{"id":478625,"date":"2023-08-09T09:36:01","date_gmt":"2023-08-09T09:36:01","guid":{"rendered":""},"modified":"2023-09-05T11:17:16","modified_gmt":"2023-09-05T11:17:16","slug":"random-sample","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/random-sample\/","title":{"rendered":"M\u1eabu th\u1eed ng\u1eabu nhi\u00ean"},"content":{"rendered":"<h2>Gi\u1edbi thi\u1ec7u v\u1ec1 m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1ed1ng k\u00ea, nghi\u00ean c\u1ee9u v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u. N\u00f3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn m\u1ed9t t\u1eadp h\u1ee3p con c\u00e1c c\u00e1 th\u1ec3 ho\u1eb7c c\u00e1 th\u1ec3 t\u1eeb m\u1ed9t qu\u1ea7n th\u1ec3 l\u1edbn h\u01a1n theo c\u00e1ch m\u00e0 m\u1ecdi t\u1eadp h\u1ee3p con c\u00f3 th\u1ec3 c\u00f3 \u0111\u1ec1u c\u00f3 x\u00e1c su\u1ea5t \u0111\u01b0\u1ee3c ch\u1ecdn nh\u01b0 nhau. Qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn kh\u00f4ng thi\u00ean v\u1ecb n\u00e0y l\u00e0m cho vi\u1ec7c l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1eabu \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0 \u0111\u1ea1i di\u1ec7n cho to\u00e0n b\u1ed9 d\u00e2n s\u1ed1.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>Kh\u00e1i ni\u1ec7m l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean c\u00f3 t\u1eeb th\u1eddi c\u1ed5 \u0111\u1ea1i, khi c\u00e1c n\u1ec1n v\u0103n minh s\u01a1 khai c\u1ed1 g\u1eafng thu th\u1eadp th\u00f4ng tin \u0111\u1ea1i di\u1ec7n t\u1eeb c\u00e1c nh\u00f3m l\u1edbn h\u01a1n. Tuy nhi\u00ean, vi\u1ec7c ch\u00ednh th\u1ee9c h\u00f3a v\u00e0 hi\u1ec3u bi\u1ebft to\u00e1n h\u1ecdc v\u1ec1 l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean b\u1eaft \u0111\u1ea7u h\u00ecnh th\u00e0nh v\u00e0o th\u1ebf k\u1ef7 19. Nh\u00e0 to\u00e1n h\u1ecdc n\u1ed5i ti\u1ebfng Karl Pearson \u0111\u00e3 \u0111\u01b0a ra kh\u00e1i ni\u1ec7m l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean nh\u01b0 m\u1ed9t nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n trong th\u1ed1ng k\u00ea. Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean l\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb c\u00f4ng tr\u00ecnh c\u00f3 \u1ea3nh h\u01b0\u1edfng c\u1ee7a Pearson v\u1ec1 ph\u00e2n ph\u1ed1i chu\u1ea9n v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nghi\u00ean c\u1ee9u kh\u1ea3o s\u00e1t, th\u1eed nghi\u1ec7m v\u00e0 th\u0103m d\u00f2 \u00fd ki\u1ebfn. N\u00f3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn c\u00e1c c\u00e1 nh\u00e2n, v\u1eadt ph\u1ea9m ho\u1eb7c \u0111i\u1ec3m d\u1eef li\u1ec7u t\u1eeb m\u1ed9t qu\u1ea7n th\u1ec3 c\u00f3 x\u00e1c su\u1ea5t b\u1eb1ng nhau, \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1eabu kh\u00f4ng b\u1ecb sai l\u1ec7ch v\u00e0 ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a to\u00e0n b\u1ed9 nh\u00f3m. Qu\u00e1 tr\u00ecnh n\u00e0y gi\u1ea3m thi\u1ec3u kh\u1ea3 n\u0103ng x\u1ea3y ra l\u1ed7i l\u1ea5y m\u1eabu v\u00e0 cho ph\u00e9p c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u01b0a ra nh\u1eefng suy lu\u1eadn h\u1ee3p l\u1ec7 v\u1ec1 t\u1ed5ng th\u1ec3 d\u1ef1a tr\u00ean c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a m\u1eabu.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>V\u1ec1 c\u1ed1t l\u00f5i, vi\u1ec7c l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean c\u00e1c nguy\u00ean t\u1eafc c\u1ee7a l\u00fd thuy\u1ebft x\u00e1c su\u1ea5t. