Tableau: last value calculation in calculated field - tableau-api

Question

my dataset is like this
KPI VALUE TYPE DATE
coffee break duration 11 0 30/06/2015
coffee break duration 12 0 31/07/2015
coffee break duration 10 0 30/11/2014
coffee break duration 10 0 31/12/2014
coffee expense 20 1 31/07/2015
coffee expense 20 1 31/12/2014
coffee consumers 15 -1 31/07/2015
coffee consumers 17 -1 31/12/2014
for Type, 0 means minutes, 1 means dollars and -1 means people
I want to get a table like this
KPI Year(date) YTD
coffee break duration 2015 11,5
coffee break duration 2014 10
....
YTD calculation is:
if sum([TYPE]) = 0 then avg([VALUE])
elseif sum([TYPE]) > 0 then sum([VALUE])
elseif sum([TYPE]) < 0 then [last value for the considered year]
end
By [Last value for the considered year] I mean the last entry available, in a year if my table is set to Year, otherwise it has to change dynamically based on what Timespan I want to show.
What can I do to have [last value for the considered year] as a calc field ready to use in my YTD calc?
Many thanks,
Stefania

Answer 1

If I understand your question, than you can use LOD in the IF statement
if sum(type) = 0 then avg([value])
elseif sum([type]) > 0 then sum(value)
elseif sum([type]) < 0 then max(if [date] = { INCLUDE kpi: max(date)} then [value] end)
end
If there are several values on the last day of the considered year, it would take the biggest value
I slightly modified your data to show that results are working correctly