TestScores {psychometric} | R Documentation |
These data were created to correspond to scores for 30 examinees on 10 items of test X plus a score on criterion Y.
data(TestScores)
A matrix with 30 observations on the following 11 variables.
i1
i2
i3
i4
i5
i6
i7
i8
i9
i10
y
These data are constructed such that items 1 - 10 are coded 0,1 for incorrect/correct responses. The data illustate that some items are better for maintaining internal consistency, whereas others may be more useful for relating to external criteria.
data(TestScores) str(TestScores) item.exam(TestScores[,1:10], y = TestScores[,11], discrim=TRUE) alpha(TestScores[,1:10])