After estimating a probit model for the likelihood of a website visitor clicking through conditional on the average income from the county in which the visit's IP address came from, you get the following results: ClickThroughi = -1.8(0.75) + 0.06(0.005)Incomei, where standard errors are reported in parenthesis. What would be the calculation that yields the marginal effect of income moving from $40,000 to $41,000 on the click-through rate?
A. ?[0.06(41 - 40)]
B. ?(-1.8 + 0.06 × 41) - ?(-1.8 + 0.06 × 40)
C. 0.8
D. -1.8 + 0.06 = -1.74
Answer: B
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