Hi @nicholsn, thank you for your comment, this is a good point. 

My understanding was that the `data` entity would be a placeholder that would later be replaced by the input data (probably made of several nifty files and maybe ultimately modelled by multiple entities?), hence its rather vague naming `data`. 

However, the discussion of modelling `data scaling` is still underway and I am not sure I reflected correctly what was decided during the last call. Maybe @jbpoline, @nicholst or other attendees of out last NIDASH call ( @gllmflndn, @dbkeator, @drjturner, @karchie ) would be able to give us more details on this?