hours or up to a month if there are significant cyclic variations (e.g., page views
for entertainment topics increase on Thursdays and Fridays).
Conducting such live market tests is even more valuable when the confounds
are unrelated to user experience, as described next.
8.12.3Confounds Unrelated to User Experience
Our measurements of the success of a new Web site or application are also
affected by many confounds unrelated to user experience:
✦Seasonality. Bricks-and-mortar businesses have long considered seasonality in
their strategic planning. Obvious seasonality confounds, especially for
consumer e-commerce, are the peaks that occur before Christmas, ...
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