The panel data have a set of time series for each entity (e.g. country) arranged such that all time series data for one entity is together. The data for the second entity should be below the entire data for first entity. When a variable is lagged twice, special care is needed to insert NA's for the first two time points (e.g. weeks) for each entity (country).
Location of the column having time identities (e.g. the week number)
Data on variable to be lagged linked to ID
Vector containing 2 lagged values of xj.
This function is provided for convenient user modifications.
Prof. H. D. Vinod, Economics Dept., Fordham University, NY
A more general function
PanelLag has examples.
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