how to make first and last row value zero with parameter

[Shahzz77]

I am trying to make my first and last row value as zero . I used switch function to do it .

I have a parameter tenure with values 1 2 3 4 5 and forecasted parameter 2021,2022,2023,2024.......

If my tenure is 4 and forecasted year is 2022 then my 2022-4=2018 i.e value of forecasted year and value of year < 2018 should get zero. 
so that i can take the sum of value from 2018+2019+2020+2021 from the table1.

newmeasure = selectedvalue[timeperiod]-tenure

new column =
var forecastedyear= year(today())+1
return
switch(true(),
year(sample[timeperiod].year = forecastedyear,0,
year(sample[timeperiod].year < newmeasure,0
return
table1 

Year	value	new column
2017	1	1
2018	1	1
2019	1	1
2020	1	1
2021	1	1
2022	1	0

Problem in the dax is when i am passing the newmeasure in my new column dax it is making only forecasted value zero , but value less than year 2018 is still the same . 

[Greg_Deckler]

@Shahzz77 It's generally not advisable to use a measure as part of a calculated column. What happens in you column if you just simply return newmeasure?

[Shahzz77]

if i am not using it as a colum then how do i select my slect my years to get considered ..what dax i have to write..  time period values how to slect