PREp | R Documentation |
This function calculates the percent relative error as described in Von Davier et al. (2004).
PREp(eq, p)
eq |
An object of class |
p |
The number of moments to be calculated. |
PREp (when equating form X
to Y
) is calculated as
100*(μ_p(e_Y(X))-μ_p(Y))/μ_p(Y)
where μ_p(Y)=∑_k(y_k)^p*s_k and
μ_p(e_Y(X))=∑_j(e_Y(x_j))^p*r_j. Similar formulas can be found
when equating from Y
to X
.
A matrix containing the PREp for both X
to Y
(first column) and Y
to X
(second column) cases.
Jorge Gonzalez jorge.gonzalez@mat.uc.cl
Gonzalez, J. (2014). SNSequate: Standard and Nonstandard Statistical Models and Methods for Test Equating. Journal of Statistical Software, 59(7), 1-30.
Von Davier, A., Holland, P., and Thayer, D. (2004). The Kernel Method of Test Equating. New York, NY: Springer-Verlag.
ker.eq
#Example: Table 7.5 in Von Davier et al. (2004) data(Math20EG) mod.gauss<-ker.eq(scores=Math20EG,kert="gauss", hx = NULL, hy = NULL,degree=c(2, 3),design="EG") PREp(mod.gauss,10)
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