equating.rasch.jackknife.Rd
This function estimates the linking error in linking based on Jackknife (Monseur & Berezner, 2007).
equating.rasch.jackknife(pars.data, display=TRUE, se.linkerror=FALSE, alpha1=0, alpha2=0)
pars.data | Data frame with four columns: jackknife unit (1st column), item parameter study 1 (2nd column), item parameter study 2 (3rd column), item (4th column) |
---|---|
display | Display progress? |
se.linkerror | Compute standard error of the linking error |
alpha1 | Fixed \(\alpha_1\) parameter in the generalized item response model |
alpha2 | Fixed \(\alpha_2\) parameter in the generalized item response model |
A list with following entries:
Used item parameters
Used units for jackknife
Descriptives for Jackknife.
linkingerror.jackknife
is the estimated linking error.
Monseur, C., & Berezner, A. (2007). The computation of equating errors in international surveys in education. Journal of Applied Measurement, 8, 323-335.
For more details on linking methods see equating.rasch
.
############################################################################# # EXAMPLE 1: Linking errors PISA study ############################################################################# data(data.pisaPars) pars <- data.pisaPars # Linking error: Jackknife unit is the testlet vars <- c("testlet","study1","study2","item") res1 <- sirt::equating.rasch.jackknife(pars[, vars]) res1$descriptives ## N.items N.units shift SD linkerror.jackknife SE.SD.jackknife ## 1 25 8 0.09292838 0.1487387 0.04491197 0.03466309 # Linking error: Jackknife unit is the item res2 <- sirt::equating.rasch.jackknife(pars[, vars ] ) res2$descriptives ## N.items N.units shift SD linkerror.jackknife SE.SD.jackknife ## 1 25 25 0.09292838 0.1487387 0.02682839 0.02533327