| dairyspain {sfaR} | 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
http://pages.stern.nyu.edu/~wgreene/Econometrics/oldPanelDataSets.htm
References
Alvarez, A., C. Arias, and W. Greene. 2004. Accounting for unobservables in production models: management and inefficiency. Econometric Society, 341:1–20.
Examples
str(dairyspain)
summary(dairyspain)