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    <channel rdf:about="http://www.commres.net/feed.php">
        <title>COMMunication&lt;br /&gt;RESearch.NET - c:ms</title>
        <description></description>
        <link>http://www.commres.net/</link>
        <image rdf:resource="http://www.commres.net/_media/wiki/logo.png" />
       <dc:date>2026-04-17T08:32:23+00:00</dc:date>
        <items>
            <rdf:Seq>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2016?rev=1550535482&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2017?rev=1490743889&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2018?rev=1520991377&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2019?rev=1552449450&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2020?rev=1585810598&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2021?rev=1709510310&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2022?rev=1646273804&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2023?rev=1741129380&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2024?rev=1710112334&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2025?rev=1741564623&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/2026?rev=1772584607&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/covariance_and_correlation_coefficient?rev=1716161058&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/lecturer_private_note?rev=1694041753&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/multiple_regression_lecture_note_for_r?rev=1727654187&amp;do=diff"/>
                <rdf:li rdf:resource="http://www.commres.net/c/ms/regression_lecture_note_for_r?rev=1717661258&amp;do=diff"/>
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        <title>COMMunication<br />RESearch.NET</title>
        <link>http://www.commres.net/</link>
        <url>http://www.commres.net/_media/wiki/logo.png</url>
    </image>
    <item rdf:about="http://www.commres.net/c/ms/2016?rev=1550535482&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2019-02-19T00:18:02+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2016</title>
        <link>http://www.commres.net/c/ms/2016?rev=1550535482&amp;do=diff</link>
        <description>Media Statistics: 2016

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월/수 A1 Block 교시: 9:00 - 10:15
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)
	*</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2017?rev=1490743889&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2017-03-28T23:31:29+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2017</title>
        <link>http://www.commres.net/c/ms/2017?rev=1490743889&amp;do=diff</link>
        <description>Media Statistics: 2017

Class site: &lt;http://commres.net/&gt;
Ajou Blackboard page

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  수|금 B1 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2018?rev=1520991377&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2018-03-14T01:36:17+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2018</title>
        <link>http://www.commres.net/c/ms/2018?rev=1520991377&amp;do=diff</link>
        <description>Media Statistics: 2018

Class site: &lt;http://commres.net/&gt;
Media Statistics, Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  수|금 B1 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2019?rev=1552449450&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2019-03-13T03:57:30+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2019</title>
        <link>http://www.commres.net/c/ms/2019?rev=1552449450&amp;do=diff</link>
        <description>Media Statistics: 2019

Class site: &lt;http://commres.net/&gt;
Media Statistics, Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월|목 B2 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2020?rev=1585810598&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2020-04-02T06:56:38+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2020</title>
        <link>http://www.commres.net/c/ms/2020?rev=1585810598&amp;do=diff</link>
        <description>Media Statistics: 2020

Class site: &lt;http://commres.net/&gt;
Media Statistics, 2020 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 
	*  Class survey 참여: 조별활동과 연구주제에 대한 결정과 관련하여 첫 시간에 클래스서베이를 진행합니다. 약 10분에서 40분 정도가 걸립니다. 참여할</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2021?rev=1709510310&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2024-03-03T23:58:30+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2021</title>
        <link>http://www.commres.net/c/ms/2021?rev=1709510310&amp;do=diff</link>
        <description>Media Statistics: 2021

Class page: &lt;http://commres.net/wiki/c/ms/2021&gt;
Class schedule page
Media Statistics, 2021 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 
	*  Class survey 참여: 조별활동과 연구주제에 대한 결정과 관련하여 첫 시간에 클래스서베이를 진행합니다. 약 10분에서 40분 정도가 걸립니다. 참여할</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2022?rev=1646273804&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2022-03-03T02:16:44+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2022</title>
        <link>http://www.commres.net/c/ms/2022?rev=1646273804&amp;do=diff</link>
        <description>Media Statistics: 2022

Class page: &lt;http://commres.net/wiki/c/ms/2022&gt;
Class schedule page
Media Statistics, 2022 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월|목 B2 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2023?rev=1741129380&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2025-03-04T23:03:00+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2023</title>
        <link>http://www.commres.net/c/ms/2023?rev=1741129380&amp;do=diff</link>
        <description>Media Statistics: 2025

Class page: &lt;http://commres.net/wiki/c/ms/2025&gt;
Class schedule page
Media Statistics, 2025 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월|목 B2 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2024?rev=1710112334&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2024-03-10T23:12:14+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2024</title>
        <link>http://www.commres.net/c/ms/2024?rev=1710112334&amp;do=diff</link>
        <description>Media Statistics: 2024

Class page: &lt;http://commres.net/wiki/c/ms/2024&gt;
Class schedule page

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 
	*  Class survey 참여: 조별활동과 연구주제에 대한 결정과 관련하여 첫 시간에 클래스서베이를 진행합니다. 약 10분에서 40분 정도가 걸립니다. 참여할</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2025?rev=1741564623&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2025-03-09T23:57:03+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2025</title>
        <link>http://www.commres.net/c/ms/2025?rev=1741564623&amp;do=diff</link>
        <description>Media Statistics: 2025

Class page: &lt;http://commres.net/wiki/c/ms/2025&gt;
Class schedule page
Media Statistics, 2025 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note(Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월|목 B2 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/2026?rev=1772584607&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2026-03-04T00:36:47+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>2026</title>
        <link>http://www.commres.net/c/ms/2026?rev=1772584607&amp;do=diff</link>
        <description>Media Statistics: 2026

Class page: &lt;http://commres.net/wiki/c/ms/2026&gt;
Class schedule page
Media Statistics, 2026 Spring at Ajou Blackboard

Syllabus

	*  Lecturer&#039;s Note (Private)
	*  조교 정보 아래에 있습니다. 

