Count the number of occurrences after associated date of certain value in Power BI - powerbi

Question

I'm conducting an exercise around examining test results after tutoring has occurred. Essentially looking at the rates of "pass" post tutoring within the context of a given student. Where the ultimate outcome would be:
pass rate after tutoring = [count passes]/[count test date] WHERE test date > tutoring date.
For example:
Ideally, the final output of the measure would be = 1 (1/1)
Would anyone be able to point me in the direction of achieving this through a Power BI measure?
I've attempted the following to get the single oc with no luck:
Measure 3 = CALCULATE(COUNT(Table[Test Pass?]),FILTER(Table,Table[Test Date]>CALCULATE(Min(Table[Tutoring Date]),FILTER(Table,Table[Tutor (?)] <> BLANK ))))
Where I would then use the student column in a matrix with the measure to group pass rates post tutoring by student

Answer 1

I have used this simple flat table data model:
You can calculate this with a measure that needs to be evaluated with your Student column:
Pass Rate After Tutoring =
VAR _tutor_date =
CALCULATE (
MAX ( 'Table'[Tutoring Date] ),
ALLEXCEPT ( 'Table', 'Table'[Student] )
)
VAR _tests_post_tutor =
CALCULATE (
COUNTROWS ( 'Table' ),
ALLEXCEPT ( 'Table', 'Table'[Student] ),
'Table'[Test Date] > _tutor_date
)
VAR _successes =
CALCULATE (
COUNTROWS ( 'Table' ),
ALLEXCEPT ( 'Table', 'Table'[Student] ),
'Table'[Test Date] > _tutor_date,
'Table'[Test Pass]
)
RETURN
DIVIDE ( _successes, _tests_post_tutor )
But this assumes that students are only tutored for one specific test, and are tutored once.