2011 Experimentation Statistics Uncertainty 
Occam's Razor
APRIL 8, 2013
Remember that the raw number is not the only important part, we would also measure statistical significance. By 2011, the company had 20 full-time photographers on staff. They might deal with uncertainty, but they're not random. The properties with professional photography had 2-3 times the number of bookings!
The Unofficial Google Data Science Blog
MAY 31, 2016
A geo experiment is an experiment where the experimental units are defined by geographic regions. Statistical power is traditionally given in terms of a probability function, but often a more intuitive way of describing power is by stating the expected precision of our estimates. They are non-overlapping geo-targetable regions.
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