convergenceplot {optical} | R Documentation |
Convergence plot
Description
Convergence plots displaying efficiency of design, violations of equivalence theorem, and alpha(Step length used) vs. iteration number. These plot are suitable for monitoring the convergence of optimal item calibration algorithm.
Usage
convergenceplot(yyy, refline = c(0.002, 1e-05))
Arguments
yyy |
|
refline |
reference line |
Details
Convergence plots have three panel.
-
First panel monitors efficiency of design vs. iteration number
-
Second panel monitors violations of equivalence theorem vs. iteration number
-
Third panel monitors step size used vs. iteration number
Value
A convergence plot is displayed.
See Also
Examples
# 2PL-models for two items; parameters (a, b)=(1.6, -1) and (1.6, 1), respectively
ip <- cbind(c(1.6, 1.6),c(-1, 1))
yyy <- optical(ip)
convergenceplot(yyy, refline=c(0.002, 0.001*0.005/0.45))
[Package optical version 1.7.1 Index]