Winner Carreras Americanas [2021] -

# Fill NaNs race_history_df = race_history_df.fillna(0)

# Distance-specific win rate (precomputed per horse) race_history_df['dist_win_rate'] = ( race_history_df.groupby(['horse_id', 'distance'])['is_winner'] .transform('mean') ) winner carreras americanas

# Sort by horse and date race_history_df = race_history_df.sort_values(['horse_id', 'race_date']) # Fill NaNs race_history_df = race_history_df

# Average speed figure last 3 races race_history_df['avg_speed_last3'] = ( race_history_df.groupby('horse_id')['speed_figure'] .transform(lambda x: x.rolling(3, min_periods=1).mean()) ) winner carreras americanas