Math20SG: Bivariate score frequencies on two 20-items mathematics tests.
Description
The data set contains the bivariate sample frequencies of number-right scores
for two parallel 20-items mathematics tests given to a sample from a national population of
examinees. This data has been described and analized by Holland and Thayer (1989);
Von Davier et al, (2004).
Usage
data(Math20SG)
Arguments
format
A 21x21 matrix containing the bivariate sample frequencies for $X$ (raws) and $Y$
(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.