business-intelligence,powerpivot,dax,powerbi , Powerpivot: Subtract first member of group

## Question:

Consider the following table:

``````Group ID    Date
1001        2014-01-05
1001        2014-01-12
1001        2014-01-22
1002        2014-01-15
1002        2014-01-19
``````

How may I calculate the Duration inside a group in days? Duration is defined as Date[k] - Date[0]

e.g.: The desired table should look like:

``````Group ID    Date          Duration
1001        2014-01-05    0
1001        2014-01-12    7
1001        2014-01-22    17
1002        2014-01-15    0
1002        2014-01-19    4
``````

I have tried using MINX to return the group's first Date value:

=MINX(FILTER(Table;Table[Group ID] = Table[Group ID]); Table[Date])

But the value returned is the entire table's minimum, as if FILTER is returning the entire table.

It's not clear whether you are trying to produce a Calculated Column or a Measure - you should probably be trying the later but it can be done either way.

The calculated column would simply be:

``````= [Date] - CALCULATE(MIN(Table[Date]), FILTER(Table, Table[Group_ID] = EARLIER(Table[Group_ID])))
``````

Far more powerful are Measures! You could get this date

``````[Raw Measure] = MAX(Table[Date]) - CALCULATE(MIN(Table[Date]), ALL(Table[Date]))
``````

This works because the ALL() opens up the filter context on the Date column whilst retaining the filter on the group.

You would need to iterate over this measure as it would object to the total, in this example you could use:

``````[Iterated Measure] = SUMX(Table, [Raw Measure])
``````

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