To filter performance by period, you can follow the steps below: 

Management > Nursery > Analysis center > Nursery performance

After that, enter the period that you want to display the results. Click on "Group Results By" to select, choose a period of time, such as (week, month, quarter, semester or year) and proceed with filter button. 

After filtering, you will have a list of selected group. In this case, it is by week, as shown below: