Table 5.

Cost function estimates

Variable	AP financial data		Case studies
	Coefficient	Standard error	Coefficient	Standard error
Constant	8.053843*	0.909046	11.55254*	0.718119
Ln(price)	0.4827907*	0.0849852	0.1729654**	0.0627868
Coverage	2.01 × 10-5 *	4.52 × 10-6	0.000347**	0.000127
Vulnerable group	0.1143**	0.04873
Tamil Nadu			-0.2801**	0.12508
N	76§		16
F	22.48*		19.71*
Adjusted R2	0.4622		0.7891
Test for heteroscedasticity (χ2(1))	5.81**		3.29***
Additional tests

*significant at 99%; **significant at 95%; ***significant at 90%; ^§ Two cases are dropped as rent = 0