View source: R/transformToBista.R
transformToBista | R Documentation |
Function uses output of equat1pl
to provide two data.frames,
one for the item parameters on the bista metric and one for the person parameter
(PVs) on the bista metric.
transformToBista ( equatingList, refPop, cuts, weights = NULL, defaultM = 500,
defaultSD = 100, q3bound= .2, roman = FALSE, vera = TRUE,
idVarName = NULL, years=NULL)
equatingList |
The object returned by |
refPop |
Optional: Data frame with at least three columns. First column indicates the domain name.
Note that this name must match the domain names in the output of |
cuts |
A named list with cut scores. Names of the list must match the domain names in the
output of |
weights |
Optional: a data.frame with two columns, first column is person identifier, second
columns is individual caseweight. Necessary for the transformation of linking
error for (ordered) factors and/or if descriptives of the reference population
should be computed directly from the data. See the examples of |
defaultM |
Mean of the reference population on the “bista” metric. |
defaultSD |
Standard deviation of the reference population in the “bista” metric. |
q3bound |
Define the absolute boundary of Q3 values which should be captured in the item parameter list according to the guidelines of the “Vergleichsarbeiten”. |
roman |
Logical: Use roman numbers for competence level column in the shortened item parameter table dedicated for the “Vergleichsarbeiten”? |
vera |
Logical: Prepare item parameter list according to the guidelines of the “Vergleichsarbeiten”? |
idVarName |
Optional: character vector of individual student id. This is only to provide compatibility with older package versions. Specification of this argument is only necessary if the function gives an error. |
years |
Optional: numeric vector with two elements, indicating the both years of assessment. Only necessary if additional linking error object should be created. |
A list with three data frames: the first one contains original and transformed item parameters and competence levels. The second one contains original and transformed person parameters and competence levels. The third one contains transformation information.
Sebastian Weirich
# see example 5, 6, and 6a in the help file of defineModel()
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