calculate_expected_goals: Calculate the expected goals for all the shots in (a)...

In nhlscraper: Scraper for National Hockey League Data

Calculate the expected goals for all the shots in (a) play-by-plays

Description

calculate_expected_goals() scores shot events with nhlscraper's rolling XGBoost expected-goals models. The package ships the small preprocessing bundle and downloads needed boosters from the companion NHLxG model store into a local user cache on first use. Each shot is routed to the matching season vintage and one of six game-state partitions: sd (5v5), ev (other even strength), pp (power play), sh (short-handed), en (empty net against), and ps (penalty shot; trained on penalty-shot and shootout-style rows). The legacy model argument is accepted for backward compatibility but ignored.

Usage

calculate_expected_goals(play_by_play, model = NULL)

calculate_xG(play_by_play, model = NULL)

Arguments

play_by_play	data.frame of play-by-play(s) using the current public schema returned by gc_play_by_play(), gc_play_by_plays(), wsc_play_by_play(), or wsc_play_by_plays(). Legacy alias-only columns such as typeDescKey, period, SOGFor, SOGAgainst, and SOGDifferential are no longer backfilled by the xG scorer.
model	deprecated legacy model selector; ignored

Value

data.frame with one row per event (play) and added xG column

Examples

# May take >5s, so skip.

  pbp <- gc_play_by_play()
  pbp_with_xg <- calculate_expected_goals(play_by_play = pbp)

nhlscraper documentation built on June 29, 2026, 1:06 a.m.