Skip Navigation Links
Centers for Disease Control and Prevention
 CDC Home Search Health Topics A-Z

Preventing Chronic Disease: Public Health Research, Practice and Policy

View Current Issue
Issue Archive
Archivo de números en español








Emerging Infectious Diseases Journal
MMWR


 Home 

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

Quarter/Year Sales in Millions, $ Linear Quadratic
1/02 96.5 89.2 101.0
2/02 98.7 90.0 98.8
3/02 99.7 90.8 96.7
4/02 95.1 91.6 95.0
1/03 91.1 92.4 93.6
2/03 91.9 93.3 92.5
3/03 93.3 94.1 91.6
4/03 92.6 94.9 91.0
1/04 90.0 95.7 90.7
2/04 92.2 96.5 90.7
3/04 97.1 97.3 90.9
4/04 93.4 98.2 91.5
1/05 91.5 99.0 92.3
2/05 96.6 99.8 93.4
3/05 99.3 100.6 94.8
4/05 96.9 101.4 96.4
1/06 91.8 102.2 98.4
2/06 96.3 103.1 100.6
3/06 99.4 103.9 103.1
4/06 97.6 104.7 105.9
1/07 100.3 105.5 108.9
2/07 114.1 106.3 112.3
3/07 126.0 107.1 115.9
4/07 124.2 108.0 119.8

Figure. Comparison of regression 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/). The figure displays 2 regression equations for the quadratic fitting (y = 0.1405x2 − 2.4969x + 103.58, R2 = 0.7811) and the linear fitting (y = 0.8166x + 88.359, R2 = 0.367) .

Return to article

 




 



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.


 Home 

Privacy Policy | Accessibility

CDC Home | Search | Health Topics A-Z

This page last reviewed October 25, 2011

Centers for Disease Control and Prevention
National Center for Chronic Disease Prevention and Health Promotion
 HHS logoUnited States Department of
Health and Human Services