Technical and Scale Efficiency in Spanish Urban Transport: Estimating with Data Envelopment Analysis

Table 1

Taxonomy of frontier methodologies [12].

Functional form	Measurement error
	Deterministic	Stochastic
Parametric	Corrected OLS, and so forth	Frontiers with explicit assumptions (exponential, half-normal, etc.) for the TE distributions
Nonparametric	FDH, DEA-type models, and so forth	Resampling: chance constrained programming, and so forth