{"id":5025,"date":"2026-10-12T08:00:00","date_gmt":"2026-10-12T01:00:00","guid":{"rendered":"https:\/\/dykhoa.com\/blog\/?post_type=thuat_ngu&#038;p=5024"},"modified":"2026-10-14T07:50:13","modified_gmt":"2026-10-14T00:50:13","slug":"thien-lech-cong-bo-publication-bias","status":"publish","type":"thuat_ngu","link":"https:\/\/dykhoa.com\/blog\/thuat-ngu\/thien-lech-cong-bo-publication-bias\/","title":{"rendered":"Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 (publication bias) l\u00e0 g\u00ec?"},"content":{"rendered":"<h2>Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 l\u00e0 g\u00ec?<\/h2>\n<p>Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 (publication bias, c\u00f2n g\u1ecdi l\u00e0 v\u1ea5n \u0111\u1ec1 ng\u0103n k\u00e9o h\u1ed3 s\u01a1, file drawer problem) n\u1ea3y sinh khi nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 hay kh\u00f4ng t\u00f9y thu\u1ed9c v\u00e0o k\u1ebft qu\u1ea3. T\u1ed5ng quan h\u1ec7 th\u1ed1ng c\u1ee7a Dwan v\u00e0 cs. (2008) cho th\u1ea5y k\u1ebft qu\u1ea3 c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o \u0111\u1ea7y \u0111\u1ee7 cao h\u01a1n k\u1ebft qu\u1ea3 kh\u00f4ng c\u00f3 \u00fd ngh\u0129a, v\u1edbi t\u1ef7 s\u1ed1 ch\u00eanh t\u1eeb 2,2 \u0111\u1ebfn 4,7; nghi\u00ean c\u1ee9u kh\u00f4ng c\u00f3 k\u1ebft qu\u1ea3 c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea c\u0169ng m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n m\u1edbi \u0111\u01b0\u1ee3c \u0111\u0103ng. \u0110\u00e1ng ch\u00fa \u00fd, nghi\u00ean c\u1ee9u kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 ch\u1ee7 y\u1ebfu v\u00ec t\u00e1c gi\u1ea3 kh\u00f4ng g\u1eedi b\u00e0i, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u00ec t\u1ea1p ch\u00ed t\u1eeb ch\u1ed1i.<\/p>\n<h2>L\u00e0m sai l\u1ec7ch t\u1ed5ng quan y khoa<\/h2>\n<p>Khi c\u00e1c b\u00e0i ph\u00e2n t\u00edch g\u1ed9p (meta-analysis) ch\u1ec9 thu th\u1eadp \u0111\u01b0\u1ee3c c\u00e1c b\u00e0i b\u00e1o \u0111\u00e3 c\u00f4ng b\u1ed1, thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 d\u1eabn \u0111\u1ebfn \u01b0\u1edbc t\u00ednh qu\u00e1 cao hi\u1ec7u qu\u1ea3 \u0111i\u1ec1u tr\u1ecb (Dwan v\u00e0 cs., 2008). M\u1ed9t d\u1ea1ng g\u1ea7n v\u1edbi n\u00f3 l\u00e0 thi\u00ean l\u1ec7ch b\u00e1o c\u00e1o k\u1ebft c\u1ee5c (outcome reporting bias): khi so b\u00e0i b\u00e1o v\u1edbi \u0111\u1ec1 c\u01b0\u01a1ng, 40% \u0111\u1ebfn 62% nghi\u00ean c\u1ee9u c\u00f3 \u00edt nh\u1ea5t m\u1ed9t k\u1ebft c\u1ee5c ch\u00ednh b\u1ecb thay \u0111\u1ed5i, th\u00eam v\u00e0o ho\u1eb7c b\u1ecf \u0111i.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 (publication bias) l\u00e0 g\u00ec? V\u00ec sao k\u1ebft qu\u1ea3 \u00e2m t\u00ednh hay b\u1ecb b\u1ecf ng\u0103n k\u00e9o v\u00e0 \u0111i\u1ec1u \u0111\u00f3 l\u00e0m ph\u00e2n t\u00edch g\u1ed9p ph\u00f3ng \u0111\u1ea1i hi\u1ec7u qu\u1ea3 \u0111i\u1ec1u tr\u1ecb.<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","nhom_thuat_ngu":[476],"class_list":["post-5025","thuat_ngu","type-thuat_ngu","status-publish","hentry","nhom_thuat_ngu-nghien-cuu-bang-chung"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 (publication bias) l\u00e0 g\u00ec? - Dy Khoa Blog<\/title>\n<meta name=\"description\" content=\"Thi\u00ean l\u1ec7ch c\u00f4ng b\u1ed1 (publication bias) l\u00e0 g\u00ec? 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