pseriesfy {plm} | R Documentation |
Turn all columns of a pdata.frame into class pseries.
Description
This function takes a pdata.frame and turns all of its columns into objects of class pseries.
Usage
pseriesfy(x, ...)
Arguments
x |
an object of class |
... |
further arguments (currently not used). |
Details
Background: Initially created pdata.frames have as columns the pure/basic class (e.g., numeric, factor, character). When extracting a column from such a pdata.frame, the extracted column is turned into a pseries.
At times, it can be convenient to apply data transformation operations on
such a pseriesfy
-ed pdata.frame, see Examples.
Value
A pdata.frame like the input pdata.frame but with all columns turned into pseries.
See Also
Examples
library("plm")
data("Grunfeld", package = "plm")
pGrun <- pdata.frame(Grunfeld[ , 1:4], drop.index = TRUE)
pGrun2 <- pseriesfy(pGrun) # pseriesfy-ed pdata.frame
# compare classes of columns
lapply(pGrun, class)
lapply(pGrun2, class)
# When using with()
with(pGrun, lag(value)) # dispatches to base R's lag()
with(pGrun2, lag(value)) # dispatches to plm's lag() respect. panel structure
# When lapply()-ing
lapply(pGrun, lag) # dispatches to base R's lag()
lapply(pGrun2, lag) # dispatches to plm's lag() respect. panel structure
# as.list(., keep.attributes = TRUE) on a non-pseriesfy-ed
# pdata.frame is similar and dispatches to plm's lag
lapply(as.list(pGrun, keep.attributes = TRUE), lag)
[Package plm version 2.6-4 Index]