. Author manuscript; available in PMC: 2013 May 2.

Published in final edited form as: Health Econ. 2011 Dec 12;22(1):89–105. doi: 10.1002/hec.1817

Table IV.

Comparison of price elasticity estimates across models

	Overall	FMM component 1	FMM component 2	FMM component 3	N	Test for difference between componentsp-value
Poisson	−0.297^** (0.129)				65,002
Negative binomial	−0.402^*** (0.152)				65,002
2-component, variable probability		−1.686^*** (0.652) [0.728]	0.013 (0.086) [0.272]		65,002	0.0123
2-component, constant probability		−0.951^*** (0.281) [0.735]	−0.070 (0.092) [0.265]		65,002	0.0030
3-component, constant probability		−1.124^*** (0.327) [0.651]	−0.097 (0.072) [0.327]	0.090 (0.226) [0.022]	65,002	0.0011^a 0.0033^b 0.4329^c

Standard errors in parentheses, sample proportion belonging to component in square brackets.

Test between components 1 and 2.

Test between components 1 and 3.

Test between components 2 and 3.

p<0.1

^**

p<0.05

^***

p<0.01.