Add series to a group.
Syntax
group_name.add arg1 [arg2 arg3 ...]
List the names of series or a group of series to add to the group.
Examples
dummy.add d11 d12
Adds the two series D11 and D12 to the group DUMMY.
Cross-references
See
“Groups” for additional discussion of groups.
“Cross-section Identifiers” discusses pool identifiers.