mcIRT (version 0.41)

plot.nrm: Plotting an object of class nrm

Description

This plotting routine draws the Category Characteristic Curves (CCC) for each item.

Usage

"plot"(x, numbpoints = 100, fromto = c(-4, 4), ...)

Arguments

x

Commit an object of class 'nrm' which is a result of the nrm function.

numbpoints

A numerical vector of length 1, which denotes the number of points on the x-axis to draw the curves.

fromto

A numerical vector of length 2, which is about the same as xlim.

...

More arguments for plot.

See Also

nrm

Examples

## Not run: 
# 
# # Simulating 5 Items within a loop
# ParList <- lapply(1:5,function(x)
# {
#   Item1 <- c(c(-2,-1,1,2),c(-1.2,0.3,0.2,0.7))
#   names(Item1) <- c(paste("zeta",1:4,sep=""),paste("lamb",1:4,sep=""))
#   Item1
# })
# 
# names(ParList) <- paste("item",1:5,sep="")
# 
# # simulate person parameters
# perp1     <- rnorm(1500,0,1)
# 
# # simulate data.frame 
# sim.nrm.1 <- NRM.sim(ParList,perp1)
# 
# # reshape
# reshdat1 <- reshMG(sim.nrm.1,items=1:5,correct=rep(0,5))
# 
# # fit the nrm
# res.nrm <- nrm(reshdat1)
# 
# # finally the plot
# plot(res.nrm)
# 
# ## End(Not run)