In statistics, a confounding variable (also confounding factor, lurking variable, a confound, or confounder) is an extraneous variable in a statistical model that correlates (positively or negatively) with both the dependent variable and the independent variable.
variable, namely the season: An increase in average temperature causes both an increase in ice cream consumption/purchases/sales (observed event 1) and an increase in the number of people swimming;
http://en.wikipedia.org/wiki/Confounding
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