Nidhi Kohli wrote:
Hello All,
I'm trying to print specific row and column for Observed_Scores matrix, however, when I execute the
command "Observed_Scores[1,1]", I get the message "Error in Observed_Scores[1, 1] :
incorrect number of dimensions". Could you please help and let me know where is the mistake?
Here is my program:
library(ltm)
library(psych)
# Settting the working directory path to C:/NCME
path="C:/NCME"
setwd(path)
#IRT Data Simulation Routine#
n.exams = 500 #Sets number of examinees to be generated#
n.items = 20 #Sets number of items to be generated#
#The following intialize empty (NA) vectors or matrices#
beta.values = rep(NA,n.items)
resp.prob = matrix(rep(NA,n.exams*n.items),nrow=n.exams,ncol=n.items)
Observed_Scores = matrix(rep(NA,n.exams*n.items),nrow=n.exams,ncol=n.items)
#filling item parameters into beta.values
beta.values = runif(n.items,-2,2)
#Calculating Threshold
thresh.values = .5 * beta.values
#for (i in 1:10)
#{
#Using the function to generate the data
GenData <- congeneric.sim(N=500, loads = rep(.5,20), err=NULL, short = FALSE)
Observed_Scores = GenData[1]
Say
str(Observed_Scores)
and find that Observed_Scores is not a matrix but a list!
If you want to extract the matrix (first element of GenData), then use
Observed_Scores = GenData[[1]]
Uwe Ligges
Regards
Nidhi Kohli
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and provide commented, minimal, self-contained, reproducible code.
