Summarize based on field parameter

rajendraongole1 

It seems to work. I did go with another option instead though. 

The reason i needed to do the SUMMARIZE with a field parameter was that I wanted to calculate and average from all rows based on the value in it's selected parameter so to speak. So i went with this, which worked as well
In below I essentially want to know that when Product Group is my selected parameter, I want to calculate Quartile values for what ever connection a row has to a specific product group, Sub Group when that's seleced and if non of those then for total supplier. 

Total Lines Included = 
VAR _SelectedParam =
    SELECTEDVALUE ( 'Parameter'[Parameter Order] )
VAR _Table =
    ADDCOLUMNS (
        SUMMARIZE (
            FactOrders,
            DimItem[Articlecode],
            DimItem[Product group],
            DimItem[Sub category],
            FactOrders[poNumber],
            FactOrders[lineNumber],
            FactOrders[supplierName],
            FactOrders[actualLeadTime]
        ),
        "Q3",
            SWITCH (
                _SelectedParam,
                0,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.75 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName],
                            DimItem[Product group]
                        )
                    ),
                1,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.75 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName],
                            DimItem[Sub category]
                        )
                    ),
                2,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.75 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName]
                        )
                    )
            ),
        "Q1",
            SWITCH (
                _SelectedParam,
                0,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.25 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName],
                            DimItem[Product group]
                        )
                    ),
                1,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.25 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName],
                            DimItem[Sub category]
                        )
                    ),
                2,
                    CALCULATE (
                        PERCENTILE.EXC ( FactOrders[actualLeadTime], 0.25 ),
                        ALLEXCEPT (
                            FactOrders,
                            FactOrders[supplierName]
                        )
                    )
            )
    )
VAR _FilteredTable =
    FILTER (
        _Table,
        FactOrders[actualLeadTime] >= [Q1] - ( 1.5 * [Q3] - [Q1] )
            && FactOrders[actualLeadTime] <= [Q3] + ( 1.5 * [Q3] - [Q1] )
    )
VAR _Rows = COUNTROWS(_FilteredTable)

RETURN
   IF(ISBLANK(_Rows),0,_Rows)