help with ltm package

Andrew -

Your error message suggests that you don't have msm package on your system, which appears to be a dependency for ltm (look at the very last line of the error message).

An easy check would be to type:

library() 

in the console and see if msm is in your list of packages.

If not, download/install that, and try again.

Best wishes,
Andrew

on my macbook, R won't run ltm package, it keeps telling me this:

library(ltm)

Loading required package: MASS
Loading required package: msm
Error: package 'msm' could not be loaded
In addition: Warning message:
In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc = lib.loc) :
 there is no package called 'msm'

please help

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