In my case non-overlapping data would represent the scenario where futures prices (3 months) do not correspond to the futures spot prices in terms of delivery date. For example, futures settlement price (with 3 months delivery) on 01/01/2016 would represent the futures spot price on 01/04/2016 or should I just make 84 days horizon? Since various months consistent of different amount of days.
Chowdhury, A. R. (1991), Futures market efficiency: Evidence from cointegration tests. J. Fut. Mark., 11: 577–589. doi: 10.1002/fut.3990110506
I am trying to replicate this study, btw. So how exactly I should work out non-overlapping data?