Suppose Santander's data analyst decides to check for non-linearity, and includes a quadratic term (X2) into the model specification: Y₁ =B₁ + B₂X₁+ B3 X²? + Ui Does the marginal effect of X on Y change sign? Sketch a figure describing relationship between Y and X.

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Suppose Santander's data analyst decides to check for non-linearity, and includes a
quadratic term (X72) into the model specification:
Y₁ =B₁ + B₂X₁+ B3 X²? + U₁
Does the marginal effect of X on Y change sign? Sketch a figure describing relationship
between Y and X.
Transcribed Image Text:Suppose Santander's data analyst decides to check for non-linearity, and includes a quadratic term (X72) into the model specification: Y₁ =B₁ + B₂X₁+ B3 X²? + U₁ Does the marginal effect of X on Y change sign? Sketch a figure describing relationship between Y and X.
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