trading statistics

Hi folks,

One question: what do you guys think, what are the most important statistics that should we keep observing when analysing a system's profitableness? like net profit (all winning-all losing) or win percentage, lose percentage. /in order to develop the system,realise its strenghts,weaknesses/

What are your favourites? (also please add how can it be calculated if its not obvious)

Happy trading !

It called a risk model

http://fxevolve.com/how-to-build-a-trading-risk-model/