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From: [EMAIL PROTECTED] on behalf of Dan Powers
Sent: Sun 10/1/2006 10:15 PM
To: 'R-Help'
Subject: [R] multilevel factor model in lmer
Hello --
I am curious if lmer can be used to fit a multilevel factor model such as a
two-parameter item response model. The one parameter model is
straightforward
: Monday, October 02, 2006 12:22 PM
Subject: Re: [R] multilevel factor model in lmer
Dan:
lmer cannot currently be used for the 2PL. As you note, it is
straightforward to estimate the 1PL, but the a-parameters present a
current challenge. Doug mentioned to me the other day he is doing
some
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-Original Message-
From: Dimitris Rizopoulos [mailto:[EMAIL PROTECTED]
Sent: Monday, October 02, 2006 6:05 AM
To: Doran, Harold; [EMAIL PROTECTED]; R-Help
Cc: [EMAIL PROTECTED]
Subject: Re: [R] multilevel factor model in lmer
If you just want to fit the 2PL, without any covariates, then this can
Hello --
I am curious if lmer can be used to fit a multilevel factor model such as a
two-parameter item response model. The one parameter model is
straightforward. A two-factor model requires a set of factor loadings
multiplying a single random effect. For example, a logit model for the ith
