{"description":"\u524d\u306e\u8a18\u4e8b\u3067\u4e8c\u9805\u4e71\u6570\u304b\u3089\u5e73\u5747\u3068\u5206\u6563\u3092\u63a8\u5b9a\u3059\u308b\u8a71\u3092\u66f8\u3044\u305f \u305f\u3068\u3048\u3070\u3001\u3042\u308b\u751f\u8d77\u78ba\u7387p\u3067n=20\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u3057\u305f\u3068\u3059\u308c\u3070 p <- pi/4 n <- 20 X <- sample(0:1,n,replace=TRUE,prob=c(1-p,p)) mean(X) var(X) sum((X-mean(X))^2)/n > mean(X) [1] 0.8 > var(X) [1] 0.1684211 > sum((X-mean(X))^2)/n [1] 0.16 \u3068\u306a\u308b\u3002 \u30d9\u30eb\u30cc\u30fc\u30a4\u5206\u5e03\u3067\u671f\u5f85\u5024\u304cq\u306a\u3089\u3001\u30d9\u30eb\u30cc\u30fc\u30a4\u5206\u5e03\u306f\u3067\u3001\u305d\u306e\u5206\u6563\u306f\u3067\u3042\u308b \u4e0a\u306e\u4f8b\u304b\u3089\u3059\u308c\u3070\u3001\u3067\u3001\u305d\u306e\u3068\u306a\u308a\u3001\u6a19\u672c\u304b\u3089\u306e\u4e0d\u504f\u5206\u6563\u3068\u306f\u2026","author_name":"ryamada22","provider_url":"https://hatena.blog","image_url":null,"height":"190","provider_name":"Hatena Blog","blog_url":"https://ryamada22.hatenablog.jp/","type":"rich","author_url":"https://blog.hatena.ne.jp/ryamada22/","width":"100%","version":"1.0","url":"https://ryamada22.hatenablog.jp/entry/20130823/1377143225","blog_title":"ryamada\u306e\u907a\u4f1d\u5b66\u30fb\u907a\u4f1d\u7d71\u8a08\u5b66\u30e1\u30e2","title":"\u30d9\u30eb\u30cc\u30fc\u30a4\u5206\u5e03\u306e\u30d1\u30e9\u30e1\u30bf\u3092\u63a8\u5b9a\u3059\u308b","categories":["\u5206\u6563","\u6a19\u672c\u5206\u6563","\u4e0d\u504f\u5206\u6563","\u671f\u5f85\u5024"],"published":"2013-08-23 12:47:05","html":""}