{"id":25996,"date":"2023-12-07T02:19:04","date_gmt":"2023-12-07T02:19:04","guid":{"rendered":"https:\/\/masterskills.org\/blog\/chon-mau-ngau-nhien-he-thong-systematic-sampling-trong-thong-ke-la-gi.html"},"modified":"2023-12-22T11:24:21","modified_gmt":"2023-12-22T04:24:21","slug":"chon-mau-ngau-nhien-he-thong-systematic-sampling-trong-thong-ke-la-gi","status":"publish","type":"post","link":"https:\/\/masterskills.org\/blog\/chon-mau-ngau-nhien-he-thong-systematic-sampling-trong-thong-ke-la-gi.html","title":{"rendered":"Ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng (Systematic Sampling) trong th\u1ed1ng k\u00ea l\u00e0 g\u00ec?"},"content":{"rendered":"<div class=\"vnbcbc-body vceditor-content wi-active\" data-role=\"content\">\n<div class=\"VCSortableInPreviewMode\" type=\"Photo\" style=\"\">\n<div><\/div>\n<div class=\"PhotoCMS_Caption\">\n<p>H\u00ecnh minh h\u1ecda. Ngu\u1ed3n: Analytics Vidhya<\/p>\n<\/div>\n<\/div>\n<h2><font style=\"line-height: 22px; font-size: 22px;\" color=\"#3d85c6\">Ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng<\/font><\/h2>\n<p><b>Kh\u00e1i ni\u1ec7m<\/b><\/p>\n<p><b>Ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng<\/b> trong ti\u1ebfng Anh l\u00e0\u00a0<b>systematic sampling<\/b>.<\/p>\n<p><i>Ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng<\/i> l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ch\u1ecdn m\u1eabu m\u00e0 m\u1ed7i \u0111\u01a1n v\u1ecb m\u1eabu \u0111\u01b0\u1ee3c ch\u1ecdn c\u0103n c\u1ee9 v\u00e0o t\u1eebng kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh t\u1eeb danh s\u00e1ch \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp s\u1eb5n c\u1ee7a t\u1ed5ng th\u1ec3 chung.\u00a0<\/p>\n<h3><font style=\"line-height: 22px; font-size: 22px;\" color=\"#3d85c6\">C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng<\/font><\/h3>\n<p>Tr\u00ecnh t\u1ef1 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh nh\u01b0 sau:<\/p>\n<p>&#8211; Tr\u01b0\u1edbc h\u1ebft s\u1eafp x\u1ebfp c\u00e1c \u0111\u01a1n v\u1ecb t\u1ed5ng th\u1ec3 theo tr\u00ecnh t\u1ef1 n\u00e0o \u0111\u00f3,\u00a0sau \u0111\u00f3 \u0111\u00e1nh s\u1ed1 th\u1ee9 t\u1ef1 c\u00e1c \u0111\u01a1n v\u1ecb trong danh s\u00e1ch (V\u00ed d\u1ee5: t\u0103ng d\u1ea7n ho\u1eb7c gi\u1ea3m d\u1ea7n c\u1ee7a l\u01b0\u1ee3ng bi\u1ebfn theo ti\u00eau th\u1ee9c c\u1ea7n nghi\u00ean c\u1ee9u; ho\u1eb7c theo v\u1ea7n A, B, C,&#8230;).<\/p>\n<p>&#8211; C\u0103n c\u1ee9 v\u00e0o tr\u1eadt t\u1ef1 s\u1eafp x\u1ebfp n\u00e0y, sau m\u1ed9t kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh l\u1ea1i ch\u1ecdn ra m\u1ed9t \u0111\u01a1n v\u1ecb m\u1eabu, sau \u0111\u00f3 c\u1ee9 c\u00e1ch \u0111\u1ec1u d \u0111\u01a1n v\u1ecb l\u1ea1i ch\u1ecdn ra 1 \u0111\u01a1n v\u1ecb v\u00e0o m\u1eabu,\u2026c\u1ee9 nh\u01b0 th\u1ebf cho \u0111\u1ebfn khi ch\u1ecdn \u0111\u1ee7 s\u1ed1 \u0111\u01a1n v\u1ecb c\u1ee7a m\u1eabu. Kho\u1ea3ng c\u00e1ch \u0111\u1ec3 ch\u1ecdn ra \u0111\u01a1n v\u1ecb m\u1eabu \u0111\u01b0\u1ee3c t\u00ednh l\u00e0:<\/p>\n<p>d = N \/ n (trong \u0111\u00f3: N l\u00e0 s\u1ed1 \u0111\u01a1n v\u1ecb t\u1ed5ng th\u1ec3 chung, n l\u00e0 s\u1ed1 \u0111\u01a1n v\u1ecb c\u1ee7a t\u1ed5ng th\u1ec3 m\u1eabu).