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. Author manuscript; available in PMC: 2010 Apr 1.
Published in final edited form as: Soc Sci Med. 2009 Mar 11;68(8):1439–1447. doi: 10.1016/j.socscimed.2009.02.003

Figure 1.

Figure 1

Figure 1

Nonlinear regression models (thick black lines) of the effect of cigarette price per pack (dollars) on current smoking (A), and ln(cigarettes/day) (B) from Equations S1a–S1b overlaid on the results of nonparametric models (thin black lines) with pointwise 95% confidence intervals (thin grey lines) from Equations 1a–1b. A piecewise linear specification reflects the initial decreasing effect of price, followed by a change in effect evident in both models. Equation 2a estimated that the change in effect of price on current smoker status was at $3.28 (SE 0.08) and Equation 2b estimated that saturation for the effect of price on ln(cigarettes/day) was at $3.17 (SE 0.42).