Tableau CPC calculation

Question

I have a problem with calculating CPC in Tableau. I have the cost and the number of the click but Tableau is not calculating the right CPC. the formula I used : [Cost]/[Click] I attached two tables in this request. first shows the table in which I calculated all KPIs in Zeppelin. the second the calculation in Tableau.

The whole data set has many null and 0 values, but it is the same data set used in zeppelin

The result of CPC is not correct in Tableau.

Answer 1

• The problem seems to be that Tableau is using aggregate functions when you add measures, and in this case of CPC calculation, it's not correct.

• Tableau is doing [cost]/[click] division (on row-level) and then simply averages all those numbers (you are basically calculating an average of an already average number).

• What you are after is a bit different and you have to fix the math to make sure all costs are aggregated first and then divided by sum of all clicks, so:

SUM([cost]) / SUM([clicks])

• This will give you the correct and mathematically sound numbers.

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