I am trying to compute a percentage difference between two values - market index levels separated by a period of time (the period will be determined by user input in a Power BI Slicer tool). I don't understand how I can cross reference values DAX uses by the associated date.
Value % difference from Value =
VAR __BASELINE_VALUE = SUM('Equity Markets (2)'[Value])
VAR __VALUE_TO_COMPARE = SUM('Equity Markets (2)'[Value])
RETURN
IF(
NOT ISBLANK(__VALUE_TO_COMPARE),
DIVIDE(__VALUE_TO_COMPARE - __BASELINE_VALUE, __BASELINE_VALUE)
)
"Value" is a column in a table "Equity Markets (2)" the table also includes a "Date" column.
What is the syntax for selecting a value from Value based on an associated date?
Apologies for asking such a basic question - feels like 30 sec of googling should have done it for me.
The slicer is engaging with the bar graph correctly - I know becouse I'm measuring the levels. I think all the % changes are zero because I'm evaluating x/x -1