.diff_panel: Panel-aware differencing
Description
Computes k-th differences within each cross-sectional unit.
Usage
.diff_panel(panel, vars, k = 1L)
Value
A data.frame (or vector if single var) of differenced values.
Arguments
- panel
A panel data.frame from .make_panel().
- vars
Character vector of column names to difference.
- k
Integer difference order (default 1).