DAX Error - OFFSET's parameters were successfully resolved, but argument number 4 was unused.

[BugmanJ]

Good Afternoon All,

What am I trying to do?
Nelson Rule 4, Fourteen or more points in a row alternate in direction, increasing then decreasing.

My Data
Simplistic, one column with index ([Index]), one column with date ([Date]), one column with value ([Valued]). Table is known as "MyData"

Problem
When using the following code, I get the error "OFFSET's parameters were successfully resolved, but argument number 4 was unused"

Code:

NelsonRule4Violation = 
VAR NumPoints = 14
VAR Data = sum('MyData'[Valued])
VAR RowNumber = ROW("Test", sum('MyData'[Valued]))
VAR SwitchCount =
    SUMX (
        FILTER (
            ADDCOLUMNS (
                'MyData',
                "CurrentValue", 'MyData'[Valued],
 "NextValue", IF(RowNumber + NumPoints <= COUNTROWS('MyData'), OFFSET(Data, RowNumber + NumPoints - 1, 0,0,0,0), BLANK())
            ),
            IF (
                ISBLANK([NextValue]),
                0,
                IF (
                    SIGN([NextValue] - [CurrentValue]) <> SIGN([CurrentValue] - OFFSET(Data, RowNumber - 1, 0,0,0,0)),
                    1,
                    0
                )
            ) = 1
        ),
        1
    )
RETURN
    IF (
        SwitchCount >= NumPoints,
        "Out of Control",
        "In Control"
    )

Whats wrong with the code?
 

[lbendlin]

Interesting problem.  Please provide sample data and show expected outcome.