Half-Life, Units, and Memory Length

A half-life is reported as "120 bars". What is missing before anyone can use it?

• The bar size, so it can be turned into hours
• The p-value of the AR(1) fit
• Nothing; bars are the natural unit

In this path, what is the memory length L used for?

• The window of a rolling z-score on the test data
• Sizing the purge at the train/test seam
• The number of lags in the Engle-Granger test