Formula
Standard error of win-rate estimate ≈ SD / sqrt(N/100), in BB/100, where N is hands.
Example
A 5 BB/100 realized win rate has a 95% confidence interval of roughly ±12 BB at 10,000 hands, ±4 BB at 100,000 hands, and ±1.2 BB at 1,000,000 hands. Sample size, not the realized number, determines confidence.
How StackEdge uses Sample Size
StackEdge tracks Sample Size automatically from your session log and surfaces it across the analytics dashboard, alongside related metrics — broken down by game type, venue, stakes, day of week, and time of day. See the full analytics suite →
Related terms
- BB/100 — Big blinds won per 100 hands — the standard cash-game win-rate metric.
- Variance — The statistical spread of your poker results around your expected win rate.
- Win Rate — Long-term profit rate, in BB/100 for cash or ROI for tournaments.
- ROI — Return on investment — average profit per dollar of tournament buy-in.
