In this case, looking at simply the standard deviations is actually a
little misleading. I've posted the actual distributions to the page,
which provides a different picture than the standard deviations would
suggest. There is a definite skew in the distribution of the data,
especially for anonymous users. Anonymous users are much more likely to
give 5s while ratings from registered users appear to be more distributed.
On Thu, 30 Sep 2010, Magnus Manske wrote:
Just out of interest, if the maximum value is 5,
and (for example) the
"neutral" mean is 3.6, how can the standard deviation be 1.82?
Wouldn't that allow values up to 5.42?
If that's an effect of extreme skewing, maybe the median would be
better suited to give a "common" value?
A data set [ 5, 5, 4, 3, 1 ] will have mean 3.6 and standard deviation
1.67. This is also above 5. There is skewness here. If you use the
median (here 4) you wont get any decimals. I think the mean is fine.
cheers
Finn
___________________________________________________________________
Finn Aarup Nielsen, DTU Informatics, Denmark
Lundbeck Foundation Center for Integrated Molecular Brain Imaging
http://www.imm.dtu.dk/~fn/ http://nru.dk/staff/fnielsen/
___________________________________________________________________
Cheers,
Magnus
On Thu, Sep 30, 2010 at 12:50 AM, Howie Fung <hfung(a)wikimedia.org>
wrote:
Everyone,
As some of you may know, we launched an experimental Article Feedback
feature as part of the Public Policy Initiative last week. The
"Article
Feedback Tool" enables readers to quickly assessthe sourcing,
completeness,
neutrality, and readability of a Wikipedia article on a five-point
scale.
It is currently deployed on about 300 articles [1] in the area of
Public
Policy on the English Wikipedia. More details may be found on the
blog post
[2] as well as the post on Foundation-l [3].
We've been capturing the ratings data and have some early analysis
to share
around the types of ratings users are providing. There are some
interesting
differences between anonymous and registered users:
http://www.mediawiki.org/wiki/Article_feedback/Public_Policy_Pilot/Early_Da…
The dump of the article-level data is also available [4] for those
who are
interested.
If anyone would like to be involved in the ongoing research and
evaluation
of this tool, please sign up on the Article Feedback Workgroup page.
[5]
Howie
[1]
http://en.wikipedia.org/wiki/Category:Article_Feedback_Pilot
[2]
http://blog.wikimedia.org/blog/2010/09/22/article-feedback-pilot-goes-live/
[3]
http://lists.wikimedia.org/pipermail/foundation-l/2010-September/061056.html
[4]
https://spreadsheets.google.com/ccc?key=0Aikdcg5HdSKbdFRhdUN1Rm1iZzB5dUdMUl…
[5]
http://www.mediawiki.org/wiki/Article_feedback/Public_Policy_Pilot/Workgroup
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