Table 2.

Estimation of Wage Function

Explanatory variable	Male		Female		Part-time worker**
	Estimated Value	Probability	Estimated Value	Probability	Estimated Value	Probability	Estimated Value	Probability
Age	0.106	0.000	0.0480	0.000	0.001	0.756	0.0003	0.687
Age2	-1.08 × 10-3	0.000	-5.55 × 10-4	0.000	-1.70 × 10-5	0.804
Constant term	3.42	0.000	4.41	0.000	6.743	0.000	6.77	0.000
No. of Samples*	12		12		12		12
F static	169		37.6		0.110		0.170
Probability	= < 0.000		= < 0.000		0.896		0.687
Coefficient of determination	0.976		0.893		0.024		0.016
${\overline{R}}^2$	0.971		0.869		-0.193		-0.081

Note that Table 2 is cited in the additional file 1(Technical Annex).

For regular employee, explained variable is log (prescribed monthly salary/1,000)

For part-time worker, explained variable is log (prescribed per-hour wage)

*The value 12 quotes the 12 age classification used in census of earnings.

** 2 estimated values of Part-time worker mean that part time worker's wage is not expressed by the function of age respectively