4.5, 300),
thin=20, burnin=20000, mcmc=100000, verbose=1000)


##########################################################
However, when i try to run the above ordrating code, an error message comes
up " NA/NaN/Inf in foreign function call (arg 24)." Because I
interpreted
this as that this model has no ability to perform na.omit, I did na.omit
myself using the code UN2010<-na.omit(UN2010). However, I encoutered another
problem then.

I recieved the below error messages this time..........................
Error in dimnames(x) <- dn :
  length of 'dimnames' [1] not equal to array extent
In addition: Warning messages:
1: In min(Y, na.rm = TRUE) :
  no non-missing arguments to min; returning Inf
2: In max(Y, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
3: In max(Y, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
>
##############################################################

I have tried everything I could but nothing has worked so far. Any advice or
help would be deeply appreciated. Thank you very much.

Haillie


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