TestScores {psychometric}

Fictitious Test Scores for Illustrative Purposes

Description

These data were created to correspond to scores for 30 examinees on 10 items of test X plus a score on criterion Y.

Usage

data(TestScores)

Format

A matrix with 30 observations on the following 11 variables.

i1

item1 on test x

i2

item2 on test x

i3

item3 on test x

i4

item4 on test x

i5

item5 on test x

i6

item6 on test x

i7

item7 on test x

i8

item8 on test x

i9

item9 on test x

i10

item10 on test x

y

Score on criterion Y

Details

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.

See Also

item.exam

Examples

data(TestScores)
str(TestScores) 
item.exam(TestScores[,1:10], y = TestScores[,11], discrim=TRUE)
alpha(TestScores[,1:10])