plot.eirm | R Documentation |
This function creates a person-item map for an object returned from the eirm
function.
The function was modified from plotPImap
in package eRm.
## S3 method for class 'eirm' plot( x, difficulty = FALSE, sorted = TRUE, theta = NULL, main = "Person-Item Map", latdim = "Latent Dimension", pplabel = "Person\nParameter\nDistribution", cex.gen = 0.7, ... )
x |
An object returned from the |
difficulty |
Whether difficulty should be used instead of easiness (default: FALSE). |
sorted |
Whether the parameters should be sorted in the plot (default: TRUE). |
theta |
A vector of estimated theta values. If NULL, then theta values are obtained from the estimated eirm model. It might be better to save the theta values from a baseline model (e.g., Rasch) and use them when creating a person-item map. |
main |
Main title for the person-item map. |
latdim |
Label of the x-axis, i.e., the latent dimension. |
pplabel |
Title for the upper panel displaying the person parameter distribution. |
cex.gen |
A numerical value giving the amount by which plotting text and symbols should be magnified relative to the default. Here cex.gen applies to all text labels. The default is 0.7. |
... |
Other plot-related arguments. |
A person-item map.
data("VerbAgg") mod0 <- eirm(formula = "r2 ~ -1 + situ + btype + (1|id)", data = VerbAgg) plot(mod0) plot(mod0, difficulty = TRUE) # Plot difficulty instead of easiness
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