{"id":9139,"date":"2011-07-09T00:42:00","date_gmt":"2011-07-09T00:42:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=9139"},"modified":"2011-07-09T00:42:00","modified_gmt":"2011-07-09T00:42:00","slug":"%ed%8f%89%ea%b7%a0%ea%b3%bc-%eb%b6%84%ec%82%b0%ec%9d%b4-%eb%b0%94%eb%80%94-%eb%95%8c","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=9139","title":{"rendered":"\ud3c9\uade0\uacfc \ubd84\uc0b0\uc774 \ubc14\ub014 \ub54c"},"content":{"rendered":"<div class=\"desc\">\n        \ud504\ub85c\uadf8\ub7a8\uc744 \ub9cc\ub4e4\ub2e4 \ubcf4\ub2c8 \ubcc4\uac78 \ub2e4 \ud558\uac8c \ub418\ub294 \uc0c1\ud669\uc774\ub2e4. (\ub0a9\ub55c\ud558\ub2e4\uac00 \uc0ac\ud3ec\uc9c8\ud558\ub2e4\uac00 \uc65c \ud504\ub85c\uadf8\ub798\ubc0d\uc774\ub0d0\uba74, \uc6c3\uc9c0\uc694 -_-; \ub0b4 \uc77c\uc774 \uc6d0\ub798 \uadf8\ub807\ub2e4. \ubb50\ub4e0\uc9c0 \ub2e4 \ud558\ub294&#8230;)<\/p>\n<p>        \uc2e4\ud5d8 \uacb0\uacfc\ub97c \ubd84\uc11d\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc778\ub370, \ubd84\uc11d\uc740 \ubcc4\uac8c \uc544\ub2c8\ub77c \uc785\ub825\uac12\uc758 \ud3c9\uade0\uacfc \ud45c\uc900\ud3b8\ucc28(\ubd84\uc0b0\uc758 \uc81c\uacf1\uadfc)\ub97c \uacc4\uc0b0\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc774\ub2e4. \ubb38\uc81c\ub294 \uc785\ub825\uac12\uc744 \uc801\uc808\ud788 \uad6c\ubd84\ud574\uc57c \ud55c\ub2e4\ub294 \uc810\uc774\ub2e4. \uc989, \uc9c0\uae08 \uc77d\uc5b4\uc628 \uc785\ub825\uac12\uc774 \ub9c8\uc9c0\ub9c9 \uac12\uc774 \uc544\ub2d0 \uc218\ub3c4 \uc788\ub2e4\ub294 \uac83\uc774 \ubb38\uc81c\uc810\uc774\ub2e4. \uc6d0\ub798\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \ud504\ub85c\uadf8\ub7a8\uc744 \uc124\uacc4\ud574\uc57c \ud55c\ub2e4.<\/p>\n<p>        \ud56d\ubaa9\uc774 \uc5ec\ub7ec\uac1c \uc788\ub2e4. A\uc0d8\ud50c, B\uc0d8\ud50c &#8230;<br \/>\n        <br \/>\n        \uac01 \uc0d8\ud50c\ub9c8\ub2e4 \uc2e4\ud5d8 \uce21\uc815\uac12\uc774 \uc788\ub2e4. 1\ubc88, 2\ubc88, &#8230;<br \/>\n        <br \/>\n        \ub2f9\uc5f0\ud788 \uac01 \uc0d8\ud50c\ub9c8\ub2e4 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uad6c\ud574\uc57c \ud55c\ub2e4. \ubb38\uc81c\ub294 \uc0d8\ud50c\uc774 \uc21c\uc11c\ub300\ub85c \uc815\ub82c\ub418\uc5b4 \uc788\uc9c0 \uc54a\uace0 \ub4a4\uc11e\uc5ec \uc788\ub2e4\ub294 \uc810\uc774\ub2e4.<\/p>\n<p>        1. \uc0d8\ud50c\uc744 \uc21c\uc11c\ub300\ub85c \uc815\ub82c\ud55c\ub2e4.<br \/>\n        <br \/>\n        2. DB\uc5d0 \ub123\uc5b4\uc11c Group by\ub85c \ubb36\uc740 \ud6c4 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uad6c\ud55c\ub2e4.<\/p>\n<p>        \uc54c\uace0\ub9ac\uc998\uc740 \uc774\uac8c \uac00\uc7a5 \ub2e8\uc21c\ud55c\ub370 \uc2e4\uc81c \uad6c\ud604\uc740 \uc0bd\uc9c8\uc774\ub2e4. \uc65c\ub0d0\ud558\uba74 \ub09c VB.net\uc5d0\uc11c \uac1c\ubc1c\uc744 \ud558\ub824\uace0 \ud558\uace0 \uc788\uace0, \uc5ec\uae30\uc11c DB\ub97c \uc4f0\ub824\uba74 MSSQL\uc744 \uc4f0\ub4e0\uac00 \uc804\uc5d0 \uc5ec\uae30\uc11c \uc5b8\uae09\ud588\ub358 SQLite\uc758 VB \ud3ec\ud2b8\ub97c \uc4f0\ub4e0\uac00 \ud574\uc57c \ud558\ub294\ub370, \uc5b4\uca0c\uac70\ub098 SQL\uae4c\uc9c0 \ub2e4\ub8e8\ub294 \uac74 \uace8\uce58\uc544\ud508 \uc77c\uc774\ub2e4. \ub530\ub77c\uc11c \uc800 \uc815\ub82c \ubd80\ubd84\uc744 \uc9c1\uc811 \uad6c\ud604\ud574\uc57c \ud558\ub098 \ud558\ub294 \uace0\ubbfc\uc774 \ub4e4\ub2e4\uac00 \uadc0\ucc2e\uc73c\ub2c8\uae4c \uadf8\ub7ec\uc9c0 \ub9d0\uc790\uace0 \uc0dd\uac01\ud588\ub2e4.<\/p>\n<p>        1. \ub370\uc774\ud130 \ud14c\uc774\ube14\uc744 \uc2f9 \uc77d\uc5b4\uc11c \uc0d8\ud50c\uc774 \uc5b4\ub5a4 \uc885\ub958\uac00 \uc788\ub294\uc9c0 \ubaa9\ub85d\uc744 \ub9cc\ub4e0\ub2e4.<br \/>\n        <br \/>\n        2. \ubaa9\ub85d\uc5d0\uc11c \uc21c\uc11c\ub300\ub85c \uc77d\uc5b4\ub2e4\uac00 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uad6c\ud55c\ub2e4. \uc989, \ub370\uc774\ud130 \ud14c\uc774\ube14\uc744 \uc77d\uc73c\uba74\uc11c A\uc0d8\ud50c \uac12\ub9cc \uace8\ub77c\uc11c \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uad6c\ud558\uace0, \ub370\uc774\ud130 \ud14c\uc774\ube14\uc744 \ub610 \uc77d\uc73c\uba74\uc11c B\uc0d8\ud50c \uac12\ub9cc \uace8\ub77c\uc11c \uad6c\ud558\uace0 &#8230; \ub05d\ub0a0\ub54c\uae4c\uc9c0 \ubc18\ubcf5.<\/p>\n<p>        \uadf8\ub098\ub9c8 \uc870\uae08 \ub2e8\uc21c\ud558\uc9c0\ub9cc \ub370\uc774\ud130 \ud14c\uc774\ube14\uc744 \ub108\ubb34 \uc5ec\ub7ec\ubc88 \uc77d\ub294\ub2e4. \ub354\uad70\ub2e4\ub098, \ud56d\ubaa9 \uad6c\ubd84\uc774 \uc0d8\ud50c\ub85c\ub9cc \uc774\ub904\uc9c0\ub294\uac8c \uc544\ub2c8\ub77c \uc2e4\ud5d8 \ub0a0\uc9dc\uc640 \uc0d8\ud50c\uc758 \uc704\uce58\uc5d0 \ub530\ub77c\uc11c\ub3c4 \ub2ec\ub77c\uc9c4\ub2e4. \uc989, \uac19\uc740 \uc0d8\ud50c\uc774\ub77c\ub3c4 \ub2e4\ub978 \ub0a0\uc9dc\ub77c\uba74 \ub530\ub85c \ubd84\uc11d\ud574\uc57c \ud558\uace0, \ub2e4\ub978 \uc704\uce58\ub77c\uace0 \ud574\ub3c4 \ub530\ub85c \ubd84\uc11d\ud574\uc57c \ud55c\ub2e4. \uc774\ub7ec\uba74 \ud56d\ubaa9 \uad6c\ubd84 \ubaa9\ub85d\uc744 \uc5ec\ub7ec\uac1c \ub9cc\ub4e0 \ud6c4 \uac01\uac01\uc758 \ubaa9\ub85d\uc744 \uc774\uc6a9\ud574\uc11c \ubaa8\ub4e0 \uacbd\uc6b0\uc758 \uc218\ub97c \ub2e4 \ub530\uc9c0\ub294 \ub8e8\ud2f4\uc744 \ub123\uc5b4\uc57c \ud558\ub294\ub370 \uc774\uac74 \ub2e4\uc2dc \uc0bd\uc9c8\uc774\ub2e4.<\/p>\n<p>        \uadf8\ub798\uc11c<\/p>\n<p>        1. \ub370\uc774\ud130 \ud14c\uc774\ube14\uc5d0\uc11c \ud55c\uc904\uc744 \uc77d\uc5b4\uc628\ub2e4.<br \/>\n        <br \/>\n        2. \uae30\uc874\uc5d0 \uc5c6\ub358 \ud56d\ubaa9 \uad6c\ubd84\uc774\uba74? \uc0c8\ub85c \ud56d\ubaa9 \uad6c\ubd84\uc744 \ub9cc\ub4e4\uc5b4 \uc8fc\uace0 \ub370\uc774\ud130 \ubd84\uc11d\uc744 \uac31\uc2e0\ud55c\ub2e4<br \/>\n        <br \/>\n        2. \uae30\uc874\uc5d0 \uc788\ub358 \ud56d\ubaa9 \uad6c\ubd84\uc774\uba74? \ud574\ub2f9 \ud56d\ubaa9 \uad6c\ubd84\uc5d0 \ub370\uc774\ud130 \ubd84\uc11d\uc744 \uac31\uc2e0\ud55c\ub2e4<br \/>\n        <br \/>\n        3. \ub05d\uae4c\uc9c0 \uac04\ub2e4.<\/p>\n<p>        \uc5ec\uae30\uc5d0 \ub370\uc774\ud130 \ubd84\uc11d\uc744 \uac31\uc2e0\ud558\ub294 \ub8e8\ud2f4\uc774 \ucd94\uac00\ub418\ub294\ub370 \uc774\uac8c \uc870\uae08 \uc218\ud559\uc801\uc774\ub2e4. \uadf8\ub798\uc11c \uc774 \uae00\uc740 \uc218\ud559\uc5d0 \uad6c\ubd84\ub418\uc5b4 \uc788\ub2e4.<\/p>\n<p>        \uc9c0\uae08\uae4c\uc9c0 N\uac1c\uc758 \uc790\ub8cc\ub97c \uc774\uc6a9\ud574\uc11c \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uacc4\uc0b0\ud588\ub2e4\uace0 \ud558\uc790. \uc774\uac78 $m$\uacfc $\\sigma^2$\ub77c\uace0 \ud558\uc790. \uadf8\ub7f0\ub370 \uc5ec\uae30\uc5d0 N+1\ubc88\uc9f8 \uc790\ub8cc\uc778 $x_{N+1}$\uac00 \uc0c8\ub85c \ub4e4\uc5b4\uc654\ub2e4. \uc5b4\uca4c\uc9c0?<\/p>\n<p>        \uc0c8\ub85c\uc6b4 \ud3c9\uade0 $m&#8217;$\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \uad6c\ud560 \uc218 \uc788\ub2e4. (\uc65c \uadf8\ub7f0\uac00\ub294 \uc554\uc0b0\uc73c\ub85c \ud574\ubcf4\uc790.)<br \/>\n        <br \/>\n        $m&#8217; = \\frac{mN+x_{N+1}}{N+1}$<\/p>\n<p>        \uadf8\ub9ac\uace0 \uc0c8\ub85c\uc6b4 \ubd84\uc0b0 $\\sigma &#8216; ^2$\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \uad6c\ud560 \uc218 \uc788\ub2e4. \uc65c \uadf8\ub7f0\uac00\ub294 \uc9c1\uc811 \uacc4\uc0b0\ud574 \ubcf4\uc790.<\/p>\n<p>        $\\sigma &#8216; ^2= \\frac{N(\\sigma ^2 + m^2) + x_{N+1}^2}{N+1} &#8211; m&#8217;^2$<\/p>\n<p>        \uc5b4\uca0c\ub4e0 \uc704\uc640 \uac19\uc740 \uac04\ub2e8\ud55c \uacc4\uc0b0\uc73c\ub85c \uc790\ub8cc\uac00 \ucd94\uac00\ub420 \ub54c\ub9c8\ub2e4 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uac31\uc2e0\ud560 \uc218 \uc788\ub2e4. \ubb3c\ub860 \uc774\uac8c \uc704\uc5d0\uc11c \uc5ec\ub7ec\ubc88 \uc77d\uc5b4\uc624\ub294 \uc54c\uace0\ub9ac\uc998\ubcf4\ub2e4 \ub354 \uacc4\uc0b0\uc591\uc774 \uc801\uc744\uc9c0 \uc5b4\ub5a8\uc9c0\ub294 \ubaa8\ub974\uaca0\ub2e4. \ub09c \ub2e8\uc9c0 \uc774\ub7f0 \ubc29\uc2dd\uc73c\ub85c \ud504\ub85c\uadf8\ub7a8\uc744 \ub9cc\ub4e4\uace0 \uc2f6\uc5c8\uc744 \ubfd0\uc774\ub2e4.<\/p>\n<p>        &#8212;&#8212;&#8212;&#8212;-<br \/>\n        <br \/>\n        \ucd5c\uadfc\uc5d0 \uc774 \uc54c\uace0\ub9ac\uc998\uc744 \ub2e4\uc2dc \uc0ac\uc6a9\ud574\uc57c \ud574\uc11c \uc0dd\uac01\ud574\ubcf4\ub2c8, \uadf8\ub0e5 \ub2e8\uc21c\ud558\uac8c \uacc4\uc0b0\ud574\ub3c4 \ub41c\ub2e4.<br \/>\n        <br \/>\n        N\uac1c\uc758 \uc790\ub8cc\uc758 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \uc54c\uace0 \uc2f6\uc73c\uba74, x(i)\uc758 \ud569\uacfc x(i)\uc758 \uc81c\uacf1\uc758 \ud569\uc744 \uc77c\ub2e8 \ub2e4 \uacc4\uc0b0\ud55c\ub2e4.<br \/>\n        <br \/>\n        \uadf8\ub9ac\uace0 \uc790\ub8cc\ub97c \ucd9c\ub825\ud558\ub77c\uace0 \uc694\uccad\ud558\ub294 \uc2dc\uc810\uc5d0 \ud3c9\uade0\uacfc \ubd84\uc0b0\uc744 \ud55c\ubc88\ub9cc \uacc4\uc0b0\ud558\uba74 \ub41c\ub2e4.<\/p>\n<p>        \ucc98\uc74c\uc5d0 \uc0dd\uac01\ud55c \uacf5\uc2dd\uc740 \uc810\ud654\uc2dd\uc73c\ub85c \uc8fc\uc5b4\uc9c4 \uacf5\uc2dd\uc774\uc5c8\uace0 \uc880 \ub354 \ud765\ubbf8\ub85c\uc6b4 \uacc4\uc0b0\uc774\uc9c0\ub9cc, \ucef4\ud4e8\ud130\ud55c\ud14c \uc77c \uc2dc\ud0a4\ub824\uba74 \uc0c8\ub85c \uc0dd\uac01\ud55c \ubc29\ubc95\uc774 \uc880 \ub354 \ub098\uc744 \uac83 \uac19\ub2e4. (\ubb3c\ub860, \ucc98\uc74c\uc758 \uacf5\uc2dd\ub3c4 \uc4f8\ubaa8\uac00 \uc788\uae34 \ud558\ub2e4.)