The popularity rating of ActiveDecorator explained

Github Repository Rubygem
The highest rated repository is rails/rails with 25413 watchers and 9985 forks, resulting in a Github score of 100.00 The highest rated Rubygem is rake with 68332263 total downloads
These are the references for the score, marking the popularity of 100%
Now, the repository for ActiveDecorator over at amatsuda/active_decorator has got 418 watchers and 48 forks, resulting in a Github score of 0.87 Now, the gem active_decorator has got 102415 total downloads
Therefore, the relative popularity percentage can be calculated for ActiveDecorator
0.87 watchers & forks * 100% = 0.87%
100.00 top score
102415 total downloads * 100% = 0.15%
68332263 top score
The average of those two values results in the score:


So, assuming everyone is using the most popular projects,
roughly one out of 100 Rubyists use ActiveDecorator

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