plotMCC {conquestr} | R Documentation |
Creates a plot of an item characteristic curve (by response category). For a dichotomous item, this will
yield a single curve, for polytomous items this will produce a curve for each response category.
Note this is not for use with rout
files. See the generic function plotRout
for plotting rout files.
plotMCC(item, data, range = c(-6, 6), e_linetype = "bins", bins = 6)
item |
Item parameters for a single item. |
data |
Two vectors of data in an n by 2 matrix or data frame, where n are the cases in your analysis. The first vector should be item responses. the second vector should be estimated person abilities. |
range |
Lower and upper bounds to plot over (defaults to c(-6, 6) OR the minimum and maximum estimated ability, whichever is larger). |
e_linetype |
A string. Should the empirical lines be based on "bins", or "regression". Defaults to "bins" |
bins |
If _e\emphlinetype is "bins", how many bins should be used to chunk the empirical lines? defaults to 6. Ignored otherwise. |
A ggplot2 object.
myRout <- ConQuestRout()
myPlot <- plotRout(myRout)
## Not run:
# if you run the above example you will have an ICC plot in the object `myPlot`.
plot(myPlot)
## End(Not run)