How to call ltm function using rpy package in python

Mohit Khanna mohit.personal1987 at
Tue Jan 8 11:29:31 CET 2013

I am trying the following code--

from rpy import *

dat= #some data frame or matrix

error coming is---
RPy_RException: Error in eval(expr, envir, enclos) : object 'dat' not found

Please tell me the right way to call ltm function using rpy library

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