Hello there
There are several steps to calculating metrics.
- Steps: first, collect the data from the various sources; make sure this data is free from ant errors.
- After completing the data, apply the formula.
- I think this calculation mentions the sum, average, and other methods.
- This process ensures accurate and meaningful metrics.
I hope this will be helpful for you. For more information, you can check out this thread 
How to create measures in dimensional tables without time dimensions