About Objective Function-OF (PBIAS and NSE)

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Javier Fernando Mendez Monroy

Aug 31, 2021, 9:37:32 AMAug 31
to EPIC / APEX Modeling Forum
Good morning.

I am evaluating the OF equation for my data. 

This equation is expressed as OF=√(〖(1-NSE)〗^2+〖(|PBIAS|+0.5)〗^2 ) (Wang, Yen, Liu, & Liu, 2014).

So, my question is if PBIAS must be assessed in percentage or as a number (e g, percentage=100% or number=1). 

And, in a perfect fit model, NSE=1 and PBIAS=0, so OF optimum should be 0.5?

Thanks for your help.
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