eqc | R Documentation |
eqc
is a generic function which extracts the equating coefficients.
eqc(x, ...) ## S3 method for class 'eqc' eqc(x, ...) ## S3 method for class 'eqclist' eqc(x, link = NULL, ...) ## S3 method for class 'ceqc' eqc(x, ...) ## S3 method for class 'ceqclist' eqc(x, link = NULL, path = NULL, ...) ## S3 method for class 'meqc' eqc(x, link = NULL, path = NULL, ...)
x |
object of the class |
link |
a character string with the names of the two forms being linked separated by a dot (e.g. " |
path |
a character string with the names of the forms that constitute the path separated by a dot (e.g. " |
... |
further arguments passed to or from other methods. |
A data frame containing the equating coefficients for every link and path.
Michela Battauz
alldirec
, bisectorec
, chainec
, direc
# two-parameter logistic model data(est2pl) test<-paste("test", 1:5, sep = "") mod2pl <- modIRT(coef = est2pl$coef, var = est2pl$var, names = test, display = FALSE) # direct equating coefficients between forms 1 and 2 using the Haebara method l12 <- direc(mods = mod2pl, which = c(1,2), method = "Haebara") # all direct equating coefficients using the Haebara method direclist2pl <- alldirec(mods = mod2pl, method = "Haebara") # compute all chain equating coefficients of length 3 chainec3 <- chainec(r = 3, direclist = direclist2pl) # compute chain equating coefficients for path 1,2,3,4 pth1 <- paste("test", 1:4, sep = "") chainec1 <- chainec(direclist = direclist2pl, pths = pth1) # compute chain equating coefficients for path 1,5,4 pth2 <- c(paste("test", c(1,5,4), sep = "")) chainec2 <- chainec(direclist = direclist2pl, pths = pth2) # create a list of objects of class ceqc ecall <- c(chainec1, chainec2) # compute bisector and weighted bisector coefficients allec <- bisectorec(ecall = ecall, weighted = TRUE, unweighted = TRUE) # extract equating coefficients eqc(l12) eqc(direclist2pl) eqc(direclist2pl, link = "test1.test2") eqc(chainec3) eqc(chainec3, link = "test1.test3") eqc(allec) eqc(allec, path = "bisector")
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