formula returns -100% when trying to get a delta value current yr vs past year

[Moe_M]

Hi,

I am trying to calculate a delta for a metric (this yr vs past year). delta = (TY/PY)-1.
If the PY value does not exist for an instance, it will give me an 'infinity' error. I was able to fix that with IFERROR function. but if TY value does not exist for an instance, I will get a -100% which is technically not an error and it will throw off the result for the next up hierarchy. what can I do about this? Thank you 

IFERROR((CALCULATE([sales],table,table[year] = 2023)/CALCULATE([sales],table,table[year] = 2022)-1),0)

[amitchandak]

@Moe_M , prefer a divide function

divide(CALCULATE([sales],table,table[year] = 2023),CALCULATE([sales],table,table[year] = 2022),0)

Also, use a date table and time intelligence 

with separate year/date table

Time Intelligence, Part of learn Power BI https://youtu.be/cN8AO3_vmlY?t=27510
Time Intelligence, DATESMTD, DATESQTD, DATESYTD, Week On Week, Week Till Date, Custom Period on Period,
Custom Period till date: https://youtu.be/aU2aKbnHuWs&t=145s

Power BI — Year on Year with or Without Time Intelligence
https://medium.com/@amitchandak.1978/power-bi-ytd-questions-time-intelligence-1-5-e3174b39f38a
https://www.youtube.com/watch?v=km41KfM_0uA

//Only year vs Year, not a level below

This Year = CALCULATE(sum('Table'[Qty]),filter(ALL('Date'),'Date'[Year]=max('Date'[Year])))
Last Year = CALCULATE(sum('Table'[Qty]),filter(ALL('Date'),'Date'[Year]=max('Date'[Year])-1))
diff = [This Year]-[Last Year ]
diff % = divide([This Year]-[Last Year ],[Last Year ])