Hi Doug,
in my eyes the best way to get the desired functonality is to use
spreadsheets. Years ago I had been using decreased point values, see
res/fhwf/riegler/Misc/Spreadsheets/
for the triple of spreadsheets I have used for this. If you want to try
them it is a good idea to consult the Spreadsheet Help for the
spreadsheet hierarchy of these three sheets.
Working with spreadsheets looks weird an complicated at first glance.
But as always in loncapa, it is quite powerful and rational once you got
the idea.
Frankly, I believe using spreadsheets is the only reasonable way to get
the desired functionality. Problems should not be mixed up with grading
rules. Mixing these up results in problems which fit a single instructor
but are unlikely to be usable by others which defeats the whole idea of
loncapa.
Peter
On 03.02.2015 19:54, Mills, Douglas G wrote:
Hi All,
I'm guessing there's probably a better way of doing this and someone on
this list has probably done it. Some of the instructors I work with
would like to give, say, 5 attempts on a homework or quiz question but
with decreased point value for each subsequent attempt, along the lines
of 1point if you get it right the first try, .8 points if correct on
the second try, .6 points on the third try, etc.
Early one I tried the weight parameter with a variable for the value of
it that changed with the number of tries. That worked beautifully… in
the problem itself, but in the context of the assessment progress chart
and other places in Lon-Capa, the variable was not evaluated so the
weight turned out to be 0.
Using "assigned_score" works well for this, but _as I understand it_
requires use of the custom problem type. I've done a lot of these and
appreciate their power and versatility, but they have their downsides,
perhaps for me the most significant being the need to write code to
evaluate significant figures and tolerance, which are done so well for
me in numerical response problems.
The approach used by some of the instructors I work with who do their
own coding is to give the students access to the same quiz 3 times and
then using the timestamps to determine which was the first attempt, the
second attempt and the third attempt and plug those into excel to
generate the best score with the second attempt worth .8 of the full
points possible and the third attempt worth .6. They have to look at
timestamps because of course the clever and slightly unscrupulous
students in the courses do these in reverse order to use the lower-value
quizzes to practice for the full-value quiz. I proposed using sequences
to prevent access to the lower value quizzes until each of the
subsequent quizzes has been attempted, but that has not caught on.
So, is there a way, within one quiz, to allow multiple attempts at each
question and automatically decrease the point value of that question for
each attempt besides using "assign_score" (or is there a way to get
tolerance and sig fig functionality into a customresponse without coding
it yourself?)
Or some other way to approach this that I'm missing?
Thanks as always!
Doug
Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmi...@illinois.edu <mailto:dmi...@illinois.edu>
(217) 244-5739
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Peter Riegler
Ostfalia Hochschule für angewandte Wissenschaften
Hochschule Braunschweig/Wolfenbüttel
Salzdahlumer Str. 46/48
38302 Wolfenbüttel
Fakultät Informatik
Fon: ++49 5331 939 31540
http://ostfalia.de/pws/riegler
Zentrum für erfolgreiches Lehren und Lernen
Fon: ++49 5331 939 17200
http://www.ostfalia.de/zell
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