The popularity rating of Rakismet explained

Github Repository Rubygem
The highest rated repository is rails/rails with 29612 watchers and 12022 forks, resulting in a Github score of 100.00 The highest rated Rubygem is rake with 93009895 total downloads
These are the references for the score, marking the popularity of 100%
Now, the repository for Rakismet over at joshfrench/rakismet has got 322 watchers and 40 forks, resulting in a Github score of 0.58 Now, the gem rakismet has got 180268 total downloads
Therefore, the relative popularity percentage can be calculated for Rakismet
0.58 watchers & forks * 100% = 0.58%
100.00 top score
180268 total downloads * 100% = 0.19%
93009895 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 Rakismet

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