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Asked: 2026-06-17T09:45:06+00:00

I am using the eRm package to run the dichotomous Rasch model. My problem

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I am using the eRm package to run the dichotomous Rasch model. My problem is that I can not manipulate the length of the x axis on the person-item map.

The description for the plotPImap command says to use xrange= to specify the range, but when I do so, I get the following error:

Error in xy.coords(x, y, xlabel, ylabel, log) : 
  'x' and 'y' lengths differ

Here is my code:

Model2 <- RM(EBL_MC)
plotPImap(Model2, xrange=c(-5:5), latdim = "Writing Achievement", main="Person-Item Map (EBL)")

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1 Answer

  1. Editorial Team

    This is just a shot in the dark, since you haven’t provided a reproducible example, but generally when functions in R ask for an axis range argument, they are looking for only two values, the low and high. Try xrange = c(-5,5).

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