steigerStat {conquestr} | R Documentation |
Function to cacluate the Steiger statistic. The Steiger statistic is a test of independance of the standardised residuals ((O-E)/sqrt(Var(E))), where Var(E) = p(x)/(1-p(x)).
steigerStat(myDat, q3Adj = TRUE, fisher = TRUE, dfAdj = FALSE, tpm)
myDat |
A data frame or matrix containing standardised residuals. |
q3Adj |
A bool indicating whether the Q3 correction should be applied. |
fisher |
A bool indicating whether the Fisher Transform should be applied. |
dfAdj |
A bool indicating whether the df should be adjusted for sample size, L, and targeting.
If dfAdj is TRUE, then you must pass in the optional argument |
tpm |
A number indicating the test-person match, where 0 indicates that mean item difficulty is equal to mean person ability, and -1 indcates that mean item difficulty is 1 logit below mean person ability. |
A list of class "steigerStat" with the Steiger Statistic, correlation matrix, and chi square test.