View source: R/sd_identified_function.R
sd_identified | R Documentation |
sd_identified
calculates the standard deviation of the ability true
score distribution for identified students.
sd_identified( relyt = 1, test.cutoff, valid = 1e-07, nom.cutoff = 1e-07, mu = 0 )
relyt |
Confirmatory test reliability coefficient. Range (0, 1].
Must not be exactly 0. Defaults to 1; in this case, x is assumed
to be an observed score. If an alternative value is supplied for
|
test.cutoff |
Confirmatory test cutoff percentile. Range (0, 1). Must not be exactly 0 or 1. |
valid |
Nomination validity coefficient. Controls the relatedness of the nomination scores and the confirmatory test scores. Range (0, 1). Must not be exactly 0 or 1, and must be less than the square root of the test reliability. |
nom.cutoff |
Nomination cutoff percentile. Range (0, 1). Must not be exactly 0 or 1. |
mu |
Population mean true score on a standardized (z-score) metric. Defaults to zero. |
# std dev for true scores sd_identified( relyt = .9, valid = .8, test.cutoff = .9, nom.cutoff = .5, mu = 0 ) # std dev for observed scores 15 * (sd_identified( valid = .8, test.cutoff = .9, nom.cutoff = .5, mu = 0 ))
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