Use the Compare Table to define custom formulas with columns of data. View measures side by side, and perform math across the table’s columns and rows.
Available in Salesforce Classic and Lightning Experience. 
Available for an extra cost in Enterprise, Performance, and Unlimited Editions. Also available in Developer Edition. 

To view visualizations:  “Use Wave Analytics” 

Select Compare Table from the chart type gallery.

Add dimensions by clicking Group.
Note
Null values that occur in the data are displayed as minus signs ("").

Change the first measure by clicking the cells selection (”Count of Rows”). Add more measures by clicking the arrow in the measure column header and then selecting Add a column.
With the new column selected, click the
cells selection to change the measure. You can also apply a filter by clicking the header of a measure column to select it and then clicking
Filter.
Dimension columns are on the left and measure columns are on the right. The measure columns are identified in formulas as A, B, C, and so on, with A being the far left measure column.

Add a measure column to hold a custom formula, and then select Edit this column from the dropdown menu.
In the
Formula field, create formulas using operators from this table.
Note
Measure columns are identified by uppercase letters from left to right.

+  A+B, A+100  Addition, applied per row. 
  AB, A100  Subtraction, applied per row. 
/  A/B, A/100  Division, applied per row. 
*  A*B, A*100  Multiplication, applied per row. 
( )  (BA)/(A*100)  Parentheses for grouping operations. 
In the column editor, you can enter SAQL formulas, including math functions, or choose a windowing function to calculate the values in the column. You can also name the column and choose a number format. If any of the formulas contain division by zero, the result is displayed as a minus sign ("").

To use SAQL, enter it directly into the formula editor, then click Apply to see the result.
See the
Wave Analytics SAQL Reference for more information on writing SAQL.
Note
The
percentile_desc and
percentile_cont functions can’t be used in windowing functions entered in the formula editor.

To use a function, choose the formula editor and then choose one of the windowing functions from the menu. After you configure the function, click Apply to see the result.
Switch to the formula editor to see the SAQL generated by the chosen function. You can edit the SAQL in the formula editor after generating it with a function just as if you’d written it.