How to get the value from a previous row when the column is text or boolean?

[justlogmein]

I normally use the below DAX to retrieve a value from a pevious row, which works fine if the MAX value is a number. But what do I do if I am trying to get a value from a column that is a text or boolean type?

=
CALCULATE
	(
	MAX
		(
		'Sample Data'[Sample Taken]
		),
	FILTER
		(
		'Sample Data',
		'Sample Data'[Sample Date] < EARLIER
			(
			'Sample Data'[Sample Date]
			)
		&& 'Sample Data'[Unit Number] = EARLIER
			(
			'Sample Data'[Unit Number]
			)
		)
	)

[tamerj1]

Hi @justlogmein 

please use

=
VAR CurrentDate = 'Sample Data'[Sample Date]
VAR CurrentUnitTable =
    CALCULATETABLE (
        'Sample Data',
        ALLEXCEPT ( 'Sample Data', 'Sample Data'[Unit Number] )
    )
VAR DatesBeforeTable =
    FILTER ( CurrentUnitTable, 'Sample Data'[Sample Date] < CurrentDate )
VAR PreviousDate =
    MAXX ( DatesBeforeTable, 'Sample Data'[Sample Date] )
RETURN
    MAXX (
        FILTER ( DatesBeforeTable, 'Sample Data'[Sample Date] = PreviousDate ),
        'Sample Data'[Sample Taken]
    )

[justlogmein]

Unfortunately I get an error.

[tamerj1]

@justlogmein 

Please try

=
VAR CurrentDate = 'Sample Data'[Sample Date]
VAR CurrentUnitTable =
    CALCULATETABLE (
        'Sample Data',
        ALLEXCEPT ( 'Sample Data', 'Sample Data'[Unit Number] )
    )
VAR DatesBeforeTable =
    FILTER ( CurrentUnitTable, 'Sample Data'[Sample Date] < CurrentDate )
VAR PreviousDate =
    MAXX ( DatesBeforeTable, 'Sample Data'[Sample Date] )
RETURN
    SELECTCOLUMNS (
        FILTER ( DatesBeforeTable, 'Sample Data'[Sample Date] = PreviousDate ),
        "@Taken", 'Sample Data'[Sample Taken]
    )

[Anonymous]

Hi @justlogmein ,

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Best Regards,
Gao
Community Support Team