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DTSTART:20131027T030000
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UID:calendar.6694.field_data.0@diag.uniroma1.it
DTSTAMP:20211028T023752Z
CREATED:20130623T143148Z
DESCRIPTION:CondEff: A Toolbox for Conditional Efficiency Measurement Luiza
BadinDepartment of Applied MathematicsBucharest University of Economic St
udies\,& Gh. Mihoc - C. Iacob Institute of Mathematical Statisticsand Appl
ied Mathematics\, Bucharest\, Romania A simple method for the determinatio
n of scale economies in non-parametric models Giovanni CesaroniDipartiment
o Sviluppo Economie Territoriali\,Presidenza del Consiglio dei Ministri\,
Roma CondEff: A Toolbox for Conditional Efficiency Measurement By Luiza B
adin\, Cinzia Daraio and Leopold Simar AbstractMotto: “Science is what we
understand well enough to explain to a computer. Art is everything else we
do' Donald KnuthRecent theoretical developments and empirical application
s (e.g. Daraio and Simar\, 2005\, 2007\; Badin and Daraio\, 2011) have sho
wn the usefulness of conditional efficiency models for comparing the perfo
rmance of Decision Making Units (DMUs) taking into account different exter
nal environmental conditions. Indeed\, introducing heterogeneity in the co
mparison of performance is a relevant issue\, often neglected in the liter
ature or addressed by relying on strong parametric or semi-parametric assu
mptions\, many times unrealistic. Nonparametric conditional efficiency mod
els allow for a complete and general handling of heterogeneity and of the
impact of external-environmental factors on the performance of DMUs. Lates
t contributions in this area (Badin\, Daraio and Simar\, 2010\; 2012a\,b)
propose a general two-stage approach\, which does not rely on the separabi
lity condition (meaning that the input-output space is independent from th
e external environmental factors that can influence only the distance of D
MUs towards the efficient frontier and not the efficient frontier itself).
Nevertheless\, the computations require technical and programming skills
in order to correctly implement the algorithms and run the applications. U
p to now none of the existing software available has implemented condition
al efficiency scores. We fill this gap by proposing in this paper a toolbo
x which implements the most updated research on conditional efficiency ana
lysis. It is suitable for applied researchers in order to perform the comp
utations and obtain rigorous empirical evidence. Some illustrations are pr
ovided on simulated and real datasets. The comprehensive CondEff Toolbox w
ill be developed in Matlab and will be freely available.Keywords: FDH\, DE
A\, conditional efficiency\, robust measures\, bootstrap\, bias correction
\, nonparametric regression\, optimal bandwidth. A simple method for the
determination of scale economies in non-parametric modelsBy Giovanni Cesar
oni and Daniele GiovannolaAbstractWe propose a procedure for the determina
tion of scale economies (cost-based returns to scale analysis)\, which is
based on the minimization of the ray average cost and allows a more straig
htforward approach when compared to existing methods. In particular\, for
the frontier points under evaluation\, we can avoid both the need to solve
the NIRS problem\, required in Fare and Grosskopf (1985)\, and that of so
lving the dual problem set by Sueyoshi (1999) to compute the intercept of
the supporting hyperplane and the corresponding value of the cost-based sc
ale elasticity. Therefore\, our procedure allows to dispose of the indeter
minacy implied by the multiplicity of solutions in the intercept method. M
oreover\, we conjecture that multiple solutions to the CRS cost program (i
.e. multiple optimal scale sizes) are not a problem\, because a result ana
logous to corollary 2 in Banker and Thrall (1992) holds. Another advantage
of our approach is that of dispensing from assumptions regarding the diff
erentiability of the transformation function and of the cost function. The
theoretical properties of the proposed methodology are derived under the
only assumption of strong disposability\, so that - contrary to Sueyoshi’s
method - it applies to FDH models. Key words: Returns to scale\, Scale e
fficiency\, DEA\, FDH
DTSTART;TZID=Europe/Paris:20130704T120000
DTEND;TZID=Europe/Paris:20130704T120000
LAST-MODIFIED:20130703T102632Z
LOCATION:Aula Magna
SUMMARY:MORE@DIAG Seminar\, Thursday 4 July 2013\, Aula Magna at 12:00 a.m.
- Luiza Badin and Giovanni Cesaroni
URL;TYPE=URI:http://diag.uniroma1.it/node/6694
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