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m vi\u1ec7c s\u1eed d\u1ee5ng c\u01a1 ch\u1ebf ng\u1eabu nhi\u00ean h\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed7i ph\u1ea7n t\u1eed trong t\u1ed5ng th\u1ec3 \u0111\u1ec1u c\u00f3 c\u01a1 h\u1ed9i \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u1eabu nh\u01b0 nhau. C\u01a1 ch\u1ebf n\u00e0y c\u00f3 th\u1ec3 bao g\u1ed3m t\u1eeb l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean \u0111\u01a1n gi\u1ea3n, trong \u0111\u00f3 m\u1ed7i m\u1ee5c \u0111\u01b0\u1ee3c ch\u1ecdn v\u1edbi c\u00f9ng x\u00e1c su\u1ea5t, \u0111\u1ebfn c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u1ee9c t\u1ea1p h\u01a1n nh\u01b0 l\u1ea5y m\u1eabu ph\u00e2n t\u1ea7ng v\u00e0 l\u1ea5y m\u1eabu c\u1ee5m, bao g\u1ed3m vi\u1ec7c chia t\u1ed5ng th\u1ec3 th\u00e0nh c\u00e1c nh\u00f3m nh\u1ecf tr\u01b0\u1edbc khi ch\u1ecdn m\u1eabu.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean bao g\u1ed3m t\u00ednh ch\u1ea5t kh\u00f4ng thi\u00ean v\u1ecb, gi\u00fap ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i h\u1ec7 th\u1ed1ng trong qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn. Ngo\u00e0i ra, l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean cho ph\u00e9p \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 th\u1eed nghi\u1ec7m th\u1ed1ng k\u00ea d\u1ef1a tr\u00ean gi\u1ea3 \u0111\u1ecbnh v\u1ec1 \u0111\u1ed9 bi\u1ebfn thi\u00ean ng\u1eabu nhi\u00ean trong m\u1eabu. K\u1ef9 thu\u1eadt n\u00e0y c\u0169ng cho ph\u00e9p c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u kh\u00e1i qu\u00e1t h\u00f3a c\u00e1c ph\u00e1t hi\u1ec7n t\u1eeb m\u1eabu cho qu\u1ea7n th\u1ec3 l\u1edbn h\u01a1n v\u1edbi m\u1ee9c \u0111\u1ed9 tin c\u1eady \u0111\u00e3 bi\u1ebft.<\/p>\n<h2>C\u00e1c lo\u1ea1i m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u h\u00ecnh th\u1ee9c kh\u00e1c nhau, m\u1ed7i h\u00ecnh th\u1ee9c ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c nhau:<\/p>\n<ol>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean \u0111\u01a1n gi\u1ea3n:<\/strong> M\u1ed7i ph\u1ea7n t\u1eed trong t\u1ed5ng th\u1ec3 \u0111\u1ec1u c\u00f3 x\u00e1c su\u1ea5t \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ed9c l\u1eadp nh\u01b0 nhau.<\/li>\n<li><strong>L\u1ea5y m\u1eabu ph\u00e2n t\u1ea7ng:<\/strong> D\u00e2n s\u1ed1 \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c nh\u00f3m nh\u1ecf (t\u1ea7ng) v\u00e0 c\u00e1c m\u1eabu \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb m\u1ed7i t\u1ea7ng theo t\u1ef7 l\u1ec7.<\/li>\n<li><strong>L\u1ea5y m\u1eabu c\u1ee5m:<\/strong> D\u00e2n s\u1ed1 \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c c\u1ee5m v\u00e0 vi\u1ec7c l\u1ef1a ch\u1ecdn ng\u1eabu nhi\u00ean c\u00e1c c\u1ee5m \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu ho\u00e0n to\u00e0n.<\/li>\n<li><strong>L\u1ea5y m\u1eabu h\u1ec7 th\u1ed1ng:<\/strong> C\u00e1c m\u1ee5c \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec1u \u0111\u1eb7n t\u1eeb danh s\u00e1ch \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp c\u1ee7a t\u1ed5ng th\u1ec3.<\/li>\n<li><strong>L\u1ea5y m\u1eabu nhi\u1ec1u giai \u0111o\u1ea1n:<\/strong> K\u1ebft h\u1ee3p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu kh\u00e1c nhau trong nhi\u1ec1u giai \u0111o\u1ea1n cho c\u00e1c c\u1ea5u tr\u00fac d\u00e2n s\u1ed1 ph\u1ee9c t\u1ea1p h\u01a1n.<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i l\u1ea5y m\u1eabu<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ng\u1eabu nhi\u00ean \u0111\u01a1n gi\u1ea3n<\/td>\n<td>C\u01a1 h\u1ed9i b\u00ecnh \u0111\u1eb3ng cho m\u1ed7i m\u1ee5c \u0111\u01b0\u1ee3c ch\u1ecdn.