Apply filter on CURRENTGROUP

[vs531]

Hi 

I am trying to calculate the difference between the last and previous observations for each ID. In the dataset, I have multiple observations for each ID over time. As a first step, I want to create a new table with the last and previous dates. I m using GROUPBY, but I cannot apply any filter to CURRENTGROUP. What would be a better approach to the problem?

Thanks 

NewTable =

GROUPBY(

    table,table[ID],

    "LastDate",MAXX(CURRENTGROUP(),table[DATE]),

    "PreviousDate", MAXX(FILTER(CURRENTGROUP(), table[DATE] < MAXX(CURRENTGROUP(),table[DATE]),table[DATE] )

    ))

[vs531]

Thanks @amitchandak 

[amitchandak · Accepted solution]

@vs531 , In case you need a new column

Diff =

var _max = maxx(filter(Table, [ID] = earlier([ID]) && [Date] < earlier([Date]) ) , [Date])
return
[Score]- Maxx(filter(Table, [ID] = earlier([ID]) && [Date] =_max ) , [Score])