{"id":620,"date":"2023-07-29T07:27:50","date_gmt":"2023-07-29T07:27:50","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3-%e1%84%89%e1%85%a1%e1%86%bc%e1%84%90%e1%85%a2\/"},"modified":"2023-07-29T07:27:50","modified_gmt":"2023-07-29T07:27:50","slug":"%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3-%e1%84%89%e1%85%a1%e1%86%bc%e1%84%90%e1%85%a2","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%8b%e1%85%b0%e1%86%af%e1%84%8e%e1%85%b5%e1%84%89%e1%85%b3-t-%e1%84%90%e1%85%a6%e1%84%89%e1%85%b3%e1%84%90%e1%85%b3-%e1%84%89%e1%85%a1%e1%86%bc%e1%84%90%e1%85%a2\/","title":{"rendered":"Stata\uc5d0\uc11c welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"

<\/p>\n

\n

\ub450 \ub3c5\ub9bd \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub294 \uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \ubc29\ubc95\uc740 2-\ud45c\ubcf8 t-\uac80\uc815\uc744<\/a> \uc0ac\uc6a9\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc774 \uac80\uc815\uc5d0\uc11c\ub294 \ub450 \uadf8\ub8f9 \uac04\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n

\ub450 \uadf8\ub8f9 \uac04\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c \ud558\uc9c0 \uc54a\ub2e4\uace0<\/em> \uc0dd\uac01\ub418\uba74 2-\ud45c\ubcf8 t-\uac80\uc815\uc5d0 \ud574\ub2f9\ud558\ub294 \ube44\ubaa8\uc218\uc801 \ubc29\ubc95\uc778 Welch\uc758 t-\uac80\uc815\uc744<\/a> \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

\uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 Stata\uc5d0\uc11c Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/span><\/p>\n

\uc608: Stata\uc758 Welch’s t-test<\/strong><\/span><\/h2>\n

\uc774 \uc608\uc5d0\uc11c\ub294 \ud2b9\uc815 \uc5f0\ub8cc \ucc98\ub9ac\ub97c \ubc1b\uc740 \uc790\ub3d9\ucc28 12\ub300\uc640 \uadf8\ub807\uc9c0 \uc54a\uc740 \uc790\ub3d9\ucc28 12\ub300\uc758 mpg\uac00 \ud3ec\ud568\ub41c Fuel3<\/em> \ub370\uc774\ud130\uc138\ud2b8\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/span><\/p>\n

Welch’t T-test\ub97c \uc218\ud589\ud558\uc5ec \ub450 \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0 mpg\uc5d0 \ucc28\uc774\uac00 \uc788\ub294\uc9c0 \ud655\uc778\ud558\ub824\uba74 \ub2e4\uc74c \ub2e8\uacc4\ub97c \ub530\ub974\uc138\uc694.<\/span><\/p>\n

1\ub2e8\uacc4: \ub370\uc774\ud130\ub97c \ub85c\ub4dc\ud558\uace0 \ud45c\uc2dc\ud569\ub2c8\ub2e4.<\/strong><\/span><\/p>\n

\uba3c\uc800 \uba85\ub839 \uc0c1\uc790\uc5d0 \ub2e4\uc74c \uba85\ub839\uc744 \uc785\ub825\ud558\uc5ec \ub370\uc774\ud130\uc138\ud2b8\ub97c \ub85c\ub4dc\ud569\ub2c8\ub2e4.<\/span><\/p>\n

\n

https:\/\/www.stata-press.com\/data\/r13\/fuel3\uc744 \uc0ac\uc6a9\ud558\uc138\uc694.<\/strong><\/span><\/p>\n<\/blockquote>\n

\ub2e4\uc74c \uba85\ub839\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc6d0\uc2dc \ub370\uc774\ud130\ub97c \ubd05\ub2c8\ub2e4.<\/span><\/p>\n

\n

\ubaa9\ub85d<\/span><\/strong> <\/p>\n<\/blockquote>\n

\"Stata\uc758<\/p>\n

2\ub2e8\uacc4: \ub370\uc774\ud130\ub97c \uc2dc\uac01\ud654\ud569\ub2c8\ub2e4.<\/strong><\/span><\/p>\n

Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\uae30 \uc804\uc5d0 \uba3c\uc800 \uac01 \uadf8\ub8f9\uc758 mpg \ubd84\ud3ec\ub97c \uc2dc\uac01\ud654\ud558\uae30 \uc704\ud574 \ub450 \uac1c\uc758 \uc0c1\uc790 \uadf8\ub9bc\uc744<\/a> \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

\n

mpg \uadf8\ub798\ud53d \uc0c1\uc790, \uc774\uc0c1(\ucc98\ub9ac\ub428)<\/strong><\/span> <\/p>\n<\/blockquote>\n

\"Stata\uc758<\/p>\n

\uadf8\ub8f9 1(\uc5f0\ub8cc \ucc98\ub9ac\ub97c \ubc1b\uc740 \uadf8\ub8f9)\uc758 mpg\uac00 \uadf8\ub8f9 0\ubcf4\ub2e4 \ub192\uc740 \uacbd\ud5a5\uc774 \uc788\uc74c\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c \uadf8\ub8f9 1\uc758 \ubd84\uc0b0\uc774 \uadf8\ub8f9 0(\ud3ed)\ubcf4\ub2e4 \uc57d\uac04 \uc791\uc740 \uac83\ucc98\ub7fc \ubcf4\uc774\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc0c1\uc790 \ud06c\uae30\uac00 \ub354 \uc791\uc2b5\ub2c8\ub2e4).<\/span><\/p>\n

3\ub2e8\uacc4: Welch\uc758 t-\uac80\uc815 \uc218\ud589<\/strong><\/span><\/p>\n

Welch t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub824\uba74 \ub2e4\uc74c \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/span><\/p>\n

ttest \ubcc0\uc218_to_\uce21\uc815, \uc791\uc131\uc790: (grouping_variable) welch<\/span><\/strong><\/p>\n

\ud2b9\uc815 \uc608\uc758 \uad6c\ubb38\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

\n

ttest mpg, \uc791\uc131\uc790: (\ucc98\ub9ac\ub41c) Welch<\/strong><\/span> <\/p>\n<\/blockquote>\n

\"Stata\uc5d0\uc11c<\/p>\n

\uacb0\uacfc\ub97c \ud574\uc11d\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

    \n
  • \uadf8\ub8f9 0\uc758 \ud3c9\uade0 mpg\ub294 21<\/strong> \uc774\uc5c8\uc2b5\ub2c8\ub2e4. \uc2e4\uc81c \ubaa8\uc9d1\ub2e8 \ud3c9\uade0\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0 \uad6c\uac04\uc740 (19.26525, 22.73745)<\/strong> \uc600\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n
  • \uadf8\ub8f9 1\uc758 \ud3c9\uade0 mpg\ub294 22.75<\/strong> \uc600\uc2b5\ub2c8\ub2e4. \uc2e4\uc81c \ubaa8\uc9d1\ub2e8 \ud3c9\uade0\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0 \uad6c\uac04\uc740 (20.68449, 24.81551)<\/strong> \uc774\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n
  • \uadf8\ub8f9 0 \u2013 \uadf8\ub8f9 1\uc758 \ud3c9\uade0 mpg \ucc28\uc774\ub294 -1.75<\/strong> \uc600\uc2b5\ub2c8\ub2e4. \ubaa8\uc9d1\ub2e8 \ud3c9\uade0 \uac04\uc758 \uc2e4\uc81c \ucc28\uc774\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0 \uad6c\uac04\uc740 (-4.28369, 0.7836902)<\/strong> \uc600\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n
  • Welch\uc758 t-\uac80\uc815\uc5d0 \ub300\ud55c \uac80\uc815 \ud1b5\uacc4\ub7c9 t\ub294<\/em> -1.4280<\/strong> \uc774\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n
  • \uc6b0\ub9ac\ub294 \ud3c9\uade0 mpg\uac00 \ub450 \uadf8\ub8f9 \uc0ac\uc774\uc5d0 \ub2e8\uc21c\ud788 \ub2e4\ub974\ub2e4\ub294 \ub300\ub9bd \uac00\uc124\uc5d0 \uad00\uc2ec\uc774 \uc788\uae30 \ub54c\ubb38\uc5d0 Ha:diff != 0\uacfc \uad00\ub828\ub41c p-\uac12\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ub294 0.1666<\/strong> \uc73c\ub85c \ubc1d\ud600\uc84c\uc2b5\ub2c8\ub2e4. \uc774 \uac12\uc740 0.05 \uc774\uc0c1\uc774\ubbc0\ub85c \ub450 \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0 mpg\uac00 \ub2e4\ub974\ub2e4\uace0 \ub9d0\ud560 \uc218 \uc788\ub294 \ucda9\ubd84\ud55c \uc99d\uac70\uac00 \uc5c6\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n<\/ul>\n

