Evaluating same-day opening range entry rules

Lock the full same-day procedure

The evaluated procedure enters at the regular-session open and exits at that same session close. Pre-open price, the prior close, and pre-open volume are the session inputs used to compute overnight percent change before regular hours begin.

Editorial reading: an Opening range breakout idea is not ready to judge until the pre-session filter, the regular-hours open fill, the same-day exit, and the stand-aside cases are written as one Rule-based entry procedure.

Session inputs before the open

Those pre-open prints were captured near 9:25 ET, ahead of the 9:30 ET regular-session open. The inspection window linking pre-open activity to regular-hours movement ran from 1 February 2006 through 31 July 2006.

Price filters and sample slices

Short-side eligibility is constrained to names priced above 6. Long-side outcomes are reviewed after the sample is sliced by price range.

Write the rules before judging them

Entry and exit rules are treated as evaluable only after they are written as explicit procedures and then backtested. One described rule set times entries and exits from price, volume, and a slow stochastic while keeping the indicator set small.

A request for reusable system code asked whether the snippet implemented trend-following, breakout, oscillation, or a dynamic switch among those modes.

Editorial reading: that classification question is useful only after the open fill, the same-session close, and the cases that stand aside are already explicit. A small indicator set does not replace those locked steps.