HJ AF
HJ AF
HJ AF refers to the Aggression Factor (a stat measuring the ratio of aggressive actions to passive actions) of a player specifically when they are in the hijack position.
Overview
HJ AF is a poker statistic used in online play and HUDs (Heads-Up Displays) to analyze a player's tendencies from the hijack position (the seat two to the right of the button). Aggression Factor (AF) is calculated as (Bets + Raises) / Calls. A higher AF indicates a player who prefers to bet or raise rather than call, while a lower AF suggests a more passive, calling-heavy style.
Relevance in Strategy
HJ AF is a subset of overall AF, isolating behavior from a specific position. Since the hijack is a late position with significant steal opportunities, a high AF here can indicate a player who frequently raises preflop and continues aggressively postflop. Conversely, a low AF may suggest a player who limps or calls too often, potentially exploitable by raising their blinds. For example, a typical LAG (Loose-Aggressive) player might have an HJ AF above 3.0, while a nit could have <1.5.
Usage in HUDs
Online players track HJ AF over a sample size (e.g., 100+ hands) to adjust their range. Against a high HJ AF, you might 3-bet lighter or trap with strong hands. Against a low AF, you can value-bet more freely. However, small sample sizes (e.g., <50 hands) can be misleading, especially if the player has faced different table dynamics.
Limitations
AF is less reliable in multi-way pots or when a player faces many all-ins. Also, a high AF combined with a low VPIP might indicate a player who only plays strong hands aggressively. Always consider AF alongside other stats like PFR, WTSD, and positional VPIP.
Conclusion
HJ AF is a valuable but narrow stat. Use it as part of a holistic opponent profile, not in isolation, and be mindful of sample size.