[maemo-community] maemo.org Products karma

[From: Alexey Zakhlestin]

On Tue, Aug 18, 2009 at 2:12 AM, Andrew Flegg<andrew at bleb.org> wrote:
> On Mon, Aug 17, 2009 at 23:02, Alexey Zakhlestin<indeyets at gmail.com> wrote:
>>
>> 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.
>>
>> 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
>
> This'd be the only element in our current karma system which decays
> over time, then (IIRC)? Now, I'm all in favour of karma (as a whole)
> decaying, but I'm not sure about doing that on an individual element.
>
> Is this solely to be used for the authors' karma rating, or is it also
> going to be used for identifying "Hot" downloads on maemo.org? And the
> aim is to track the "vitality" of an application?

Idea is to react on changes of activity around applications. So, when
a new application appears and is constantly becoming more popular it
will be on top (because of positive dynamics), and when some app loses
it's active userbase it will lose karma pretty fast.

So:
1) Absolute digits shouldn't matter
2) There should be slow declining by default
3) Declining should slow down, while approaching 0

My formula doesn't do #3, because it is linear

>> there is a large group of apps, which have highest "karma"
>
> Indeed. It seems very very bunched up at the top there. Perhaps some
> kind of non-linear function needs to be introduced to space things out
> a little?
>
> Certainly a very good starting point, and the Flash demo gives an easy
> way of visualising.
>
> Cheers,
>
> Andrew
>
> --
> Andrew Flegg -- mailto:andrew at bleb.org  |  http://www.bleb.org/
> Maemo Community Council chair
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>



-- 
Alexey Zakhlestin
http://www.milkfarmsoft.com/
Sent from St Petersburg, Russian Federation