eqp.eq | R Documentation |
This function implements the equipercentile method of test equating as described in Kolen and Brennan (2004).
eqp.eq(sx, sy, X, Ky = max(sy))
sx |
A vector containing the observed scores on test |
sy |
A vector containing the observed scores on test |
X |
Either an integer or vector containing the values on the scale to be equated. |
Ky |
The total number of items in test form |
The function implements the equipercentile method of equating as described in Kolen and Brennan (2004). Given observed scores
sx
and sy
, the functions calculates
\varphi(x)=G^{-1}(F(x))
where F
and G
are the cdf of scores on test forms X
and Y
,
respectively.
A two column matrix with the values of \varphi()
(second column) for each scale value x
(first column)
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.
Kolen, M., and Brennan, R. (2004). Test Equating, Scaling and Linking. New York, NY: Springer-Verlag.
mea.eq
, lin.eq
, ker.eq
### Example from Kolen and Brennan (2004), pages 41-42:
### (scores distributions have been transformed to vectors of scores)
sx<-c(0,0,1,1,1,2,2,3,3,4)
sy<-c(0,1,1,2,2,3,3,3,4,4)
x<-2
eqp.eq(sx,sy,2)
# Whole scale range (Table 2.3 in KB)
eqp.eq(sx,sy,0:4)
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