{"id":5028,"date":"2026-10-12T08:00:00","date_gmt":"2026-10-12T01:00:00","guid":{"rendered":"https:\/\/dykhoa.com\/blog\/?post_type=thuat_ngu&p=5027"},"modified":"2026-10-12T08:00:00","modified_gmt":"2026-10-12T01:00:00","slug":"thien-lech-chon-mau-selection-bias","status":"publish","type":"thuat_ngu","link":"https:\/\/dykhoa.com\/blog\/thuat-ngu\/thien-lech-chon-mau-selection-bias\/","title":{"rendered":"Thi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu (selection bias) l\u00e0 g\u00ec?"},"content":{"rendered":"

Thi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu l\u00e0 g\u00ec?<\/h2>\n

Thi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu (selection bias) l\u00e0m sai l\u1ec7ch m\u1ed1i quan h\u1ec7 gi\u1eefa y\u1ebfu t\u1ed1 ph\u01a1i nhi\u1ec5m v\u00e0 k\u1ebft qu\u1ea3 b\u1ec7nh t\u1eadt ngay t\u1eeb kh\u00e2u tuy\u1ec3n ch\u1ecdn t\u00ecnh nguy\u1ec7n vi\u00ean ho\u1eb7c do t\u00ecnh tr\u1ea1ng m\u1ea5t d\u1ea5u theo d\u00f5i ng\u01b0\u1eddi b\u1ec7nh (loss to follow-up) (Heckman, 1979; Hern\u00e1n et al., 2004).<\/p>\n

C\u1ea3nh gi\u00e1c v\u1edbi c\u00e1c kh\u1ea3o s\u00e1t tr\u1ef1c tuy\u1ebfn t\u1ef1 nguy\u1ec7n<\/h2>\n

M\u1ed9t cu\u1ed9c th\u0103m d\u00f2 \u00fd ki\u1ebfn tr\u00ean m\u1ea1ng ch\u1ec9 thu h\u00fat nh\u1eefng ng\u01b0\u1eddi c\u00f3 \u0111\u1ecbnh ki\u1ebfn c\u1ef1c \u0111oan ho\u1eb7c quan t\u00e2m \u0111\u1eb7c bi\u1ec7t tham gia, do \u0111\u00f3 k\u1ebft qu\u1ea3 ho\u00e0n to\u00e0n v\u00f4 gi\u00e1 tr\u1ecb v\u1ec1 m\u1eb7t \u0111\u1ea1i di\u1ec7n cho ti\u1ebfng n\u00f3i c\u1ee7a to\u00e0n x\u00e3 h\u1ed9i.<\/p>\n","protected":false},"excerpt":{"rendered":"

Thi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu l\u00e0 sai s\u1ed1 h\u1ec7 th\u1ed1ng x\u1ea3y ra khi c\u00e1c c\u00e1 nh\u00e2n \u0111\u01b0\u1ee3c ch\u1ecdn v\u00e0o nghi\u00ean c\u1ee9u kh\u00f4ng mang t\u00ednh \u0111\u1ea1i di\u1ec7n c\u00f4ng b\u1eb1ng cho to\u00e0n b\u1ed9 qu\u1ea7n th\u1ec3 m\u1ee5c ti\u00eau c\u1ea7n kh\u1ea3o s\u00e1t.<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","nhom_thuat_ngu":[476],"class_list":["post-5028","thuat_ngu","type-thuat_ngu","status-publish","hentry","nhom_thuat_ngu-nghien-cuu-bang-chung"],"yoast_head":"\nThi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu (selection bias) l\u00e0 g\u00ec? - Dy Khoa Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dykhoa.com\/blog\/thuat-ngu\/thien-lech-chon-mau-selection-bias\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thi\u00ean l\u1ec7ch ch\u1ecdn m\u1eabu (selection bias) l\u00e0 g\u00ec? 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