 Find coupons, reviews and similar sites for any retailer  What
is a Correlation? How is the Strength of a Correlation
Determined?  What is a correlation? How is the strength of
correlation determined?  Correlation is a term used to describe
the relationship of two variables, where one has an effect on
the other. A negative correlation describes the relationship
between the two variables, where one variable will increase, and
the other deceases. Similarly, a positive correlation is where
one variable affects the other, but both will move in a positive
direction.  A linear correlation describes how variables plotted
on a scatter diagram follow a pattern that is a straight line,
and a curvilinear correlation shows a pattern too, although it
is not linear. A curvilinear correlation is a pattern of
curvature, as the word suggests.  It is important to identify
correlations, positive or negative, so we can see how much, or
possibly why one variable influences the other. Sometimes there
will be no correlation whatso