pseriesfy {plm} | R Documentation |
This function takes a pdata.frame and turns all of its columns into objects of class pseries.
pseriesfy(x, ...)
x |
an object of class |
... |
further arguments (currently not used). |
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.
A pdata.frame like the input pdata.frame but with all columns turned into pseries.
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)