How to compare to previous period
Simply click the date selector at the top right of a dashboard, choose your desired comparison period from the dropdown, then click "Apply".
Comparisons depend on the availability of historical data: If no data is available from the previous period or year, the comparison metric will display 0%.
Previous Period: This compares to the same number of days prior to your current selection. If you choose "Last 7 days", you will see a comparison to the 7 days prior to the current 7 day period. If you choose "This month", you'll see a comparison to last month. If you choose a custom date range that spans 47 days, then the comparison will be to the previous 47 day period.
Previous Year: This is based on the calendar year. If you choose "Last 7 days", then your comparison will be to the exact same calendar dates of the previous calendar year. If you choose "This month", you'll see a comparison to the same month for the previous calendar year. And so on.
Note: The "Compare to Previous" comparisons are generally displayed as either a percentage increase/decrease or an up/down number. The specific metrics used to calculate these numbers will vary based on the module and the metric.
Working with Line Charts
When using "Compare to Previous", your line charts will display a secondary "previous period" line on them. Here's how it looks: