[Catalog-sig] Rating feature

[P.J. Eby]

At 02:27 PM 11/15/2009 -0500, Terry Reedy wrote:
>Sridhar Ratnakumar wrote:
>
>>Yes. If PyPI is going to have release-specific ratings, I suggest 
>>that each PyPI page (distname-version) show two rating bars:
>>a) release rating (logged-in user editable)
>>b) overall rating (averaged from all release ratings)
>
>I would make the second an average over all past releases
>I would also suggest making it a so-called exponentially weighted 
>average. Assume that past ratings are frozen and the individual 
>votes tossed, the update when a new release arrives would be something like
>
>past = .8 * past + .2 * current # adjust weights to taste
>current = <undefined>
>
>This way, a blunder release, once corrected, would have limited 
>effect on the overall average and its effect would disappear with time.

You need to weight also for the number of ratings, not just the overall rating.


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