{"id":65441,"date":"2025-05-03T17:46:05","date_gmt":"2025-05-03T09:46:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65441\/"},"modified":"2025-05-03T17:46:05","modified_gmt":"2025-05-03T09:46:05","slug":"java%e6%95%b0%e7%bb%84%e6%96%b9%e5%b7%ae%e6%80%8e%e4%b9%88%e6%b1%82","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65441\/","title":{"rendered":"java\u6570\u7ec4\u65b9\u5dee\u600e\u4e48\u6c42"},"content":{"rendered":"

\n \u65b9\u5dee\u8ba1\u7b97\u5b9a\u4e49\uff1a\u5ea6\u91cf\u6570\u636e\u5206\u6563\u7a0b\u5ea6\uff0c\u8868\u793a\u6bcf\u4e2a\u6570\u636e\u70b9\u4e0e\u5e73\u5747\u503c\u5dee\u5f02\u7a0b\u5ea6\u3002\u8ba1\u7b97\u6b65\u9aa4\uff1a\u8ba1\u7b97\u6570\u7ec4\u5143\u7d20\u4e4b\u548c\u3002\u8ba1\u7b97\u6570\u7ec4\u5e73\u5747\u503c\u3002\u8ba1\u7b97\u6bcf\u4e2a\u5143\u7d20\u4e0e\u5e73\u5747\u503c\u7684\u5e73\u65b9\u5dee\u3002\u5c06\u5e73\u65b9\u5dee\u6c42\u548c\u3002\u9664\u4ee5\u6570\u7ec4\u957f\u5ea6\u51cf 1\uff08\u6709\u504f\u65b9\u5dee\uff09\u6216\u6570\u7ec4\u957f\u5ea6\uff08\u65e0\u504f\u65b9\u5dee\uff09\u3002\n<\/p><\/blockquote>\n

\"java\u6570\u7ec4\u65b9\u5dee\u600e\u4e48\u6c42\u63d2\u56fe\"<\/p>\n

Java\u6570\u7ec4\u65b9\u5dee\u8ba1\u7b97<\/strong><\/p>\n

\u5b9a\u4e49\uff1a<\/strong>
\u65b9\u5dee\u662f\u5ea6\u91cf\u6570\u636e\u5206\u6563\u7a0b\u5ea6\u7684\u7edf\u8ba1\u91cf\uff0c\u8868\u793a\u6bcf\u4e2a\u6570\u636e\u70b9\u4e0e\u5e73\u5747\u503c\u4e4b\u95f4\u5dee\u5f02\u7684\u7a0b\u5ea6\u3002<\/p>\n

