Time analysis in Paginated reports

Hi wfreeman 

I build a sample for you, you may refer to the data model and code in this sample.

Calendar table:

Calendar =
VAR _T1 =
    ADDCOLUMNS (
        CALENDARAUTO (),
        "Year", YEAR ( [Date] ),
        "Month", MONTH ( [Date] ),
        "YearMonth",
            YEAR ( [Date] ) * 100
                + MONTH ( [Date] )
    )
VAR _T2 =
    ADDCOLUMNS ( _T1, "RANK", RANKX ( _T1, [YearMonth],, ASC, DENSE ) )
RETURN
    _T2

Relate Date column with Date column in your Fact table.

Measures:

Last Month Value = 
CALCULATE(SUM('Table'[Value]),PREVIOUSMONTH('Calendar'[Date]))

Change Percentage = 
VAR _Change = SUM('Table'[Value]) - [Last Month Value]
RETURN
DIVIDE(_Change,[Last Month Value])

Result is as below.

You may refer to this blog to build measures in Paginated reports.

For reference:

Create a paginated report based on a Power BI shared dataset

How to use measures in power bi report builder which was created in Power Bi dataset

Best Regards,
Rico Zhou

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