[maemo-community] maemo.org Products karma

From: Alexey Zakhlestin indeyets at gmail.com
Date: Tue Aug 18 01:02:51 EEST 2009
I have first results regarding 9.06-07 sprint-task. We have 19 days of
stats-history, so, I was able to get 5 days of actual karma-digits.

Here is a demo: http://s3.amazonaws.com/statsdemo/index.htm
(requires flash)

Formula used is:

$karma = ($yesterday * 0.999)
        + 0.1*($avg_d_week - $avg_d_last_week)
        + 0.1*($avg_c_week - $avg_c_last_week)
        + 0.1*($avg_v_week - $avg_v_last_week);

d = downloads
c = comments
v = rating-votes

demo shows, that during these five days there is a linear declining of
"karma" for all apps, but speed differs.
there is a large group of apps, which have highest "karma"

I have a feeling, actually, that some floating-point calculations
result in precision-errors. I will try to do some tests using
arbitrary precision math-library.

So, my nearest plans are:
* deal with precision error
* make demos for other formulas

If there are any proposals on formulas I will be glad to
implement/test those. Probably something logarithmic?

Alexey Zakhlestin
Sent from St Petersburg, Russian Federation
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