Sorts a panel data set by unit id and then time period.
`data` is copied before sorting, so the object passed in is left
unmodified. For large panels where copying is undesirable, sort in
place instead with
`data.table::setorderv(data, c(idname, tname))`.
Usage
sort_panel(data, idname, tname)
Arguments
- data
data.frame (or data.table) used in function
- idname
unique id
- tname
time period name
Value
`data` sorted by `(idname, tname)`, with the same class
(`data.frame` or `data.table`) as `data`
Examples
id <- rep(sample(1:5), each = 2) # units in a shuffled, unsorted order
t <- rep(c(2, 1), 5) # each unit's own periods out of time order
dta <- data.frame(id = id, t = t, y = rnorm(10))
dta <- sort_panel(dta, idname = "id", tname = "t")
