Description Usage Arguments Details Value Author(s) See Also Examples
Classical Item Analysis for Polytomous Items
1 |
data |
a data frame with N rows and m columns, with N denoting the number of subjects and m denoting the number of items. |
options |
a vector of numerical code of the response categories available for the items such as c(0,1,2,3). The minumum score is assumed to be 0. |
ngroup |
number of score groups to be use for plotting the item trace lines |
correction |
TRUE or FALSE. If it is TRUE, then an adjustment is made for point-biserial correlation. |
to be added later
plots |
a list object storing the item trace line plots for each item |
Cengiz Zopluoglu
ITEMAN1
for classical item analysis of multiple-choice test items
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | data(timss2011_usa)
timss2011_usa$Q14B <- recode(var = timss2011_usa$Q14B,
recodes = "c(0)=3;c(1)=2;c(2)=1;c(3)=0")
timss2011_usa$Q14C <- recode(var = timss2011_usa$Q14C,
recodes = "c(0)=3;c(1)=2;c(2)=1;c(3)=0")
item.analysis <- ITEMAN2(data=timss2011_usa,
options=c(0,1,2,3),
ngroup=18,
correction=FALSE)
item.analysis$plots[[1]] # Item Trace Line for the first item
# item.analysis$plots[[2]] # Item Trace Line for the second item
# item.analysis$plots[[3]] # Item Trace Line for the third item
# item.analysis$plots[[4]] # Item Trace Line for the fourth item
# item.analysis$plots[[5]] # Item Trace Line for the fifth item
# item.analysis$plots[[6]] # Item Trace Line for the sixth item
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