How is the Ranking Computed?

How is the ranking computed? Earlier today I thought that I was ranked 150 of 200. Now I am 50 of 200. I am not complaining because I thought that 150 was over ranking for the work that I have completed so far. Just trying to figure out how this is computed.

By the way, you need to have a "perplexed" emoticon for those of us who are just questioning.

Leigh Writer
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