I am trying to perform a simple weighted average calculation and for the life of me cannot figure out why it does not work. Here are my data:

Part Number | Ship Quantity | Ext Sell Price |
---|---|---|

ABC | 10 | 1000 |

ABC | 1 | 150 |

ABC | 8 | 850 |

ABC | 2 | 290 |

I want to sum the EXT sell price (2290) and divide by the sum of the ship quantity (21) so that Part Number ABC shows a weighted average price of 109.05 within a Tableau table. The equation I am using is SUM([EXT Sell Price])/SUM([Ship Quantity]). The dialog box for the calculation formula gives me a green check indicating that the calculation is valid but when I apply the equation, my calculated field name (average sell price) shows up red with the following message:

"The calculation 'SUM of average sell price' can't be applied to a user defined aggregate"

This makes no sense to me. I feel like I am making a simple, rookie mistake. Any thoughts?

Tom

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