Power BI DAX Formula - dax

Question

I have a PBI star schema model. I'm trying to define a measure in the fact table using a numeric field (health index) that resides in one of the dimension tables and should correspond to the maximum date value (in the date dimension table) that is selected in the slicer. The measure is not something that is aggregated. A simple query joining the fact and dimension tables works fine and looks like this
Country
Date
Health Index
China
3/31/22
6
China
2/28/22
4
China
1/31/22
7
I want to be able to create a measure in the fact table called Current Health Index to display the data such that it shows the index value corresponding to the maximum date in the slicer, so if in the slicer the largest date selected is 3/31/22, I would like the measure to have a value of 6:
Country
Date
Health Index
China
3/31/22
6
I tried the following DAX formula but it gives me a very inflated value. I know the joins are correct, so I don't know what the problem is:
Health Index Current =
var _a =
MAXX(
ALLSELECTED('Dim Date Table'[Date])
,'Dim Date Table'[Date]
)
return
CALCULATE(
MAX('Dim Health Indexes Table'[Health Index])
,'Dim Date Table'[Date] = _a
)
Thanks for any assistance

Answer 1

I didn't get a clear picture with you case, but I'll comment your measure and hope this will help.
Health Index Current =
var _a =
MAXX(
ALLSELECTED('Dim Date Table'[Date])
,'Dim Date Table'[Date]
) -- ALLSELECTED() removes an inner context.
-- So, if you have only 1 layer of the context,
-- then ALLSELECTED()=ALL().
-- This can be the reason why you gets "very inflated value".
-- First, I'd check _a value as measure.
return
CALCULATE(
MAX('Dim Health Indexes Table'[Health Index])
,'Dim Date Table'[Date] = _a
) -- This looks correct.
-- You can try 'Dim Health Indexes Table'[Date]= _a
Try 'Dim Date Table' or VALUES(Dim Date Table'[Date]) instead of ALLSELECTED('Dim Date Table'[Date]) and you'll get the max in the context.
Or try VALUES('Dim Health Indexes Table'[Date]) instead of ALLSELECTED('Dim Date Table'[Date])

Answer 2

Hello please try this measure:
VERSION-1
Health Index Current =
VAR _a =
MAXX ( ALLSELECTED ( 'Dim Date Table'[Date] ), 'Dim Date Table'[Date] )
RETURN
CALCULATE (
MAX ( 'Dim Health Indexes Table'[Health Index] ),
'Dim Date Table'[Date] = _a,
'Dim Health Indexes Table'[Country]
= SELECTEDVALUE ( 'Dim Health Indexes Table'[Country], "China" )
)
VERSION-2
Health Index Current =
VAR _a =
MAXX ( ALLSELECTED ( Dim Date Table[Date] ), Dim Date Table[Date] )
RETURN
CALCULATE (
MAX ( Dim Health Indexes Table[Health Index] ),
FILTER (
SUMMARIZE (
Dim Health Indexes Table,
-- First argument of summarize should be your fact table.
Dim Health Indexes Table[Country],
Dim Date Table[Date]
),
Dim Date Table[Date] = _a
&& Dim Health Indexes Table[Country] = SELECTEDVALUE ( Dim Health Indexes Table[Country] )
)
)