Table 3. Visitation rate model results (equation 2).

		NB model				ZTNB model
Variables	Coefficients	Std. error	z	p	Coefficients	Std. error	z	p
campsites	0.0078	0.0028	2.75	0.006	0.0078	0.0028	2.75	0.006
ln(acres)	0.2232	0.0717	3.11	0.002	0.2232	0.0717	3.11	0.002
activities (#)	0.1332	0.0450	2.96	0.003	0.1332	0.0450	2.96	0.003
PWC access (dummy)	−1.6565	0.3036	−5.46	0.000	−1.6565	0.3036	−5.46	0.000
ln(PA)	−0.4482	0.1420	−3.16	0.002	−0.4482	0.1420	−3.16	0.002
ln(travel time)	−0.9147	0.3174	−2.88	0.004	−0.9147	0.3174	−2.88	0.004
cons	16.7207	2.6793	6.24	0.000	16.7208	2.6794	6.24	0.000
Dependent variable = mean annual park visitation
n =	57				57
LR chi2	75.28				75.08
prob>chi2	0.000				0.000