Two-stage DEA: caveat emptor

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Monitoring bank performance in the presence of risk (2014, unknown): “When the inefficiency score is the dependent variable (d 2 [0, ? ?)), we use a truncated regression (Greene 2003; Simar and Wilson 2011).”
Effect of FDI and Time on Catching Up: New Insights from a Conditional Nonparametric Frontier Analysis (2015, background): “Unfortunately, these approaches often are flawed by some restrictive and often unverifiable prior assumptions (see Simar and Wilson 2007, 2011).”
Unobserved heterogeneity and endogeneity in nonparametric frontier estimation (2016, background): “The “separability condition” described in Simar and Wilson (2007, 2011) is the assumption that Ψ(z) = Ψ for all z ∈ Z.”
Central limit theorems for conditional efficiency measures and tests of the ‘separability’ condition in non‐parametric, two‐stage models of production (2018, unknown): “…at the level (x, y).2 In this case, it is meaningful to analyse the behaviour of λ(x, y) as a function of Z by using an appropriate regression model; see Simar and Wilson (2007, 2011) for details.3 Alternatively, if the separability condition does not hold, then we have a more general…”
On the comparative performance of socially responsible and Islamic mutual funds (2014, background): “As summarized in Simar and Wilson (2011), this literature kept on expanding to include Banker and Natarajan (2008), Hoff (2007), McDonald (2009), or Ramalho et al. (2010), among others.”