Checks whether the series has more than one open age group.
dd_oag_multiple(data)The data to be harmonized
TRUE/FALSE
An open age group is identified as one where the AgeSpan == -1 and AgeStart != 0.
You can run getAnywhere(dd_oag_multiple) to view the definition of this function.
if (FALSE) {
dd_oag_multiple(oag_multiple_df)
}