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")