{"id":6438,"date":"2025-10-12T19:06:43","date_gmt":"2025-10-12T11:06:43","guid":{"rendered":"http:\/\/192.168.1.29\/?p=6438"},"modified":"2025-10-12T19:06:44","modified_gmt":"2025-10-12T11:06:44","slug":"r-%e4%b8%ad%e8%af%bb%e5%8f%96-csv-%e6%96%87%e4%bb%b6%e5%b9%b6%e5%a4%84%e7%90%86%e7%bc%ba%e5%a4%b1%e5%80%bc","status":"publish","type":"post","link":"http:\/\/xc.ipyingshe.net:5347\/?p=6438","title":{"rendered":"R \u4e2d\u8bfb\u53d6 CSV \u6587\u4ef6\u5e76\u5904\u7406\u7f3a\u5931\u503c"},"content":{"rendered":"\n

\u5728 R \u4e2d\u8bfb\u53d6 CSV \u6587\u4ef6\u5e76\u5904\u7406\u7f3a\u5931\u503c\u662f\u6570\u636e\u6e05\u6d17\u7684\u91cd\u8981\u6b65\u9aa4\u3002\u4ee5\u4e0b\u662f\u5177\u4f53\u65b9\u6cd5\u548c\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n\n\n\n

    \n
  1. \u8bfb\u53d6 CSV \u6587\u4ef6\u5e76\u8bc6\u522b\u7f3a\u5931\u503c
    \u4f7f\u7528 read.csv() \u51fd\u6570\u8bfb\u53d6\u6587\u4ef6\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7 na.strings \u53c2\u6570\u6307\u5b9a\u54ea\u4e9b\u503c\u5e94\u88ab\u8bc6\u522b\u4e3a\u7f3a\u5931\u503c\uff08NA\uff09\u3002<\/li>\n<\/ol>\n\n\n\n

    \u793a\u4f8b\uff1a\u8bfb\u53d6 CSV \u6587\u4ef6\u5e76\u5c06 “NULL” \u548c “?” \u8bc6\u522b\u4e3a\u7f3a\u5931\u503c<\/h1>\n\n\n\n

    data <- read.csv(“data.csv”, na.strings = c(“NULL”, “?”))<\/p>\n\n\n\n

      \n
    1. \u68c0\u67e5\u7f3a\u5931\u503c
      \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u68c0\u67e5\u6570\u636e\u4e2d\u7684\u7f3a\u5931\u503c\uff1a<\/li>\n<\/ol>\n\n\n\n

      \u68c0\u67e5\u6bcf\u5217\u7684\u7f3a\u5931\u503c\u6570\u91cf<\/h1>\n\n\n\n

      colSums(is.na(data))<\/p>\n\n\n\n

      \u68c0\u67e5\u6570\u636e\u6846\u4e2d\u662f\u5426\u5b58\u5728\u7f3a\u5931\u503c<\/h1>\n\n\n\n

      anyNA(data)<\/p>\n\n\n\n

        \n
      1. \u5904\u7406\u7f3a\u5931\u503c
        \u6839\u636e\u9700\u6c42\uff0c\u53ef\u4ee5\u9009\u62e9\u5220\u9664\u6216\u586b\u5145\u7f3a\u5931\u503c\u3002
        (1) \u5220\u9664\u7f3a\u5931\u503c
        \u5220\u9664\u5305\u542b\u7f3a\u5931\u503c\u7684\u884c\uff1a
        data_cleaned <- na.omit(data)
        \u5220\u9664\u7279\u5b9a\u5217\u7684\u7f3a\u5931\u503c\uff1a
        data_cleaned <- data[!is.na(data$column_name), ]
        (2) \u586b\u5145\u7f3a\u5931\u503c
        \u7528\u5747\u503c\u586b\u5145\uff1a
        2025\/10\/12 19:3
        Bing Writer \u2022 Generated with AI 2\/2
        data$column_name[is.na(data$column_name)] <- mean(data$column_name, na.rm = TRUE)
        \u7528\u4e2d\u4f4d\u6570\u586b\u5145\uff1a
        data$column_name[is.na(data$column_name)] <- median(data$column_name, na.rm = TRUE)
        \u7528\u7279\u5b9a\u503c\u586b\u5145\uff1a
        data$column_name[is.na(data$column_name)] <- 0 # \u6216\u5176\u4ed6\u503c<\/li>\n\n\n\n
      2. \u66ff\u6362\u7279\u5b9a\u503c\u4e3a NA
        \u5982\u679c\u6570\u636e\u4e2d\u67d0\u4e9b\u503c\uff08\u5982 999\uff09\u8868\u793a\u7f3a\u5931\u503c\uff0c\u53ef\u4ee5\u5c06\u5176\u66ff\u6362\u4e3a NA\uff1a
        data[data == 999] <- NA<\/li>\n\n\n\n
      3. \u4fdd\u5b58\u6e05\u6d17\u540e\u7684\u6570\u636e
        \u5c06\u5904\u7406\u540e\u7684\u6570\u636e\u4fdd\u5b58\u4e3a\u65b0\u7684 CSV \u6587\u4ef6\uff1a
        write.csv(data_cleaned, “cleaned_data.csv”, row.names = FALSE)
        \u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u4f60\u53ef\u4ee5\u7075\u6d3b\u5730\u5904\u7406 CSV \u6587\u4ef6\u4e2d\u7684\u7f3a\u5931\u503c\uff0c\u786e\u4fdd\u6570\u636e\u8d28\u91cf\u9002\u5408\u540e\u7eed\u5206\u6790<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

        \u5728 R \u4e2d\u8bfb\u53d6 CSV \u6587\u4ef6\u5e76\u5904\u7406\u7f3a\u5931\u503c\u662f\u6570\u636e\u6e05\u6d17\u7684\u91cd\u8981\u6b65\u9aa4\u3002\u4ee5\u4e0b\u662f\u5177\u4f53\u65b9\u6cd5\u548c\u4ee3 Continue Reading<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-6438","post","type-post","status-publish","format-standard","hentry","category-r"],"_links":{"self":[{"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/6438","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6438"}],"version-history":[{"count":1,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/6438\/revisions"}],"predecessor-version":[{"id":6439,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/6438\/revisions\/6439"}],"wp:attachment":[{"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6438"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/xc.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}