    4\ub2e8\uacc4: \uacb0\uacfc\ub97c \ubcf4\uace0\ud569\ub2c8\ub2e4.<\/strong><\/span><\/p>\n

    \ub9c8\uc9c0\ub9c9\uc73c\ub85c Welch’s t-test\uc758 \uacb0\uacfc\ub97c \ubcf4\uace0\ud558\uace0\uc790 \ud569\ub2c8\ub2e4. \uc774\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc758 \uc608\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

    \n

    \uc5f0\ub8cc \ucc98\ub9ac\ub97c \ubc1b\uc740 \uc790\ub3d9\ucc28 \uadf8\ub8f9\uacfc \uadf8\ub807\uc9c0 \uc54a\uc740 \uc790\ub3d9\ucc28 \uadf8\ub8f9 \uc0ac\uc774\uc5d0 mpg\uc5d0 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ubbf8\ud55c \ucc28\uc774\uac00 \uc788\ub294\uc9c0 \ud655\uc778\ud558\uae30 \uc704\ud574 Welch\uc758 t-\ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud588\uc2b5\ub2c8\ub2e4. \ub450 \uadf8\ub8f9\uc758 \ud45c\ubcf8 \ud06c\uae30\ub294 \uc790\ub3d9\ucc28 12\ub300\uc600\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

    Welch\uc758 t-\uac80\uc815\uc5d0\uc11c\ub294 \ub450 \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0(t = -1.4280, p = 0.1666)\uc5d0 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud55c \ucc28\uc774\uac00 \uc5c6\ub294<\/em> \uac83\uc73c\ub85c \ub098\ud0c0\ub0ac\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

    \uadf8\ub8f9 0(\ube44\uce58\ub8cc\uad70)\uacfc \uadf8\ub8f9 1(\uce58\ub8cc\uad70) \uac04\uc758 \uc2e4\uc81c \ud3c9\uade0 \ucc28\uc774\uc5d0 \ub300\ud55c 95% \uc2e0\ub8b0\uad6c\uac04\uc740 (-4.28369, 0.7836902)\uc778 \uac83\uc73c\ub85c \ub098\ud0c0\ub0ac\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"

    \ub450 \ub3c5\ub9bd \uadf8\ub8f9 \uac04\uc758 \ud3c9\uade0\uc744 \ube44\uad50\ud558\ub294 \uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \ubc29\ubc95\uc740 2-\ud45c\ubcf8 t-\uac80\uc815\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc774 \uac80\uc815\uc5d0\uc11c\ub294 \ub450 \uadf8\ub8f9 \uac04\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c\ud558\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4. \ub450 \uadf8\ub8f9 \uac04\uc758 \ubd84\uc0b0\uc774 \ub3d9\uc77c \ud558\uc9c0 \uc54a\ub2e4\uace0 \uc0dd\uac01\ub418\uba74 2-\ud45c\ubcf8 t-\uac80\uc815\uc5d0 \ud574\ub2f9\ud558\ub294 \ube44\ubaa8\uc218\uc801 \ubc29\ubc95\uc778 Welch\uc758 t-\uac80\uc815\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 Stata\uc5d0\uc11c Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \uc608: Stata\uc758 Welch’s t-test \uc774 \uc608\uc5d0\uc11c\ub294 \ud2b9\uc815 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-620","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"\nStata\uc5d0\uc11c Welch\uc758 t-\uac80\uc815\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95 - 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