Trying to compare the difference between 2 dates recursively?

[Pete_81]

Hi all

I have a list of dates (from a column called Report Dates) and a list of values (result of COUNTA from a column called "Backlog") in a Matrix visual. 

 

I want to add a new row/Value which shows the difference between the current Report Date and the previous Report Date.

I.e : 

Nov 12th would have +18 next to it as it's an increase of 12 from Nov 5th.

How would i go about doing this?

[VahidDM]

Hi @Pete_81 

You can use a measure to add a new column to the matrix to show the variance, Try this measure:

Measure = 
Var _M = Max(table[Report Dates])
Var _M1 = calculate(Max(table[Report Dates]),filter(all(table),table[Report Dates])<_M))
return
COUNTA(table[Backlog]) - calculate(COUNTA(table[Backlog]),filter(all(table),table[Report Dates])=_M1))

If this post helps, please consider accepting it as the solution to help the other members find it more quickly.
Appreciate your Kudos!!
LinkedIn: www.linkedin.com/in/vahid-dm/

[Pete_81]

Hi @VahidDM - your example appears to contain 10 opening braces ( but 12 closing braces? )

Have I missed something?

[VahidDM · Accepted solution]

Hi @Pete_81 

try this:

Measure = 
Var _M = Max(table[Report Dates])
Var _M1 = calculate(Max(table[Report Dates]),filter(all(table),table[Report Dates]<_M))
return
COUNTA(table[Backlog]) - calculate(COUNTA(table[Backlog]),filter(all(table),table[Report Dates]=_M1))

If this post helps, please consider accepting it as the solution to help the other members find it more quickly.
Appreciate your Kudos!!
LinkedIn: www.linkedin.com/in/vahid-dm/

[Pete_81]

That's great, thank you!