<\/td>\n<\/tr>\n<tr>\n<td>L\u1ea5y m\u1eabu ph\u00e2n t\u1ea7ng<\/td>\n<td>\u0110\u1ea3m b\u1ea3o s\u1ef1 \u0111\u1ea1i di\u1ec7n t\u1eeb c\u00e1c nh\u00f3m con kh\u00e1c nhau.<\/td>\n<\/tr>\n<tr>\n<td>L\u1ea5y m\u1eabu c\u1ee5m<\/td>\n<td>H\u1eefu \u00edch cho c\u00e1c nh\u00f3m d\u00e2n c\u01b0 ph\u00e2n t\u00e1n v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00fd.<\/td>\n<\/tr>\n<tr>\n<td>L\u1ea5y m\u1eabu h\u1ec7 th\u1ed1ng<\/td>\n<td>Qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn c\u00f3 h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1ch \u0111\u1ec1u nhau.<\/td>\n<\/tr>\n<tr>\n<td>L\u1ea5y m\u1eabu nhi\u1ec1u giai \u0111o\u1ea1n<\/td>\n<td>\u00c1p d\u1ee5ng cho c\u00e1c c\u1ea5u tr\u00fac d\u00e2n s\u1ed1 ph\u1ee9c t\u1ea1p, k\u1ebft h\u1ee3p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu kh\u00e1c nhau.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng m\u1eabu ng\u1eabu nhi\u00ean, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean t\u00ecm th\u1ea5y \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c nh\u01b0 nghi\u00ean c\u1ee9u th\u1ecb tr\u01b0\u1eddng, th\u0103m d\u00f2 d\u01b0 lu\u1eadn, ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 nghi\u00ean c\u1ee9u khoa h\u1ecdc. Tuy nhi\u00ean, nh\u1eefng th\u00e1ch th\u1ee9c c\u00f3 th\u1ec3 n\u1ea3y sinh, bao g\u1ed3m c\u1ea3 th\u00e0nh ki\u1ebfn kh\u00f4ng ph\u1ea3n h\u1ed3i, khi c\u00e1c c\u00e1 nh\u00e2n \u0111\u01b0\u1ee3c ch\u1ecdn t\u1eeb ch\u1ed1i tham gia. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng v\u1ea5n \u0111\u1ec1 nh\u01b0 v\u1eady, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 l\u1ea5y m\u1eabu qu\u00e1 m\u1ee9c, l\u1ea5y tr\u1ecdng s\u1ed1 v\u00e0 quy \u0111\u1ed5i \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u00e1c sai l\u1ec7ch v\u00e0 \u0111i\u1ec3m kh\u00f4ng ch\u00ednh x\u00e1c ti\u1ec1m \u1ea9n trong d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp.<\/p>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u0111\u1eb7c tr\u01b0ng<\/th>\n<th>M\u1eabu th\u1eed ng\u1eabu nhi\u00ean<\/th>\n<th>M\u1eabu thu\u1eadn ti\u1ec7n<\/th>\n<th>L\u1ea5y m\u1eabu ph\u00e2n t\u1ea7ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ph\u00f2ng ch\u1ed1ng thi\u00ean v\u1ecb<\/td>\n<td>Qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn kh\u00e1ch quan<\/td>\n<td>D\u1ec5 b\u1ecb sai l\u1ec7ch l\u1ef1a ch\u1ecdn<\/td>\n<td>Gi\u1ea3m s\u1ef1 thi\u00ean v\u1ecb th\u00f4ng qua c\u00e1c nh\u00f3m con<\/td>\n<\/tr>\n<tr>\n<td>T\u00ednh \u0111\u1ea1i di\u1ec7n<\/td>\n<td>Cao, khi \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh \u0111\u00fang c\u00e1ch<\/td>\n<td>\u0110\u1ea1i di\u1ec7n h\u1ea1n ch\u1ebf<\/td>\n<td>T\u00ednh \u0111\u1ea1i di\u1ec7n cao trong c\u00e1c t\u1ea7ng l\u1edbp<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/td>\n<td>C\u00f3 s\u1eb5n c\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p<\/td>\n<td>\u0110\u01a1n gi\u1ea3n<\/td>\n<td>\u0110\u1ed9 ph\u1ee9c t\u1ea1p v\u1eeba ph\u1ea3i, ph\u00e2n nh\u00f3m<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng suy lu\u1eadn<\/td>\n<td>Th\u00edch h\u1ee3p cho suy lu\u1eadn th\u1ed1ng k\u00ea<\/td>\n<td>Gi\u1edbi h\u1ea1n cho vi\u1ec7c kh\u00e1i qu\u00e1t h\u00f3a<\/td>\n<td>Th\u00edch h\u1ee3p cho c\u00e1c suy lu\u1eadn nh\u00f3m con ch\u00ednh x\u00e1c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, k\u1ef9 thu\u1eadt l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean c\u00f3 th\u1ec3 tr\u1edf n\u00ean hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n. Nh\u1eefng \u0111\u1ed5i m\u1edbi trong vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u, bao g\u1ed3m kh\u1ea3o s\u00e1t tr\u1ef1c tuy\u1ebfn v\u00e0 ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu t\u1ef1 \u0111\u1ed9ng, s\u1ebd cho ph\u00e9p c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u ti\u1ebfn h\u00e0nh c\u00e1c nghi\u00ean c\u1ee9u l\u1edbn h\u01a1n v\u00e0 \u0111a d\u1ea1ng h\u01a1n. Ngo\u00e0i ra, vi\u1ec7c t\u00edch h\u1ee3p m\u00e1y h\u1ecdc v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o c\u00f3 th\u1ec3 n\u00e2ng cao qu\u00e1 tr\u00ecnh l\u1ef1a ch\u1ecdn b\u1eb1ng c\u00e1ch t\u1ed1i \u01b0u h\u00f3a c\u00e1c chi\u1ebfn l\u01b0\u1ee3c l\u1ea5y m\u1eabu d\u1ef1a tr\u00ean c\u00e1c ti\u00eau ch\u00ed kh\u00e1c nhau.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 m\u1eabu ng\u1eabu nhi\u00ean<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh thu th\u1eadp d\u1eef li\u1ec7u, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean. M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 cung c\u1ea5p cho c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00e1ch truy c\u1eadp d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u v\u1ecb tr\u00ed v\u00e0 m\u1ea1ng kh\u00e1c nhau, cho ph\u00e9p l\u1ea5y m\u1eabu r\u1ed9ng h\u01a1n v\u00e0 mang t\u00ednh \u0111\u1ea1i di\u1ec7n h\u01a1n. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00f3 th\u1ec3 m\u00f4 ph\u1ecfng c\u00e1c h\u00e0nh vi v\u00e0 nh\u00e2n kh\u1ea9u h\u1ecdc kh\u00e1c nhau c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, n\u00e2ng cao t\u00ednh \u0111a d\u1ea1ng v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Random_sampling\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia \u2013 L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean<\/a><\/li>\n<li><a href=\"https:\/\/www.surveymonkey.com\/curiosity\/introduction-to-random-sampling\/\" target=\"_new\" rel=\"noopener nofollow\">SurveyMonkey \u2013 Gi\u1edbi thi\u1ec7u v\u1ec1 L\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean<\/a><\/li>\n<li><a href=\"https:\/\/www.investopedia.com\/terms\/r\/random-sample.asp\" target=\"_new\" rel=\"noopener nofollow\">Investopedia \u2013 \u0110\u1ecbnh ngh\u0129a m\u1eabu ng\u1eabu nhi\u00ean<\/a><\/li>\n<\/ul>\n<p>T\u00f3m l\u1ea1i, l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt n\u1ec1n t\u1ea3ng trong th\u1ed1ng k\u00ea nh\u1eb1m \u0111\u1ea3m b\u1ea3o vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u kh\u00f4ng thi\u00ean v\u1ecb v\u00e0 mang t\u00ednh \u0111\u1ea1i di\u1ec7n. C\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 tr\u1ea3i r\u1ed9ng tr\u00ean nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a n\u00f3 g\u1eafn li\u1ec1n v\u1edbi nh\u1eefng ti\u1ebfn b\u1ed9 c\u00f4ng ngh\u1ec7. Khi c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u ti\u1ebfp t\u1ee5c c\u1ea3i ti\u1ebfn v\u00e0 \u0111\u1ed5i m\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu, t\u00ednh ch\u00ednh x\u00e1c v\u00e0 ti\u1ec7n \u00edch c\u1ee7a vi\u1ec7c l\u1ea5y m\u1eabu ng\u1eabu nhi\u00ean ch\u1eafc ch\u1eafn s\u1ebd v\u1eabn l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t trong vi\u1ec7c \u0111\u1ecbnh h\u00ecnh s\u1ef1 hi\u1ec3u bi\u1ebft c\u1ee7a ch\u00fang ta v\u1ec1 qu\u1ea7n th\u1ec3 v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng.