Scores on two 20-items mathematics tests.

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Description

The data set contains raw sample frequencies of number-right scores for two parallel 20-items mathematics tests given to two samples from a national population of examinees. This data has been described and analized by Holland and Thayer (1989); Von Davier et al, (2004) (see also Von Davier, 2011 where other applications using these data set are shown).

Usage

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Format

A 21x2 matrix containing raw sample frequencies (raws) for two parallel tests (columns)

References

Holland, P. and Thayer, D. (1989). The kernel method of equating score distributions. (Technical Report No 89-84). Princeton, NJ: Educational Testing Service.

Von Davier, A., Holland, P., and Thayer, D. (2004). The Kernel Method of Test Equating. New York, NY: Springer-Verlag.

Examples

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data(Math20EG)
## maybe str(Math20EG) ; ...