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# 確率分布の成り立ちを理解してスポーツにあてはめてみる

Sports Analyst Meetup #5 LT発表
「確率分布の成り立ちを理解してスポーツにあてはめてみる」

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### 確率分布の成り立ちを理解してスポーツにあてはめてみる

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4. 4. Univariate Distribution Relationships Lawrence M. LEEMIS and Jacquelyn T. MCQUESTON http://www.math.wm.edu/~leemis/2008amstat.pdf
5. 5. .2 2 2 1 1 1
6. 6. # # p = 0.7 trial_size = 10000 rd.seed(71) # data = st.bernoulli.rvs(p, size=trial_size) # # p = 0.7 trial_size = 10000 rd.seed(71) # data = st.bernoulli.rvs(p, size=trial_size) h = plt.hist(data, normed=True, color=red, label="rvs", alpha=0.8) width = np.diff(h[1]).mean() # plt.bar([0.1, 0.9], [(1-p)/width, p/width], width=width, color="b", label="Theoretical", alpha=0.8) plt.legend(loc="best") plt.show()
7. 7. 2 0 1 2 5 ( ( 0 . . 3 . . 7= % . . 3 . . . 7= % %
8. 8. # def gen_bern_var(p, n): return(np.sum(st.bernoulli.rvs(p, size=n))) # p = 0.7 trial_size = 100000 set_size = 30 rd.seed(71) result = [gen_bern_var(p, set_size) for _ in range(trial_size)] hist_range = np.arange(np.min(result), np.max(result)+1) xx = np.arange(0, set_size) plt.figure(figsize=(10,6)) h = plt.hist(result, normed=True, bins=hist_range, color=red, label="rvs") plt.bar(xx+0.5, st.binom.pmf(xx, n=set_size, p=p), width=1, alpha=0.5, label="Theoretical") plt.legend(loc="best") plt.title(f"binomial distribution trial_size={trial_size}, set_size:{set_size}, p:{p}") plt.show() n_success: 4655, trial_size:100000 empirical:0.04655, theoretical:0.04644
9. 9. https://www.kaggle.com/kenmatsu4/basket-shot-log-binom B A 2 2 N 2 0
10. 10. 2 0 https://www.kaggle.com/dansbecker/nba-shot-logs
11. 11. . 1 c 0 1 13
12. 12. https://www.kaggle.com/kenmatsu4/basket-shot-log-poisson A B N
13. 13. https://www.kaggle.com/dansbecker/nba-shot-logs
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15. 15. # set_size = 20000 ; p = 0.1 trial_size = 50000 result = [gen_bern_var(p, set_size) for _ in range(trial_size)] xx = np.arange(np.percentile(result, 0.01), np.percentile(result, 99.99)) # confidence interval ci = st.norm.interval(0.95, loc=set_size*p, scale=np.sqrt(set_size*p*(1-p))) print(f"lower:{ci[0]}, upper:{ci[1]}") plt.figure(figsize=(10,6)) plt.plot(xx, st.norm.pdf(xx, set_size*p, np.sqrt(set_size*p*(1-p))), alpha=0.8, label="Theoretical") plt.hist(result, normed=True, bins=30, color=red, label="rvs", alpha=0.7) plt.title(f"normal distribution trial_size={trial_size}, set_size:{set_size}, p:{p}") plt.legend(loc="best") plt.show() 0.95 confidence interval lower:1916.8 upper:2083.2
16. 16. https://www.slideshare.net/matsukenbook/rev012 75 31 9 2 6 0 8 4 .
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19. 19. EOF