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Table 1 Input and output variables used in the model of production

From: An application of data envelopment analysis on marble factories

Model variables

Inputs

Number of factory workers

Number of engineers employed at the factory

Number of machines in the factory

Number of marble quarries belonging to the factory

Ratio of produced products sold on the internal market (%)

Ratio of produced products sold on the external market (%)

Monthly costs of laborer employed in the factory

Monthly electricity costs of the factory

Monthly water costs of the factory

Monthly maintenance costs of the factory

Monthly fuel costs of the factory

Average monthly socket costs of the factory

Outputs

Monthly produced processed marble amount (m2)

Number of produced product varieties