Ist it possible to combine dimensions and metrics in calculated fields? - google-analytics

Question

We have the variables:
"Unique User"
"Version" (Plus, Light in a ratio 79:21 from all Unique User)
"total Events"
"Eventkatagories".
And following scenario:
We can't get the exact data how many users are plus or light users.
But we know how many events are triggered by version (plus/light).
Now we want to know how the relative frequency of events triggered grouped by Version and event category.
So in a pivot table there is the row dimension = Version and the column Dimension = event category.
So the measurement should be the relative frequency.
So the simple custom calculated field should be "total events / users"... But remember we can't get the absolute value of Users by Version, we just know the ratio (80-20).
So I build another calculated field called UsersbyVersion with following statement:
CASE
WHEN (Version = "light") THEN SUM(User) * 0.21
WHEN (Version = "Plus") THEN SUM(User) * 0.79
END
But this formula gives following error:
Invalid formula - Invalid input expression. - Failed to parse CASE
statement
If I use absolute numbers for the statement it works.
Example:
CASE
WHEN (Version = "Normal") THEN 5000
WHEN (Version = "Plus") THEN 25000
END
But we need the statement "User * ration" ... the ratio won't change a lot but the user value in relation to the date we want to set on the Data Studio Report.
So I guess the problem is that the statement won't work with a combination of metrics and dimensions.
I already tried putting the "User * 0.79" and "User * 0.21" in custom metrics but this won't work aswell.
Is there a way to combine dimensions and metrics in a calculated field as an measurement?
Thx for your help

Answer 1

Create 2 metrics -
users * 0.2 (lets call this UsersP2)
users * 0.8 (lets call this UsersP8)
Now this should work
CASE
WHEN (Version = "light") THEN UserP2
WHEN (Version = "Plus") THEN UserP8
END
Dataset
Result