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## Calculated column to compare current running total column to last activity date in previous month

Thank you for any help. Trying to get a calculated column 'Monthly_Change' that, for each row, subtracts the RT value on the last ActionDate in the previous month from the current RT value. Tried this, didn't work:

MonthlyChange = crf38_fieldactions[RT] - CALCULATE(SUM(crf38_fieldactions[RT]), LASTDATE(PREVIOUSMONTH(crf38_fieldactions[ActionDate])))

1 ACCEPTED SOLUTION
Super User

hi @lsealy ,

not sure if i fully get you, supposing you have a data table like:

 date RT 9/1/2023 4 9/9/2023 4 9/17/2023 1 9/25/2023 2 10/3/2023 3 10/11/2023 2 10/19/2023 2 10/27/2023 6 11/4/2023 4

try to add a calculated column like:

``````column =
VAR _prt=
MAXX(
TOPN(
1,
FILTER(data, data[date]<=EOMONTH(EARLIER(data[date]), -1)),
data[date]
),
data[RT]
)
RETURN
IF(
NOT ISBLANK(_prt),
[RT] - _prt
)``````

it worked like:

Super User

hi @lsealy ,

not sure if i fully get you, supposing you have a data table like:

 date RT 9/1/2023 4 9/9/2023 4 9/17/2023 1 9/25/2023 2 10/3/2023 3 10/11/2023 2 10/19/2023 2 10/27/2023 6 11/4/2023 4

try to add a calculated column like:

``````column =
VAR _prt=
MAXX(
TOPN(
1,
FILTER(data, data[date]<=EOMONTH(EARLIER(data[date]), -1)),
data[date]
),
data[RT]
)
RETURN
IF(
NOT ISBLANK(_prt),
[RT] - _prt
)``````

it worked like:

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