Through Metorik, we compare data against other periods to help you see the growth in metrics. By default, the previous dates will be the previous equivalent period.
So if you were looking at data from August 1 - August 31 and there were growth metrics there, it'd be using data from July 1 - July 31 to determine the amount of growth.
However, you can easily change the dates used for comparison when on a page that shows growth metrics. This gives you the chance to compare two sets of data, regardless of the dates.
If comparisons are possible, you'll see a calendar with a plus icon next to the date picker in the top right:
'Previous period' is the default, but you can also select 'previous year' to compare it to data from the same dates but in the previous year (eg. December 1 - December 31 2016 and December 1 - December 31 2015). Alternatively, you can use the date picker to select custom dates for comparison.
All growth metrics around the site will instantly be updated to reflect these dates, and some charts will even show the other date side-by-side, like so: