BMC Health Services Research

Table 2 Panel-data unit root test (Fisher type based on Augmented Dickey-Fuller)

From: Physician induced demand for knee replacement surgery in Iran

Variables	Inverse chi-squared P	Inverse normal Z
n_it − 1	665.66^**	-22.50^**
s_it − 1	520.99^**	-19.22^**
f_it − 1	395.89^**	-15.85^**
n_it	645.13^**	-22.20^**
*inc*	124.21^**	-9.47^**

^**Indicate that the non-stationary null hypothesis is rejected at the 1% significance level

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ISSN: 1472-6963

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