dairyspain: Data on Spanish dairy farms
In sfaR: Stochastic Frontier Analysis Routines

dairyspain

R Documentation

Data on Spanish dairy farms

Description

This dataset contains six years of observations on 247 dairy farms in northern Spain, drawn from 1993-1998. The original data consist in the farm and year identifications, plus measurements on one output (i.e. milk), and four inputs (i.e. cows, land, labor and feed).

Format

A data frame with 1,482 observations on the following 29 variables.

FARM: Farm identification.
AGEF: Age of the farmer.
YEAR: Year identification.
COWS: Number of milking cows.
LAND: Agricultural area.
MILK: Milk production.
LABOR: Labor.
FEED: Feed.
YIT: Log of MILK.
X1: Log of COWS.
X2: Log of LAND.
X3: Log of LABOR.
X4: Log of FEED.
X11: 1/2 * X1^2.
X22: 1/2 * X2^2.
X33: 1/2 * X3^2.
X44: 1/2 * X4^2.
X12: X1 * X2.
X13: X1 * X3.
X14: X1 * X4.
X23: X2 * X3.
X24: X2 * X4.
X34: X3 * X4.
YEAR93: Dummy for YEAR = 1993.
YEAR94: Dummy for YEAR = 1994.
YEAR95: Dummy for YEAR = 1995.
YEAR96: Dummy for YEAR = 1996.
YEAR97: Dummy for YEAR = 1997.
YEAR98: Dummy for YEAR = 1998.

Details

This dataset has been used in Alvarez et al. (2004). The data have been normalized so that the logs of the inputs sum to zero over the 1,482 observations.

Source

https://pages.stern.nyu.edu/~wgreene/Text/Edition7/tablelist8new.htm

References

Alvarez, A., C. Arias, and W. Greene. 2004. Accounting for unobservables in production models: management and inefficiency. Econometric Society, 341:1–20.