Android Market Statistic
Sometimes statistics Android Market makes me wonder. When app have total installs ~10000-12000 it have only 45-55% active installs. What a ratio of quantities? In most cases, the application has good reviews (4.5 stars). Why active installs are only ~50%?
Look for example one of my app statistics:

Total: 12777
Active: 6158 (48%) 

What you can say about this problem?
What statistics you have, what ratio between Total and Active installs you have?
Android Market Statistic
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Sometimes statistics Android Market makes me wonder. When app have total installs ~10000-12000 it have only 45-55% active installs. What a ratio of quantities? In most cases, the application has good reviews (4.5 stars). Why active installs are only ~50%?
Look for example one of my app statistics:

Total: 12777
Active: 6158 (48%) 

What you can say about this problem?
What statistics you have, what ratio between Total and Active installs you have?