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Week 3 (Scatter Plots (Covariance (Sample covariance of two variables ( x,…
Week 3
Scatter Plots
Covariance
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Sample covariance of two variables ( x, y) is given by this formula.
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Roughly speaking it is the average of products of paired deviations from the mean for the two variables of X and Y
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Correlation
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Contrary to the covariance, it is not affected by the scale of the variables
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