Barny, I believe they are different names for what are essentially independant variables. Depends on the science or discipline (Vortech's context I think).

In a nutshell, a dependant variable is derived from one or more independant variables. In a racing context the independant variables barrier draw, days since last start, track condition etc. combine to make the dependant variable, finishing position.

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Pixie

"It's worth remembering that profit isn't profit until it's spent off the racecourse." -- Crash