<\/p>","protected":false},"featured_media":469311,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478625","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Random Sample: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is random sampling?","answer":"<p>Random sampling is a statistical technique used to select a subset of individuals or items from a larger population in a way that ensures every possible subset has an equal chance of being chosen. This method prevents bias and allows researchers to make accurate inferences about the entire population based on the characteristics of the sample.<\/p>"},{"question":"How does random sampling originate and where was it first mentioned?","answer":"<p>The concept of random sampling dates back to ancient civilizations, but its formalization and mathematical understanding began in the 19th century. The mathematician Karl Pearson introduced the concept, with its first mention found in his work on the normal distribution and its applications.<\/p>"},{"question":"What is the importance of random sampling in research and data analysis?","answer":"<p>Random sampling ensures that the selected sample is representative of the entire population, reducing the potential for errors in research. This technique enables valid inferences, statistical tests, and generalizations from the sample to the larger population.<\/p>"},{"question":"What are the different types of random sampling?","answer":"<p>There are several types of random sampling:<\/p><ul><li><strong>Simple Random Sampling:<\/strong> Each item is chosen with an equal chance.<\/li><li><strong>Stratified Sampling:<\/strong> The population is divided into subgroups, and samples are taken from each subgroup.<\/li><li><strong>Cluster Sampling:<\/strong> The population is divided into clusters, and entire clusters are sampled.<\/li><li><strong>Systematic Sampling:<\/strong> Items are selected at regular intervals from a sorted list.<\/li><li><strong>Multi-Stage Sampling:<\/strong> Combines different sampling methods for complex populations.<\/li><\/ul>"},{"question":"What challenges can arise with random sampling?","answer":"<p>Challenges include non-response bias when selected individuals refuse to participate. Solutions like oversampling, weighting, and imputation can be used to address biases and inaccuracies.<\/p>"},{"question":"How does random sampling relate to proxy servers?","answer":"<p>Proxy servers are often used alongside random sampling for data collection. They allow researchers to access data from various locations and networks, enhancing the diversity and accuracy of the collected data.<\/p>"},{"question":"What does the future hold for random sampling and technology?","answer":"<p>As technology advances, random sampling techniques are likely to become more efficient and effective. Innovations in data collection, like online surveys and AI-based methods, will play a role in optimizing sampling strategies.<\/p>"},{"question":"Where can I find more information about random sampling?","answer":"<p>For more insights, you can explore the following resources:<\/p><ul><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Random_sampling\" target=\"_new\">Wikipedia - Random Sampling<\/a><\/li><li><a href=\"https:\/\/www.surveymonkey.com\/curiosity\/introduction-to-random-sampling\/\" target=\"_new\">SurveyMonkey - Introduction to Random Sampling<\/a><\/li><li><a href=\"https:\/\/www.investopedia.com\/terms\/r\/random-sample.asp\" target=\"_new\">Investopedia - Random Sample Definition<\/a><\/li><\/ul>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478625","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478625\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/469311"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}