## Data provided with Tim Coelli's Frontier 4.1

*data from [Coelli et al. (1996)](http://www.uq.edu.au/economics/cepa/frontier.php)*

This dataset contains the following variables:

- firm ID: `firm`
- output quantity (value added): `output`
- capital input quantity (quantity index): `capital`
- labour input quantity (quantity index): `labour`

References:

[1] Coelli, T. (1996) A Guide to FRONTIER Version 4.1: A Computer Program for Stochastic Frontier Production and Cost Function Estimation, CEPA Working Paper 96/08, 
University of New England.