Avg. Time between purchase orders

sarahi6 · 2022-08-11T18:33:28+00:00

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Hi,

Domo newbie here.

I am trying to find the average time between orders. The columns I have are

Customer ID
First Purchase date
Last Purchase date
Time between purchases

I tried to using the group by function to find the average time between orders, but it seems to be returning the same value as the 'time between purchases' column

Anyone have ideas of how to fix this in Magic ETL?

Thank you !

Comments

MichelleH

Hi @sarahi6 can you please share a screenshot of your group by function?

sarahi6

Sure @MichelleH ! Here is how I set up the group by function

mhouston

@sarahi6 because you have start and end date in your group on columns, you are only finding the average time between purchases on the same start and end date. I am assuming you want to find the average time between purchase by customer, so you will want to just group on customer id (remove the start/end date columns).

sarahi6

Yes @mhouston , I do want to find the average time between purchases. After changing the group by set up - I did notice that the value for the new 'avg. time between purchase' is returning the same value as the original 'time between purchase' column.

MichelleH

@sarahi6 That would make sense that the "Avg Time Between Purchase" is the same, since the "First Purchase Date" and "Last Purchase Date" would be the same across all rows of the same Customer ID. If a customer has purchases on January 1, May 1, and August 1, then you would be comparing the difference between January 1 and August 1 for the customer overall.

RobSomers

@sarahi6 Are you wanting for each line to have the average time between purchases for all customers? If so, you'll want to use a Rank & Window tile to do that.

https://domohelp.domo.com/hc/en-us/articles/360042922814-Old-Magic-ETL-Tiles-Rank-and-Window

sarahi6

@RobSomers Yes, I want each and average time between purchases for all customers. Will I keep the group by function that I listed above, and then add the rank & window?

RobSomers

You won't need your group by tile, just the Rank & Window tile.

sarahi6

@RobSomers , did I set this up right? I clicked the link you provided but I am having a hard time understanding what I should put as my preceding and following values.

thanks!

RobSomers

I actually think a better and easier way to do this would be using the FIXED function. You can do this either using a formula tile or using a beast mode in a card. The formula will be like this:

AVG(AVG('Time between purchase')FIXED())

I don't think the FIXED function will show up in the list of formulas in the ETL, but it should still work.

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