[Rasch] rating scale and/or partial credit? or my wrong hunch?

Shirin Shirazi shirin.shirazi at gmail.com
Sat Oct 3 23:13:07 AEST 2015


Thanks Dr Bond,

You are totally right but I have not developed the scale. You surely
remember, I am after objectivity, to the extent possible.

Great Regards,

Shirin

On Sat, Oct 3, 2015 at 12:33 PM, Bond, Trevor <trevor.bond at jcu.edu.au>
wrote:

> Dear Shirin,
> It is always better to use original data, rather than any conflation of
> them.
> TGB
>
>
> Sent from 007's iPad
>
> On 3 Oct 2015, at 5:58 AM, Shirin Shirazi <shirin.shirazi at gmail.com>
> wrote:
>
> Dear List Members,
>
>
> First, after a week of hard work, I would say "great job". Have a
> memorable weekend.
>
>
> Then, I doubt that is there any possibility to Rasch-analyze essays
> considering both rating scale and partial credit? See, I have not recently
> looked at Test of written English (TOEFL iBT) scoring which is reported
> 0-30 in range but actually it has also some qualitatively-based rubrics:
> 1-16 limited 17-23 fair and 24-30 good. When it comes to Facets, is it
> alright to take it as a major facet, say ratings, then naming them R30,
> limited  A, fair, B, and good, C or is it OK to write just the model,
> R30; observations are ratings in range 0-30 without further elaboration?
>
>
> Something that is baffling is they are not items with the total of 30;
> besides, they are scales since they are ranging between 0-5 then scaled
> into 0-30; then they are divided into three different bands: limited, fair,
> good?
>
>
> Your comments are highly welcome.In advance, I appreciate your invaluable
> comments as always have been .
>
>
> Great Regards,
>
>
> Shirin
>
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