se.ln {equate} | R Documentation |
Computes the standard error of linear equating, under the random groups design, using an equation derived by Braun and Holland (1982).
se.ln(x, y)
x, y |
score distributions of class “freqtab ” for forms X and Y
|
This function is called by equate.ln
, where it is only applicable to the random groups equating design.
Returns a vector of standard errors of equating for each point in the scale
Anthony Albano tony.d.albano@gmail.com
Braun, H. I., & Holland, P. W. (1982). Observed-score test equating: A mathematical analysis of some ETS equating procedures. In P. W. Holland and D. B. Rubin (Eds.), Test Equating (pp. 9-49). New York: Academic.
xscale <- ACTmath[,1] x <- freqtab(ACTmath[,2],xscale,addclass=TRUE) y <- freqtab(ACTmath[,3],xscale,addclass=TRUE) se.ln(x,y)