How do I calculate the average of the past 3 sales of an item?
Answers
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Hi @meekey
you’ll want to use a lag function to get the last three values. Typically I use this when doing a rolling average like you’re needing. I’ve done a write up on rolling average and lag functions here: https://dojo.domo.com/main/discussion/52679/domo-ideas-conference-beast-modes-rolling-averages
window functions require your CSM to enable them in your instance to use
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I see so many examples of lag functions that all reference a date, so since I don't care about date necessarily, do I just leave end it with over ()?
(lag((sale_price),1) over( ) +
lag((sale_price),2) over( ) +
lag((sale_price),3) over( ) +
)/3
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...also, I don't see LAG in my list of available functions... Sorry for such basic questions, Grant. Thanks for your help :)
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@meekey the OVER clause tells you what to partition by - in your case I'd assume you'd want to do it on your asset and then order by date descending so you could find the last 3 sales for each asset.
Something like: lag(
sale_price
OVERasset
ORDER BYsale_date
desc)I think you may have to reach out to your CSM to get the lag function enabled if it doesn't currently work in your instance.
2
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