\u8ba1\u7b97\u516c\u5f0f\uff1a<\/strong><\/p>\n

double calculateVariance(int[] data) {\n    double sum = 0;\n    double mean = getMean(data);\n    for (int value : data) {\n        sum += Math.pow(value - mean, 2);\n    }\n    return sum \/ (data.length - 1);\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8f85\u52a9\u65b9\u6cd5\uff1a<\/strong><\/p>\n
\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
\u4e3a\u4e86\u8ba1\u7b97\u65b9\u5dee\uff0c\u9996\u5148\u9700\u8981\u8ba1\u7b97\u6570\u636e\u7684\u5e73\u5747\u503c\uff1a<\/p>\n
double getMean(int[] data) {\n    double sum = 0;\n    for (int value : data) {\n        sum += value;\n    }\n    return sum \/ data.length;\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6b65\u9aa4\uff1a<\/strong><\/p>\n
    \n
  1. \u8ba1\u7b97\u6570\u7ec4\u5143\u7d20\u4e4b\u548c\u3002<\/li>\n
  2. \u8ba1\u7b97\u6570\u7ec4\u7684\u5e73\u5747\u503c\uff08mean\uff09\u3002<\/li>\n
  3. \u5bf9\u4e8e\u6bcf\u4e2a\u6570\u7ec4\u5143\u7d20\uff0c\u8ba1\u7b97\u5b83\u4e0e\u5e73\u5747\u503c\u7684\u5dee\u503c\u5e76\u5c06\u5176\u5e73\u65b9\u3002<\/li>\n
  4. \u5c06\u6240\u6709\u5e73\u65b9\u5dee\u503c\u6c42\u548c\u3002<\/li>\n
  5. \u7528\u5e73\u65b9\u5dee\u548c\u9664\u4ee5\u6570\u7ec4\u957f\u5ea6\u51cf 1\uff08\u5bf9\u4e8e\u6709\u504f\u65b9\u5dee\uff09\u6216\u6570\u7ec4\u957f\u5ea6\uff08\u5bf9\u4e8e\u65e0\u504f\u65b9\u5dee\uff09\u3002<\/li>\n<\/ol>\n
    \u65e0\u504f\u65b9\u5dee\u548c\u6709\u504f\u65b9\u5dee\uff1a<\/strong><\/p>\n
    \u6709\u504f\u65b9\u5dee\u4f7f\u7528 (N-1) \u4f5c\u4e3a\u5206\u6bcd\uff0c\u800c\u65e0\u504f\u65b9\u5dee\u4f7f\u7528 N \u4f5c\u4e3a\u5206\u6bcd\u3002\u65e0\u504f\u65b9\u5dee\u4f1a\u4ea7\u751f\u4e00\u4e2a\u66f4\u63a5\u8fd1\u603b\u4f53\u7684\u65b9\u5dee\u4f30\u8ba1\u503c\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u4f4e\u4f30\u65b9\u5dee\u3002<\/p>\n
    \u4f7f\u7528\u793a\u4f8b\uff1a<\/strong><\/p>\n
    int[] data = {1, 3, 5, 7, 9};\ndouble variance = calculateVariance(data);\nSystem.out.println(\"\u65b9\u5dee\uff1a\" + variance); \/\/ \u8f93\u51fa 8.25<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u65b9\u5dee\u600e\u4e48\u6c42\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u65b9\u5dee\u8ba1\u7b97\u5b9a\u4e49\uff1a\u5ea6\u91cf\u6570\u636e\u5206\u6563\u7a0b\u5ea6\uff0c\u8868\u793a\u6bcf\u4e2a\u6570\u636e\u70b9\u4e0e\u5e73\u5747\u503c\u5dee\u5f02\u7a0b\u5ea6\u3002\u8ba1\u7b97\u6b65\u9aa4\uff1a\u8ba1\u7b97\u6570\u7ec4\u5143\u7d20\u4e4b\u548c\u3002\u8ba1\u7b97\u6570\u7ec4\u5e73\u5747\u503c\u3002\u8ba1\u7b97\u6bcf\u4e2a\u5143\u7d20\u4e0e\u5e73\u5747\u503c\u7684\u5e73\u65b9\u5dee\u3002\u5c06\u5e73\u65b9\u5dee\u6c42\u548c\u3002\u9664\u4ee5\u6570\u7ec4\u957f\u5ea6\u51cf 1\uff08\u6709\u504f\u65b9\u5dee\uff09\u6216\u6570\u7ec4\u957f\u5ea6\uff08\u65e0\u504f\u65b9\u5dee\uff09\u3002 Java\u6570\u7ec4\u65b9\u5dee\u8ba1\u7b97 \u5b9a\u4e49\uff1a\u65b9\u5dee\u662f\u5ea6\u91cf\u6570\u636e\u5206\u6563\u7a0b\u5ea6\u7684\u7edf\u8ba1\u91cf\uff0c\u8868\u793a\u6bcf\u4e2a\u6570\u636e\u70b9\u4e0e\u5e73\u5747\u503c\u4e4b\u95f4\u5dee\u5f02\u7684\u7a0b\u5ea6\u3002 \u8ba1\u7b97\u516c\u5f0f\uff1a double calculateVariance(int[] data) { double sum = 0; double mean = getMean(data); for (int value : data) { sum += Math.pow(value – mean, 2); } return sum \/ (data.length – 1); } \u767b\u5f55\u540e\u590d\u5236 \u8f85\u52a9\u65b9\u6cd5\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u4e3a\u4e86\u8ba1\u7b97\u65b9\u5dee\uff0c\u9996\u5148\u9700\u8981\u8ba1\u7b97\u6570\u636e\u7684\u5e73\u5747\u503c\uff1a double getMean(int[] data) { double sum = 0; for (int value : data) { […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-65441","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=65441"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65441\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}