Selecting the gear icon next to a metric lets you specify the metric type and the attribution model.
|Standard||These metrics are the same metrics used in standard Analytics reporting. If a formula consisted of a single standard metric, it displays identical data to its non-calculated-metric counterpart. Standard metrics are useful for creating calculated metrics specific to each individual line item. For example, [Orders] / [Visits] takes orders for that specific line item and divides it by the number of visits for that specific line item.|
|Total||Use the total for the reporting period in every line item. If a formula consisted of a single total metric, it displays the same total number on every line item. Total metrics are useful for creating calculated metrics that compare against site total data. For example, [Orders] / [Total Visits] shows the proportion of orders against ALL visits to your site, not just the visits to the specific line item.|
For a full list of non-default attribution models and lookback windows supported, see Attribution models and lookback windows.