[Rasch] Disordered thresholds and collapsing (on behalf of Anthony James)

Jorge González jgonzale at mat.puc.cl
Thu Nov 29 01:47:55 EST 2012

Please take a look to this paper 
Kind regards,


El 22/11/2012 09:36 a.m., Thomas Salzberger escribió:
> ---------- Forwarded message ----------
> From: Anthony James <luckyantonio2003 at yahoo.com>
> Date: 2012/11/22
> Subject: Re: Fw: Disordered thresholds and collapsing
>   Dear all,
> In 3PL-IRT model guessing is an item parameter.
> This means that some items are more prone to guessing and some less.
> But it seems to be more logical to consider guessing a characteristic
> of persons. Some people have more tendency to guess and some less.
> How guessing parameter is interpreted in 3PL?
> Are person and item parameters adjusted for guessing in 3-PL?
> I mean do person, item, and discrimination parameters change if data
> are modeled with 3-PL compared with 2PL and 1PL?
> Cheers
> Anthony
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