[R] help R IRT simulation

2010-03-03 Thread Helen Lisman
hello R, This is about simulation in psychomtrics in IRT in R. I want to simulate b parameters(item difficulty) with moments of fixed values of mean, st.d, skewness and kurtosis. Is there any specific IRT package in R with those functions to control those moments? I have seen other programs that

Re: [R] help R IRT simulation

2010-03-03 Thread Stuart Luppescu
On Wed, 2010-03-03 at 09:45 -0600, Helen Lisman wrote: hello R, This is about simulation in psychomtrics in IRT in R. I want to simulate b parameters(item difficulty) with moments of fixed values of mean, st.d, skewness and kurtosis. Is there any specific IRT package in R with those functions

Re: [R] help R IRT simulation

2010-03-03 Thread Dimitris Rizopoulos
to simulate from IRT models have a look at function rmvlogis() from package ltm. I hope it helps. Best, Dimitris On 3/3/2010 6:05 PM, Stuart Luppescu wrote: On Wed, 2010-03-03 at 09:45 -0600, Helen Lisman wrote: hello R, This is about simulation in psychomtrics in IRT in R. I want to

Re: [R] help R IRT simulation

2010-03-03 Thread Doran, Harold
this approach. -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Stuart Luppescu Sent: Wednesday, March 03, 2010 12:05 PM To: Helen Lisman Cc: r-help@r-project.org Subject: Re: [R] help R IRT simulation On Wed, 2010-03-03 at 09:45 -0600