Here's an official answer:

http://www.google.com/support/forum/p/Android+Market/thread?tid=4c5752ca3e5af4ff&hl=en

On Tue, Dec 22, 2009 at 4:55 PM, dadical <keyes...@gmail.com> wrote:

> Same thing with my application, Screebl.  Dropped by around 10% in one
> night.  I've released lots of updates over the past few months,
> averaging about one/week, and have never seen this happen.  Perhaps
> Google has changed the definition of an active installation?
>
> Disturbing as active install count is the most heavily weighted factor
> in calculating ranking in the market.
>
> pawpaw17 wrote:
> > I released an upgrade to my app on Saturday night and since have
> > noticed an unusual number of uninstalls. My app has been out for 8
> > months, and this is very unusual. Has anyone else noticed this? I'm
> > wondering if there is anything related to the market, or a new OS
> > version hitting, or contracts with one of the phones coming up?
> >
> > Any thoughts would be very appreciated.
> >
> > Thanks!
> >
> > pawpaw17
>
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