기본정보

	*  월|목 B2 Block 교시: 10:30-11:45
	*  교실: 산학원 B103 (지하강의실)
	*  강의: 김효동 (hkimscil at ajou dot ac dot kr)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/covariance_and_correlation_coefficient?rev=1716161058&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2024-05-19T23:24:18+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>covariance_and_correlation_coefficient</title>
        <link>http://www.commres.net/c/ms/covariance_and_correlation_coefficient?rev=1716161058&amp;do=diff</link>
        <description>rnorm2 &lt;- function(n,mean,sd) { mean+sd*scale(rnorm(n)) } 

x &lt;- rnorm2(100, 100, 10) 
y.error &lt;- rnorm(100, 0, 4)
y &lt;- 3*x + y.error
cor(x,y)</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/lecturer_private_note?rev=1694041753&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2023-09-06T23:09:13+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>lecturer_private_note</title>
        <link>http://www.commres.net/c/ms/lecturer_private_note?rev=1694041753&amp;do=diff</link>
        <description>2021

Grouping


IMPORT DATA VIA DL EDITOR
--------------------------------------------------------------------------------



              1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 
             게임 시각 디지 영상 제작 방송 스마 데이 게임 어플 3D 게임 콘텐 브랜 데이 CG 사운 영상 모바 백앤 웹디 ux 
             그래 디자 털디 연출 PD (지 트콘 터사 프로 리케 컴퓨 기획 츠크 드디 터엔 아티 드슈 테크 일프  드 자인 /u 
             픽디  인 자인       상파 텐츠 이언 그램 이션 터그    리에 자인 지니 스트 퍼바 니컬 로그       i디 
             자인             +종 기획  스    개발 래픽    이터  …</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/multiple_regression_lecture_note_for_r?rev=1727654187&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2024-09-29T23:56:27+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>multiple_regression_lecture_note_for_r</title>
        <link>http://www.commres.net/c/ms/multiple_regression_lecture_note_for_r?rev=1727654187&amp;do=diff</link>
        <description>Multiple regression with pr, spr, zero-order r


# multiple regression: a simple e.g.
#
#
rm(list=ls())
d &lt;- read.csv(&quot;http://commres.net/wiki/_media/regression01-bankaccount.csv&quot;) 
d

colnames(d) &lt;- c(&quot;y&quot;, &quot;x1&quot;, &quot;x2&quot;)
d
# attach(d)
lm.y.x1 &lt;- lm(y ~ x1, data=d)
summary(lm.y.x1)

lm.y.x2 &lt;- lm(y ~ x2, data=d)
summary(lm.y.x2)

lm.y.x1x2 &lt;- lm(y ~ x1+x2, data=d)
summary(lm.y.x1x2)


lm.y.x1x2$coefficient
# y.hat = 6.399103 + (0.011841)*x1 + (−0.544727)*x2 
a &lt;- lm.y.x1x2$coefficient[1]
b1 &lt;- lm.y…</description>
    </item>
    <item rdf:about="http://www.commres.net/c/ms/regression_lecture_note_for_r?rev=1717661258&amp;do=diff">
        <dc:format>text/html</dc:format>
        <dc:date>2024-06-06T08:07:38+00:00</dc:date>
        <dc:creator>Anonymous (anonymous@undisclosed.example.com)</dc:creator>
        <title>regression_lecture_note_for_r</title>
        <link>http://www.commres.net/c/ms/regression_lecture_note_for_r?rev=1717661258&amp;do=diff</link>
        <description>Code

You need to install some packages 


install.packages(&quot;lm.beta&quot;)
install.packages(&quot;ppcor&quot;) 
install.packages(&quot;ggplot2&quot;)




################
rnorm2 &lt;- function(n,mean,sd) { mean+sd*scale(rnorm(n)) } 
n &lt;- 16

set.seed(101)
x &lt;- rnorm2(n, 265, 15) 
rand.00 &lt;- rnorm2(n, 0, 12)

rand.01 &lt;- rnorm2(n, 0, 240)
plot(rand.01)
points(rand.00, col=&quot;red&quot;)

b &lt;- 170 / 265
b &lt;- round(b,1)
b
y &lt;- b * x + rand.00

df &lt;- data.frame(x, y)
head(df)

# plot method 0
plot(x,y)

# method 1
plot(x, y, pch = 1, …</description>
    </item>
</rdf:RDF>
