R help - Jun 2012 - 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


##################

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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