<\/p>\n<p>V\u00ed d\u1ee5: Ch\u1eb3ng h\u1ea1n ch\u00fang ta ti\u1ebfn h\u00e0nh ch\u1ecdn ra 293 doanh nghi\u1ec7p trong m\u1ed9t \u0111\u1ecba ph\u01b0\u01a1ng c\u00f3 3000 doanh nghi\u1ec7p, theo ph\u01b0\u01a1ng ph\u00e1p ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng, vi\u1ec7c \u0111\u1ea7u ti\u00ean ch\u00fang ta s\u1ebd t\u00ednh kho\u1ea3ng c\u00e1ch d.<\/p>\n<p>d = N \/ n = 3000 \/ 293 = 10,23<\/p>\n<p>Ch\u00fang ta s\u1ebd l\u00e0m tr\u00f2n xu\u1ed1ng, kho\u1ea3ng c\u00e1ch ch\u1ecdn \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh d = 10.<\/p>\n<p>Ti\u1ebfp theo, ch\u00fang ta s\u1eafp x\u1ebfp danh s\u00e1ch c\u00e1c doanh nghi\u1ec7p n\u00e0y theo ti\u00eau th\u1ee9c n\u00e0o \u0111\u00f3 (ch\u1eb3ng h\u1ea1n theo t\u00ean doanh nghi\u1ec7p hay theo ph\u01b0\u01a1ng h\u01b0\u1edbng,&#8230;).<\/p>\n<p>Trong nh\u00f3m 10 doanh nghi\u1ec7p \u0111\u1ea7u ti\u00ean s\u1ebd l\u1ea5y ng\u1eabu nhi\u00ean m\u1ed9t doanh nghi\u1ec7p n\u00e0o \u0111\u00f3, (ch\u1eb3ng h\u1ea1n l\u1ea5y \u0111\u01b0\u1ee3c doanh nghi\u1ec7p th\u1ee9 6, ti\u1ebfn h\u00e0nh ch\u1ecdn c\u00e1c doanh nghi\u1ec7p ti\u1ebfp theo l\u00e0 doanh nghi\u1ec7p th\u1ee9 16, 26, 36, 46,&#8230; cho \u0111\u1ebfn khi l\u1ea5y \u0111\u1ee7 293 doanh nghi\u1ec7p).<\/p>\n<p><b>\u01afu, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng<\/b><\/p>\n<p>Ph\u01b0\u01a1ng ph\u00e1p ch\u1ecdn m\u1eabu n\u00e0y c\u00f3 th\u1ee7 t\u1ee5c \u0111\u01a1n gi\u1ea3n, r\u00fat ng\u1eafn \u0111\u01b0\u1ee3c th\u1eddi gian c\u0169ng nh\u01b0 chi ph\u00ed, khi c\u00e1c \u0111\u01a1n v\u1ecb r\u1ea3i \u0111\u1ec1u ra trong to\u00e0n b\u1ed9 t\u1ed5ng th\u1ec3 th\u00ec t\u00ednh ch\u1ea5t \u0111\u1ea1i bi\u1ec3u c\u1ee7a m\u1eabu cao. Nh\u01b0ng ng\u01b0\u1ee3c l\u1ea1i c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng x\u1ea3y ra sai s\u1ed1 h\u1ec7 th\u1ed1ng, l\u00e0 sai s\u1ed1 lu\u00f4n l\u1ec7ch v\u1ec1 m\u1ed9t ph\u00eda \u0111\u1ed1i v\u1edbi tr\u1ecb s\u1ed1 th\u1ef1c t\u1ebf, th\u1ea5p h\u01a1n ho\u1eb7c cao h\u01a1n so v\u1edbi gi\u00e1 tr\u1ecb \u0111\u00f3.\u00a0<\/p>\n<p>(Theo<i> Gi\u00e1o tr\u00ecnh Th\u1ed1ng k\u00ea doanh nghi\u1ec7p, NXB \u0110\u1ea1i h\u1ecdc Kinh t\u1ebf qu\u1ed1c d\u00e2n<\/i>)<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<div class=\"vnbcbc-sapo\" data-role=\"sapo\">\n                            Ch\u1ecdn m\u1eabu ng\u1eabu nhi\u00ean h\u1ec7 th\u1ed1ng (ti\u1ebfng Anh: Systematic Sampling) l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ch\u1ecdn m\u1eabu m\u00e0 m\u1ed7i \u0111\u01a1n v\u1ecb m\u1eabu \u0111\u01b0\u1ee3c ch\u1ecdn c\u0103n c\u1ee9 v\u00e0o t\u1eebng kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh t\u1eeb danh s\u00e1ch \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp s\u1eb5n c\u1ee7a t\u1ed5ng th\u1ec3 chung.\n                        <\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[414],"tags":[],"_links":{"self":[{"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/posts\/25996"}],"collection":[{"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/comments?post=25996"}],"version-history":[{"count":0,"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/posts\/25996\/revisions"}],"wp:attachment":[{"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/media?parent=25996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/categories?post=25996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/masterskills.org\/blog\/wp-json\/wp\/v2\/tags?post=25996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}