[Forum SIS] Seminario Joseph B. Lang

[manuela cazzaro]

Annuncio di seminario:

A RANDOMIZATION P-VALUE TEST FOR DETECTING
COPYING ON MULTIPLE-CHOICE EXAMS

Joseph B. Lang
University of Iowa - Department of Statistics and Actuarial Science -

Abstract
This talk is concerned with the statistical detection of copying on
multiple-choice exams.
As an alternative to existing permutation- and model-based copy-detection
approaches,
a very simple randomization p-value (RP) test is proposed. The RP test,
which is based
on an intuitive match-score statistic, makes no assumptions about the
distribution of
examinees' answer vectors and hence is broadly applicable. Especially
important in this
copy-detection setting, the RP test is shown to be exact in that its size
is guaranteed to
be no larger than a nominal alpha value. Additionally, simulation results
suggest that the
RP test is typically more powerful for copy detection than existing
approximate tests,
including the commonly used omega index test. The development of the RP
test is
based on the idea that the copy-detection problem can be re-cast as a
causal inference
and missing data problem. In particular, the observed data are viewed as a
subset of a
larger collection of potential values, or counterfactuals, and the null
hypothesis of ``no
copying" is viewed as a ``no causal effect" hypothesis and formally
expressed in terms
of constraints on potential variables.

Tutti gli interessati sono invitati a partecipare.

Per informazioni: manuela.cazzaro a unimib.it.
-------------- parte successiva --------------
Un allegato HTML è stato rimosso...
URL: <http://www.stat.unipg.it/pipermail/sis/attachments/20180308/567c9f40/attachment.html>