Table 2.

Summary of the observed variables in the Californian dataset

	Type	Min	Max	Median	Observations
Outcome	Categorical	1	2	1	217
Supervision/review of work	Categorical	1	2	1	130
Ability to hire employees	Categorical	1	3	2	91
Exclusivity of services	Categorical	1	3	3	110
Ownership of tools	Continuous	1	5	3	175
Is the worker required to wear a uniform?	Continuous	1	2	1	84
Who sets the work hours	Continuous	1	4	1	157
Delegation of tasks	Continuous	1	2	1	188
Chance of profit	Continuous	1	5	3	185
Risk of loss	Continuous	1	3	2	123
Where the work is performed	Continuous	1	2	1	166
Length of service	Categorical	0	25	1	76