# Function diffPastWeek
diffPastWeek(
measure,name?):CalculatedMeasure
Creates a calculated measure that calculates the difference between this week's data and the data from the previous week for the given measure.
The date dimension will be dynamically taken from the query that uses the returned measure.
# Parameters
| Parameter | Type | Description |
|---|---|---|
measure | Measure | Measure to apply difference to |
name? | string | Name for the new measure |
# Returns
A calculated measure instance
# Example
Calculate the difference between this week's total cost and the previous week's total cost from the Sample Ecommerce data model.
measureFactory.diffPastWeek(measureFactory.sum(DM.Commerce.Cost))