Hi,
statistically the heavier the negative weighting the better the distinction
between the 'good' and the 'bad' students,
any weighting less than -2.0 for 'true/false' or -0.5 for 'one from five'
answers promotes guessing and reduces the validity of the test,
in other words, more marks should be deducted for a wrong answer than added
for a correct answer,
our software allows for variable negative marking,
Martin Schranz
www.mcqs.com
[log in to unmask]
----- Original Message -----
From: Karel RIHA <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 20, 2000 5:49 PM
Subject: Re: negative marking (?a new twist)
> Hi,
> This is all rather old hat.
> QMark has had this feature (it has to be set up for each question) since
we
> have been using it from 1995. And yes, we do occasionally get negative
> total results when unlucky guessers take the test.
> Regds, Karel Riha
>
> > Hello
> >
> > Forwarded message from Chris Rust at Oxford Brookes.
> >
> > >> >
> > >> >I have a colleague, Peter Grebenik, who is using negative marking
> > >> >for MCQ tests, but rather than taking the same value off for each
> > >> >question attempted and wrongly answered he has developed a sliding
> > >> >scale based on what he calls the Guess Ratio for each candidate
> > >> >(wrong answers divided by attempted answers multiplied by the
> > >> >Failure Expectation value - if there are five possible answers and
> > >> >only one is right the FE would be 0.8). He works on the basis
> > >> >that
> > >> > he wants someone who always guesses to get nought so that would
> > >> > require -0.25
> > >> >per question. So for each candidate the amount deducted for each
> > >> >wrong answer is 0.25 x the candidate's Guess Ratio, so the penalty
> > >> >rises with the degree of guessing.
> > >> >
> > >> >My colleague asked me if I knew of anything similar already in
> > >> >existence and/or in the literature. I said I didn't but I knew a
> > >> >mailbase that probably would! Anyone????
> > >> >
> > >> >Best wishes
> > >> >Chris Rust
> > >> >
> > >>
> >
> > Dr Joanna Bull
> > Head of Teaching and Learning Research
> > Project Manager, CAA Centre
> >
> > Teaching and Learning Directorate
> > D001
> > University of Luton
> > Park Square
> > Luton
> > LU1 3JU
> >
> > Tel: 01582 489185 (Direct)
> > Tel: 01582 734111 ext: 2485
> > Fax: 01582 743400
> >
> > http://caacentre.ac.uk
>
>
> ---------------------
> Karel Riha
> School of Information Systems
> Kingston University
>
>
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