[Rasch] One partial-credit item or multiple dichotomous items?

Eivind Kaspersen eivind.kaspersen at hist.no
Tue Mar 3 08:57:12 EST 2015

Hi. Wouldn't the second approach violate the local independence assumption? A score of 1 on the second item would definitely cause a score of 1 on item 1, or?

Eivind Kaspersen
Fra: rasch-bounces at acer.edu.au [rasch-bounces at acer.edu.au] på vegne av Stuart Luppescu [slu at ccsr.uchicago.edu]
Sendt: 2. mars 2015 22:42
Til: rasch at acer.edu.au
Emne: [Rasch] One partial-credit item or multiple dichotomous items?

Hello Fellow Raschies, I'm working on a test with some partial-credit
items. The coding is something like 0: Did not understand at all; 1:
Understood incompletely; 2: Understood completely.
I'm debating with the test developers about whether to make these
individual items scored {0, 1, 2} or two dichotomous items: item 1:
understood at least partially; item 2: understood completely. Is there
an advantage to using one or the other approach?
Also, if we go with the two-dichotomous-item approach, how should the
second item be scored if the student did not understand the question at
all? That is, does it make a difference if the two items are scored 0,
0; or 0, omitted?

Stuart Luppescu
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