[R] weird --no 'dimnames' attribute for array-- error for R lordif package

[David L Carlson]

You probably need to contact the lordif package maintainer:

Maintainer Seung W. Choi <s-choi at northwestern.edu>

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Debs Majumdar
> Sent: Tuesday, June 19, 2012 6:17 PM
> To: r-help at r-project.org
> Subject: [R] weird --no 'dimnames' attribute for array-- error for R
> lordif package
> 
> Hi All,
> 
>   I am trying to use the lordif package in R and can't figure out the
> reason for the above error when I try to run the calctheta() function.
> 
> 
> ##################
> # read data using foreign package - must be Stata 11 or earlier
> racedata<- read.dta("race.dta")
> 
> # item responses
> resp.data<-racedata[,-c(1:2)]
> 
> # grouping variable is in the second column
> af<-racedata[,2]
> 
> # run lordif
> >race.dif<-lordif(resp.data, af, criterion="Chisqr", alpha=0.05,
> minCell=1)
> >attributes(race.dif)
> >ipar1 <- race.dif$ipar
> > class(ipar1)
> [1] "data.frame"
> > class(resp.data)
> [1] "data.frame"
> 
> > head(ipar1)
>           a      cb1
> I1 2.565834 1.959045
> I2 2.033049 1.389847
> I3 2.693962 1.951471
> I4 1.772003 1.864188
> I5 3.478853 2.091705
> I6 1.479415 2.586945
> 
> > head(resp.data)
>   satis dropact empty bored spirits afraid
> 1   Yes      No    No    No     Yes     No
> 2   Yes      No    No    No     Yes     No
> 3    No     Yes   Yes   Yes      No     No
> 4   Yes      No    No    No     Yes     No
> 5   Yes      No    No    No     Yes     No
> 6   Yes      No    No    No     Yes     No
> 
> theta_race <- calctheta(ipar1, resp.data, seq(-4,4,.1),
> prior.mean=0,prior.sd=1)
> Error in t(pp[, i, resp]) : no 'dimnames' attribute for array
> 
> 
> What am I doing wrong here?
> 
> Thanks,
> 
> Debs
> 
> 
> ##################
> 
> 
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