A panel data set in long form. See embedded sgpData_LONG data set for an exemplar.
state
A two letter acronymn indicating the state associated with the data. If not supplied, the function will try to infer what the state is from the data object name supplied.
var.names
A list or a dataframe that includes all required columns that do not match the SGP conventions, as well as all secondary columns needed
for summarization and reporting.
fix.duplicates
Argument for future functionality intended to deal with duplicate cases in supplied long data.
Value
Function returns an object of class SGP. The long data is
in the data slot.