
In TRADING IN THE ZONE,
Mark Douglas makes it clear that fundamental and technical analyses alone are not enough to make trading decisions.
For any trader to be truly successful, he must think in probabilities: the outcome of a single trade or a couple of trades is not enough to know whether you are profitable in the long term or not.
Mental analysis must be factored for a trader to make any headway in his career: your behaviour as a trader and those of other traders impact the markets remarkably.
Your trading psychology is extremely important in determining whether you succeed as a trader or not.