I read how to calculate the average DAU for a mobile application. I've seen the following formula but I doesn't work in my case.
Do you have an alternative solution?
It's easy to get the DAU per day thanks to a simple table with "day" dimension as rows and "unique visitors" metric as column.
As you mentioned about mobile applications, instead of daily active users. You can even go for daily engaged users which can be created by using processing rules.
Hope this helps.
To get the average daily users. Build a table with the Day dimension and then use Column Sum function to sum the unique visitors and count d of days in that view.