Abstract：
:Adjusting for the operational environment in studies of performance measurement is very important, otherwise the analysis may lead to unrealistic scores, especially when its influence on costs is high, such as in the water utilities. In this paper, we study the influence of exogenous variables on the water utilities performance by applying conditional efficiency measures based on the order-m method and its probabilistic formulation. We use a sample of 66 water utilities operating between 2002 and 2008, representing about 70% of the Portuguese population. Our research suggests that inefficiency of Portuguese water utilities is substantial for some utilities: several exogenous variables might influence it considerably. For example, regulation has a positive influence on efficiency but when drinking water supply and wastewater services are provided by the same utility or when the wholesale and retail activities are provided together, the performance is lower. The effect of ownership is inconclusive and the variables residential customers, water source, peak factor, and density of customers have a mixed influence on performance which varies according to their scores.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Carvalho P,Marques RCdoi
10.1016/j.jenvman.2011.06.008subject
Has Abstractpub_date
2011-10-01 00:00:00pages
2698-707issue
10eissn
0301-4797issn
1095-8630pii
S0301-4797(11)00205-2journal_volume
92pub_type
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