[maemo-community] App with highest app-karma on frontpage

[From: Alexey Zakhlestin]

On 11.11.2009, at 19:28, Aniello Del Sorbo wrote:

> 2009/11/11 Alexey Zakhlestin <indeyets at gmail.com>:
>>
>> On 11.11.2009, at 18:27, Dave Neary wrote:
>>
>>> Hi,
>>>
>>> Alexey Zakhlestin wrote:
>>>> http://maemo.org/downloads/score/OS2008/25/
>>>> http://maemo.org/downloads/score/Maemo5/25/
>>>
>>> Looks good! Out of interest, where is app karma documented? I saw  
>>> your
>>> simulations of what the formula looked like, and just re-read the  
>>> app
>>> karma thread from August, but I'm afraid I didn't figure out what
>>> formula we're using now for app karma.
>>
>> main formula:
>>
>> $rating = ($yesterday * 0.999)
>>             + 0.1 * ($avg_d_this_week - $avg_d_last_week)
>>             + 0.1 * ($avg_c_this_week - $avg_c_last_week)
>>             + 0.1 * ($avg_v_this_week - $avg_v_last_week);
>>
>> d = downloads
>> c = comments
>> v = votes
>>
>> additionally, we use "fake" formula for apps which do not have enough
>> stats (appeared less than 14 days ago):
>>
>> "100" on the first day
>> and then each day "$yesterday + 0.001" if stats are better then
>> yesterday and "$yesterday - 0.001" if stats are worse.
>>
>> this way, new apps will stay close to the base score with minimal
>> fluctuations.
>> after they have enough stats they will be recalculated using proper
>> formula
>>
>
> Will the app-karma be retained when a new version of an already
> present App comes along in Extras?

yes. as long as application is updated app-karma history persists
karma-history is independent for apps for various platforms of course.  
release for the new platform is not considered as "update"