reorder |
@first | Order the group members based upon their first value (ignoring NAs). |
@firstna | Order the group members based upon their first value (treating NAs as a value). |
@last | Order the group members based upon their last value (ignoring NAs). |
@lastna | Order the group members based upon their last value (treating NAs as a value). |
@max | Order the group members based upon their maximum value. |
@mean | Order the group members based upon their mean. |
@median | Order the group members based upon their median value. |
@min | Order the group members based upon their minimum value. |
@obs | Order the group members based upon the number of non-NA observations. |
@rand | Randomize the ordering. |
@reverse | Reverse the current ordering. |
r | Reverse the sort order. |