Khan/khan-exercises — Issue #14668: Parabola intuition 3 - Over Aggressive Negative Scoring
Author: KhanBugz
Created: 2012-02-25 21:18:51+00:00
State: open
Labels: chrome, other, xp

Your scoring algorithm is too penalty heavy. One wrong, it generates six problems. I got the seventh one wrong, now it sets me back farther than when I started.

It is as if I have time warped back into high school, where all that was noticed was wrong. I wouldn't complain, but a half hour later and it is like I did nothing at all.

It makes me (and I am sure I am speaking for other) not want to participate in the exercises portion of the site simply because it is impractically time consuming. Do not take this as a whiny student. Take it as a real observation. I spend hours on this site (little light the last week cos other classes started) and I am just telling you what is obvious.

The benefit of repetition is lost the second the student starts to hate the modules. One wrong shouldn't generate a fifteen-thirty minute penalty period. Sadly, I made the first mistake simply because this was my first math stop for the day and was warming up.

I think it could be tweaked if you ran a regression on four data sets (assuming you are just using a simple logistic regression of right/wrong). I am just an AI student so I do not have all the answers but maybe it could be trained on a secondary set that considers successive right and wrong as well as total right and wrong. Personally, this algorithm feels like it doesn't consider right at all and just looks at wrong and beats the student to a pulp.

It is frustrating. My personal gripe is that I have to finish your linear algebra set and as that is a very involved video set and subject this time consumption is absolutely causing me indigestion and general chaos.

[parabola_intuition_3.html?seed=98&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=98&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=98&problem=0&debug&activity=%5B%5D)

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