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s1df
2007 Jan 19
1
ability estimate with GRM of IRT
...e("P1.csv",header=TRUE,sep=",")
library(ltm)
2) I created a subset that included columns 2 to 9 for the
analysis by doing:
s1<-p1[,2:9]
3) I converted the subset into data.frame format by doing:
s1df=data.frame(s1)
4) I checked the descriptive stats for the s1df by doing:
ds1df=descript(s1df)
ds1df
And it was confirmed that 242 subjects' responses were imported.
5)I ran GRM on the s1df dataset by doing:
grm<-grm(s1df, Hessian=T)
grm
6)Finally, I ran the ability estimated by doing:
aes1=factor.scores(grm)
aes1
And I got 183 factor-scores for observed response pa...