| plm.data {plm} | R Documentation |
This function transforms a data frame in a format suitable for using
with the estimation functions of plm.
x <- plm.data(x, index = NULL)
x |
a data.frame, |
index |
a vector (of length one or two) indicating the (individual and time) indexes. |
indexes can be :
A data.frame.
Yves Croissant
# There are 595 individuals
data("Wages", package="Ecdat")
Wages <- plm.data(Wages, 595)
# Gasoline contains two variables which are individual and time indexes
# The pdata.frame is called gas
data("Gasoline", package="Ecdat")
Gasoline <- plm.data(Gasoline, c("country","year"))
summary(Gasoline)
# Hedonic is an unbalanced panel, townid is the individual index
data("Hedonic", package="Ecdat")
Hedonic <- plm.data(Hedonic, "townid")