How to do it...

To complete this recipe, do the following:

1. Create the following measure:

Covariance = 
    VAR __Table = 'R04_Table'
    VAR __Count = COUNTROWS(__Table)
    VAR __AvgA = AVERAGEX(__Table,[A])
    VAR __AvgB = AVERAGEX(__Table,[B])
    VAR __Table1 = 
        ADDCOLUMNS(
            __Table,
            "__Covariance",
            DIVIDE(
                ([A] - __AvgA) * ([B]) - __AvgB),
                __Count
            )
        )
RETURN
    SUMX(__Table1,[__Covariance])

2. On a Report page, create a Table visualization and place the t column from the R03_Table table as well as the RK4 measure into the Fields area of the visualization.

3. On the same Report page, create a Line chart visualization and place the t column from the R03_Table table into the Axis area and the RK4 measure into the Values area of the visualization.