Modelling Quality
Platforms & ToolsThe MT4 tester's score for how faithfully it rebuilt price inside each bar. It decides whether a stop or target was hit first — and can invent an edge.
Modelling quality is the percentage the MetaTrader 4 strategy tester reports after a backtest, describing how faithfully it reconstructed price movement inside each bar. It rises with the granularity of the input: open-price modelling is fast and close to meaningless, control points is a rough interpolation, and every tick reaches 90% using the platform's own history.
The figure matters because the intrabar path decides whether a stop or a take-profit was hit first. A strategy with tight stops can be reliably profitable at low modelling quality and reliably unprofitable on real ticks, purely as an artefact of the reconstruction. Anything intraday needs genuine tick data, a variable spread rather than a fixed one, and a walk-forward check afterwards. A 90% figure describes the quality of the data, never the quality of the strategy.