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Algoroo tracks Google algorithm changes by observing turbulence in rankings of thousands of keywords.
When the bar is high, it's likely that Google has made a tweak to their algorithm.
A "Roo" is the average movement per keyword for the day, ie:
Total movement across all tracked keywords for the day / number of tracked keywords.
The working set we are using is ~17,000 keywords and ~100 positions deep, on a daily basis.