equate (version 0.1-1)

se.ln: Standard Error of Linear Equating

Description

Computes the standard error of linear equating, under the random groups design, using an equation derived by Braun and Holland (1982).

Usage

se.ln(x, y)

Arguments

x, y

score distributions of class freqtab for forms X and Y

Value

• Returns a vector of standard errors of equating for each point in the scale

Details

This function is called by equate.ln, where it is only applicable to the random groups equating design.

References

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.

See Also

equate.ln

Examples

xscale <- ACTmath[,1]
x <- freqtab(ACTmath[,2],xscale,addclass=TRUE)
y <- freqtab(ACTmath[,3],xscale,addclass=TRUE)
se.ln(x,y)