# Calculating Attach Rate - when product B is on a transaction that also has product A

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Hi experts.

I have a set of sales data where each product has a row for the number of units sold on each Sales Order.

I want to calculate the Attach Rate - where Product Type B was sold in a transaction that also had Product Type A.

So in the example below there were 4 transactions where Product A was sold, and in 2 of them, Product B was also sold. So the Attach Rate would be 50%.

Is there a way to calculate this in a Beast Mode? I have tried a few things but think I might be going about it the wrong way.

## Answers

• Contributor
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There might be a way to do this with a fixed function beast mode, but I'm not sure how at the moment. I'll give it a shot and update if I can figure something out.

However, if I had to do this, I would probably do something in Magic ETL to unpivot the products so that I had one row per order and then a column for each product, so then I could compare the products per order across the row. Another route would be to concatenate the products that were purchased, but it's the same concept - getting all of the products purchased onto the same row. Then I would build a beast mode to look for sales for product A, and any rows that had sales for product A and product B.

• Contributor
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Sorry If I've taken this too literally - this solution may not work if you have a lot of different products that you're trying to find attach rates for. I did get it to somewhat work with a couple of fixed function beast modes, though it's not an ideal solution.

First, I made a beast mode that looked for orders that include product A: max(max(distinct case when `Product` = 'A' then 'Y' else 'N' end) fixed (by `ID`)). I used this to filter on 'Y'.

Then, I made an 'Attach Rate' metric: sum(count(distinct case when `Product` = 'B' then `ID` end) fixed (by `ID` filter allow `Product A filter`))/COUNT(DISTINCT case when `Product` = 'A' then `ID` end)

This method only worked, however, if I kept the order IDs in the card:

If I removed the IDs, it looked like this:

Maybe someone with better fixed calc skills can get this over the finish line for you.

• Member
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Thanks Sean. I had tried something similar to what you tried with a beast mode, but was not quite getting the results. I definitely need it to not have the ID in the card as I need to show the overall Attach Rate.

I'm think I'm going to have to go the ETL route.

Thank again for having a go.