Best Selling Days

Hi Anonymous ,

I created a sample pbix file(see the attachment), please check if that is what you want. 

1. Create a measure as below 

Flag = 
VAR _seldate =
    SELECTEDVALUE ( 'Calendar Table'[Date] )
VAR _tab =
    SUMMARIZE (
        ALLSELECTED ( 'Calendar Table' ),
        'Calendar Table'[Date],
        "@avgsale", [Averagesalessperday]
    )
VAR _tab2 =
    ADDCOLUMNS ( _tab, "@rank", RANKX ( _tab, [@avgsale],, DESC, DENSE ) )
VAR _rank =
    MAXX ( FILTER ( _tab2, [Date] = _seldate ), [@rank] )
RETURN
    IF ( _rank <= 5, 1, 0 )

2. Create a visual and apply the visual-level filter on the visual with the condition(Flag is 1)

If the above one can't help you, please provide some raw data in your table (exclude sensitive data) with Text format, your visual Fields settings and your expected result with backend logic and special examples? It would be helpful to find out the solution. You can refer the following links to share the required info:

How to provide sample data in the Power BI Forum

How to Get Your Question Answered Quickly

And It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards