NBA選手シーズンごとの平均得点

NBA選手のシーズン当たりの得点

 データを元にシーズン毎の平均得点の推移をグラフ化してみます。

外れ値を省くために、1シーズン40試合以上出場した選手で構成しています。

#! /usr/bin/env python  
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns


fn = "data/player_per_game.csv"
df = pd.read_csv(fn, index_col=0)

df2 = df[df["g"] >= 40]

des = df2.groupby("season")["PPG"].describe()
print(des)

	count	mean	std	min	25%	50%	75%	max
season
1950	183.0	8.178142	4.114657	1.7	5.000	7.40	10.800	27.4
1951	108.0	8.976852	4.619314	2.1	5.975	8.10	11.325	28.4
1952	94.0	9.263830	4.777610	1.3	6.100	8.75	12.000	25.4
1953	102.0	9.023529	4.408142	2.2	5.525	8.85	11.275	22.3
1954	91.0	8.651648	4.246943	1.6	5.900	8.20	10.450	24.4
1955	81.0	10.046914	5.192087	2.4	5.900	9.60	13.100	22.7
1956	80.0	10.177500	5.222056	2.4	6.525	8.85	13.225	25.7
1957	83.0	10.397590	5.245439	2.2	6.600	9.70	12.400	25.6
1958	78.0	11.506410	5.798216	3.4	7.400	9.40	16.400	27.8
1959	85.0	11.260000	5.994466	3.5	6.500	9.80	14.400	29.2
1960	87.0	11.886207	6.852264	3.0	7.350	9.90	14.350	37.6
1961	83.0	12.225301	7.547199	2.2	6.400	10.20	15.350	38.4
1962	100.0	12.348000	8.555221	1.5	6.050	10.35	15.950	50.4
1963	94.0	12.045745	7.262833	2.2	7.200	10.50	14.300	44.8
1964	102.0	11.489216	6.883585	1.7	5.775	9.90	15.775	36.9
1965	94.0	11.620213	6.724751	2.5	6.300	11.00	14.575	34.7
1966	103.0	11.838835	6.569899	2.6	7.300	10.70	15.350	33.5
1967	108.0	12.126852	6.489396	3.0	7.225	10.55	17.400	35.6
1968	136.0	11.949265	6.489273	2.0	6.550	11.65	16.625	29.2
1969	146.0	12.370548	6.392174	2.3	7.325	11.50	17.350	28.4
1970	154.0	12.246753	6.560719	2.1	7.200	11.50	15.550	31.2
1971	181.0	11.462431	6.616757	1.5	5.900	9.70	16.000	31.7
1972	189.0	11.605820	6.817438	1.5	5.900	11.10	15.700	34.8
1973	194.0	10.764433	6.656815	1.6	5.700	9.05	14.800	34.0
1974	184.0	10.810326	6.559276	1.8	5.575	9.30	14.975	30.6
1975	210.0	10.341429	6.244741	1.3	5.700	9.00	13.375	34.5
1976	199.0	10.492462	5.890430	1.7	5.900	9.20	13.850	31.1
1977	260.0	10.482308	5.847033	1.4	6.000	9.05	13.225	31.1
1978	259.0	10.945174	5.930006	2.0	6.250	9.60	14.750	27.2
1979	247.0	11.290283	6.263495	1.5	6.500	10.10	15.650	29.6
1980	248.0	11.283065	5.887415	2.5	6.600	10.25	14.900	33.1
1981	262.0	10.632824	5.939516	0.7	5.800	9.55	14.400	30.7
1982	270.0	10.534815	6.001231	1.3	5.700	9.80	14.350	32.3
1983	277.0	10.419134	6.093150	1.5	5.300	8.90	14.100	28.4
1984	262.0	10.524809	6.278965	1.3	5.425	9.00	14.500	30.6
1985	263.0	10.649810	6.560726	1.3	5.400	9.30	14.800	32.9
1986	260.0	10.577692	6.095973	0.6	5.375	9.25	14.300	30.3
1987	267.0	10.570412	6.424687	1.7	5.600	9.20	14.500	37.1
1988	275.0	10.619636	6.160800	1.1	6.000	9.50	14.200	35.0
1989	292.0	10.566438	6.399106	0.7	5.375	9.20	15.000	32.5
1990	312.0	10.410897	6.379762	1.1	5.175	8.95	14.700	33.6
1991	304.0	10.608224	6.295456	1.3	5.300	9.25	14.925	31.5
1992	310.0	10.226129	6.052927	1.1	5.100	9.20	14.175	30.1
1993	308.0	10.318831	6.016749	0.7	5.700	8.80	14.400	32.6
1994	304.0	10.280592	5.696689	1.7	5.675	9.25	14.125	29.8
1995	314.0	10.038854	5.879826	1.2	5.000	9.20	13.550	29.3
1996	343.0	9.868513	5.705394	0.3	5.100	9.10	13.300	30.4
1997	337.0	9.747478	5.926339	1.2	4.800	8.00	13.800	29.6
1998	342.0	9.711988	5.496349	1.1	5.300	9.00	13.275	28.7
1999	217.0	10.335945	5.207891	1.2	6.400	9.30	13.300	26.8
2000	327.0	9.568807	5.702088	0.8	5.400	8.10	12.500	29.7
2001	335.0	9.408955	5.914256	0.6	4.950	7.90	12.000	31.1
2002	332.0	9.771988	5.841670	1.1	5.100	8.40	12.950	31.4
2003	324.0	9.716667	6.016440	0.8	5.175	8.10	13.125	32.1
2004	348.0	9.454885	5.631074	0.9	4.900	7.95	13.225	28.0
2005	361.0	9.865097	5.911378	1.0	5.300	8.40	13.000	30.7
2006	345.0	9.857681	6.261762	1.1	5.000	8.60	13.000	35.4
2007	348.0	10.052299	6.163668	1.1	5.200	8.85	13.325	31.6
2008	342.0	10.047076	5.904616	0.9	5.725	8.65	13.100	30.0
2009	350.0	10.225143	5.957750	0.8	5.200	9.05	14.175	30.2
2010	348.0	10.136782	5.666940	0.7	6.000	8.90	13.800	30.1
2011	380.0	9.819211	5.582670	1.1	5.300	8.70	13.225	27.7
2012	305.0	9.887541	5.262952	1.0	5.500	9.30	12.700	28.0
2013	365.0	9.390959	5.262332	0.5	5.200	8.60	12.800	28.7
2014	366.0	9.807923	5.548187	1.6	5.525	9.05	13.200	32.0
2015	385.0	9.748052	5.014614	1.8	5.900	8.70	12.700	28.1
2016	360.0	9.875833	5.395877	1.3	5.900	8.70	12.700	30.1
2017	369.0	10.226016	5.935251	1.7	6.100	8.70	13.200	31.6
2018	355.0	10.488451	5.692110	1.4	6.050	9.20	13.500	30.4
2019	391.0	10.691560	5.802060	1.0	6.500	9.30	13.700	36.1
2020	335.0	11.280896	6.125054	1.5	6.600	9.80	15.050	34.3
2021	335.0	11.455224	6.338176	1.9	6.750	9.70	14.600	32.0
2022	384.0	10.966927	5.995893	2.2	6.400	9.25	14.450	30.6
2023	385.0	11.378701	6.651446	2.1	6.600	9.50	14.700	33.1
2024	376.0	11.025532	6.538390	1.7	5.975	9.35	14.700	33.9

plt.figure(figsize=(20, 6))
plt.xlim(1950, 2024)
plt.title("points per season")
sns.lineplot(data=des[["mean", "min", "max"]])
plt.show()

結果

最高得点(max)はシーズン得点王なのでよく知られている通りです。

1962年のウィルト・チェンバレン選手や1987年のマイケル・ジョーダン選手はグラフの山を作っています。

平均を見ると概ね10点超える辺りがレギュラー選手の得点と言えます。

1960〜70年代一時12点台と高く、2000年代に一時落ちてますが3Pが増えた現在は11点台となっています。