Saturday, March 14, 2009

CORRELATION

Pi Day United States of America constant π and is usually observed today, on March 14 (3.14, get it?)

MATHMATICALLY SPEAKING:

\rho_{X,Y}={\mathrm{cov}(X,Y) \over \sigma_X \sigma_Y} ={E((X-\mu_X)(Y-\mu_Y)) \over \sigma_X\sigma_Y},

Correlation

Correlation is a statistical technique that can show whether and how strongly pairs of variables are related. For example, height and weight are related; taller people tend to be heavier than shorter people.

QUESTION: WHAT IS THE CORRELATION

container2 BETWEEN THESE TWO PICTURES:

GOLDBAR

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