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(Delta is easy to calculate from the y = f(x) = ax + b form of both regression lines, as a = tan(alpha) where alpha is the angle of the function w.r.t. the x axis)
Personal pitfalls: forgetting to get the square root, forgetting to consider the sign (+ or -) of the result.
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Day 6: Correlation and Regression Lines #1
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I found Wikipedia's "geometric interpretation" to be helpful here, i.e.
r² = 1/cos(delta) - tan(delta)wheredeltais the angle between the given regression lines. https://en.wikipedia.org/wiki/Pearson_product-moment_correlation_coefficient#Geometric_interpretation(Delta is easy to calculate from the
y = f(x) = ax + bform of both regression lines, asa = tan(alpha)where alpha is the angle of the function w.r.t. the x axis)Personal pitfalls: forgetting to get the square root, forgetting to consider the sign (+ or -) of the result.