plot_ICC {autoRasch} R Documentation

## Plot The Item Characteristic Curves

### Description

This function plots the curve(s) of the estimated ability parameters against the probabilities of responses.

### Usage

plot_ICC(
obj,
itemno = 5,
xlab = NULL,
ylab = NULL,
xlim = c(-10, 10),
col = c("green4", "darkorange2", "red2"),
lty = c(1, 1, 1),
main = NULL,
...
)


### Arguments

 obj The object of class 'pcm'. itemno A number of the item that is wanted to be plot. xlab a title for the x axis. ylab a title for the y axis. xlim the x limits (x1, x2) of the plot. Note that x1 > x2 is allowed and leads to a ‘reversed axis’. The default value, NULL, indicates that the range of the finite values to be plotted should be used; see plot.default() col a vector of plotting colors lty a vector of line types. main String. Plot title. ... Further arguments to be passed.

### Value

There are no values to return. Instead, it plots the curve of item characteristics from the model.

### Examples

res <- pcm(short_poly_data)
plot_ICC(res, itemno = 4)



[Package autoRasch version 0.2.2 Index]