<=EARLIER within a FILTER function

[kendall]

Hello, 

What would it mean to write <=EARLIER within a FILTER function? For example, the argument in this is: FILTER('Data Set X','Data Set X'[Index]<=EARLIER('Data Set X'[Index]))

Would this mean to do something earlier tha a given date in the data set?

Thanks, Kendall

[AlexisOlson]

EARLIER returns the earlier row context.

https://www.sqlbi.com/tv/earlier-earliest-dax-guide/

The DAX expression in your screenshot appears to be a calculated column and EARLIER allows you to reference the index value in that row of the table rather than the index value inside the FILTER iterator.