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Emerging Infectious Diseases Journal
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Volume 8: No. 1, January 2011

LETTER
Regression Model Fitting With Quadratic Term Leads to Different Conclusion in Economic Analysis of Washington State Smoking Ban [Response to Letter]

Quarter/Year Sales in Millions, $ Segmented Quadratic
1/02 96.2 95.9 101.0
2/02 98.9 95.7 98.7
3/02 99.5 95.4 96.7
4/02 95.3 95.2 95.0
1/03 90.5 95.0 93.5
2/03 92.1 94.7 92.4
3/03 93.1 94.5 91.5
4/03 92.9 94.3 90.9
1/04 89.4 94.0 90.6
2/04 92.1 93.8 90.6
3/04 96.9 93.5 90.9
4/04 93.7 93.3 91.4
1/05 91.0 93.1 92.2
2/05 97.0 92.8 93.3
3/05 98.6 92.6 94.7
4/05 97.7 92.4 96.3
1/06 91.4 92.1 98.3
2/06 96.3 96.4 100.5
3/06 99.3 100.8 103.0
4/06 97.9 105.1 105.8
1/07 99.7 109.4 108.9
2/07 114.2 113.7 112.2
3/07 126.0 118.0 115.8
4/07 124.2 122.3 119.7

Figure. Segmented and quadratic regressions fit to taxable retail sales in bars and taverns in Washington State after the implementation of a smoke-free law, from the first quarter of 2002 (1/02) through the fourth quarter of 2007 (4/07). Values are adjusted for inflation to the Consumer Price Index (www.bls.gov/cpi/).

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The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.


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