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Hi.
My question is simple: How do I save a percentage as a variable in DAX? In order to count Sharpe's ratio I'd need to perform a following calculation:
Profit - (-0,25%) / volatility. How do I save the -0,25% as a variable? Only way I figured was to make a measure containing -0,25 and then change the data type to percentage.
Thank you!
Solved! Go to Solution.
I think you need to understand a bit more about how percentages are saved, so here we go.
When a percentage is saved in Power BI it is saved as a decimal number (0,75) = 75%. When you select the modeling as percentage power bi is very smart and knows you want to see 75%. So it does that for you.
When calculating tho you would (most of the cases) use 0.75. Because if i want to calculate 75% of 1000 i can do 1000*0.75=750.
hence he said you might want to do it *100. (0.75*100=75%)
So to get back to your initial question when you save a measure with -0.25 and make it a percentage. The percentage is -25%. Calulating with -0.25% would be -0.0025.
i hope this helps 🙂
Quality over Quantity
Hello @GoingIncognito,
You can either save the format as Percentage:
VAR PercentValue = FORMAT([Your Expression],"Percent")
But if you want to use that variable in a calculation, you can use it like:
VAR PercentValue = [Your Expression]*100
Let me know if this is not what you want.
Do I follow your reasoning if I say that, Format() returns a string (eventhough I want a number). BUT as DAX is such a high level language, it automagically treats a string as a number when I use it in a calculation?
Yes, FORMAT returns string, you can either multiply by 100 or you can also use VALUE(FORMAT([Your Expression,"Percent")), but not sure if it works. Easiest solution is to multiply with 100.
Hello @GoingIncognito, did the solution work for you?
If yes, please mark the answer as solution so that others can find the solution easily.
Thanks.
The format option doesn't work - unfortunately - and I'm too stupid a person to comprehend how multiplyin by a hundred would help?
Didn't understand your question. Can you provide the measure here where you need to convert into Percentage?
Oh yes, indeed, I should have done so in the first place! Thank you for your patience.
My measure is something like:
Sharpe =
var risk free interest = (how can I save a percentage value here?)
return
divide( (3,3% - risk free interest ) , 10,8%)
I get the values 3,3% and 10,8% as measures. And for a measure I can set the data format to be percentage. But risk free interest I would like to input as a variable within the measure. How can I save a percentage value to a variable?
I think you need to understand a bit more about how percentages are saved, so here we go.
When a percentage is saved in Power BI it is saved as a decimal number (0,75) = 75%. When you select the modeling as percentage power bi is very smart and knows you want to see 75%. So it does that for you.
When calculating tho you would (most of the cases) use 0.75. Because if i want to calculate 75% of 1000 i can do 1000*0.75=750.
hence he said you might want to do it *100. (0.75*100=75%)
So to get back to your initial question when you save a measure with -0.25 and make it a percentage. The percentage is -25%. Calulating with -0.25% would be -0.0025.
i hope this helps 🙂
Quality over Quantity
YES! Of course -0.25% is -0.0025! Silly me for not thinking about this! Thank you so much!
So, if the value is 0.25, if you convert it into Percentage it is 25%, right?
So, you can just do 0.25*100 = 25.
Please let me know if this wasn't clear enough to understand.
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