Common Trading Mistakes: Systems, Stops, Risk, and Overfitting
Summary
This document lists recurring trading errors, including failing to define a system, abandoning stop losses, risking too much capital, setting stops without sound money management, relying on fixed profit targets instead of trailing stops, trading excessively, and overfitting. Examples of excuses for holding losing positions illustrate how traders may rationalize ignoring their original risk limits.
The material is a concise checklist rather than a detailed treatment. It gives no quantitative evidence, explicit rules for sizing positions or placing stops, or comparison of alternative exit methods. Its practical lesson is to make a strategy articulable, control exposure according to risk limits, and guard against excessive trading and fitting rules too closely to past data. The brief headings leave the recommended implementation and suitability for particular strategies unspecified.
Key ideas
- A trader should be able to describe the rules of their system clearly.
- Ignoring or repeatedly changing stop losses can undermine planned risk control.
- Position risk should follow money management rules rather than emotional conviction.
- Excessive trading and overfitting are identified as common sources of poor decisions.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.