<\/p>\n<div style=\"width:100%;margin-top:30px;clear:both;height:30px\">\n<div style=\"width:31px;float:left;\">\n<a href=\"\/toolbar\/popup\/abuseReport\/?entryId=1968\" onclick=\"window.open(this.href, 'tistoryThisBlogPopup', 'width=550, height=510, toolbar=no, menubar=no, status=no, scrollbars=no'); return false;\"><br \/>\n<img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\uc2e0\uace0\" src=\"https:\/\/i0.wp.com\/t1.daumcdn.net\/tistory_admin\/static\/ico\/ico_spam_report.png\" style=\"border:0\"\/><br \/>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ud504\ub85c\uadf8\ub7a8\uc744 \ub9cc\ub4e4\ub2e4 \ubcf4\ub2c8 \ubcc4\uac78 \ub2e4 \ud558\uac8c \ub418\ub294 \uc0c1\ud669\uc774\ub2e4. (\ub0a9\ub55c\ud558\ub2e4\uac00 \uc0ac\ud3ec\uc9c8\ud558\ub2e4\uac00 \uc65c \ud504\ub85c\uadf8\ub798\ubc0d\uc774\ub0d0\uba74, \uc6c3\uc9c0\uc694 -_-; \ub0b4 \uc77c\uc774 \uc6d0\ub798 \uadf8\ub807\ub2e4. \ubb50\ub4e0\uc9c0 \ub2e4 \ud558\ub294&#8230;) \uc2e4\ud5d8 \uacb0\uacfc\ub97c \ubd84\uc11d\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc778\ub370, \ubd84\uc11d\uc740 \ubcc4\uac8c \uc544\ub2c8\ub77c \uc785\ub825\uac12\uc758 \ud3c9\uade0\uacfc \ud45c\uc900\ud3b8\ucc28(\ubd84\uc0b0\uc758 \uc81c\uacf1\uadfc)\ub97c \uacc4\uc0b0\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc774\ub2e4. \ubb38\uc81c\ub294 \uc785\ub825\uac12\uc744 \uc801\uc808\ud788 \uad6c\ubd84\ud574\uc57c \ud55c\ub2e4\ub294 \uc810\uc774\ub2e4. \uc989, \uc9c0\uae08 \uc77d\uc5b4\uc628 \uc785\ub825\uac12\uc774 \ub9c8\uc9c0\ub9c9 \uac12\uc774 \uc544\ub2d0 \uc218\ub3c4 \uc788\ub2e4\ub294 \uac83\uc774 \ubb38\uc81c\uc810\uc774\ub2e4. \uc6d0\ub798\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \ud504\ub85c\uadf8\ub7a8\uc744 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-9139","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2np","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/9139","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9139"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/9139\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9139"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}