http://commres.net/ 2026-06-17T05:03:25+00:00 http://commres.net/ http://commres.net/_media/wiki/logo.png text/html 2026-06-17T03:51:18+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/hkim/course_plan?rev=1781668278&do=diff Course Plan * Probability and Statistics (확률과통계) * Media Statistics (미디어통계) * Theories in Mediated Communication (미디에티드커뮤니케이션이론) * Social Networks in Mediated Communication (소셜네트워크이론과분석) text/html 2026-06-14T23:47:17+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/sequential_regression?rev=1781480837&do=diff Sequential or Hierarchical regression 연구자가 판단하여 독립변인들 중 필요한 것들을 묶어서 스테이지 별로 (단계 별) 넣고 분석하는 것을 말한다. Stepwise regression은 이를 컴퓨터나 계산방법을 통하여 수행하게 된다. $\hat{Y} = 6.399 + .012 X_{1} + -.545 X_{2} $$(1)$$(2)$$(3)$$(4)$ text/html 2026-06-14T23:44:46+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/beta_coefficients?rev=1781480686&do=diff Beta coefficients in linear regression \begin{align*} \large{\beta = b * \frac{sd(x)}{sd(y)}} \ \end{align*} # import test score data "tests_cor.csv" tests <- read.csv("http://commres.net/_media/r/tests_cor.csv") colnames(tests) <- c("ser", "sat", "clep", "gpa") tests <- subset(tests, select=c("sat", "clep", "gpa")) attach(tests) text/html 2026-06-14T23:44:15+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/c/ms/2026/schedule/w15.lecture.note?rev=1781480655&do=diff Sequential Regression Using Dummy Variables beta coefficients mediation analysis text/html 2026-06-14T23:15:20+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/using_dummy_variables?rev=1781478920&do=diff Categorical variables 2 groups rm(list=ls()) library(dplyr) library(ggplot2) ss <- function(x) { sum((x-mean(x))^2) } sp <- function(x, y) { sum((x-mean(x))*(y-mean(y))) } # 1. Generate numerical variable set.seed(12) n <- 30 n.1 <- round(rnorm(n, mean = 50, sd = 20),0) # Continuous variable n.2 = round(rnorm(n, 55, 20),0) n.3 = round(rnorm(n, 60, 22),0) sc <- data.frame(n.1,n.2,n.3) sc.s <- stack(sc) sc.s <- sc.s[-2] head(sc.s) c.1 <- (rep("lo", n)) c.2 <- (rep("mid", n)) c.3 <- rep… text/html 2026-06-11T07:09:04+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/index?rev=1781161744&do=diff Communication Research commres.net 환영합니다. 이 사이트는 Communication Research에 관한 사이트입니다. 커뮤니케이션 이론, 연구방법론, 미디어 연구 등등과 관련된 글과 생각을 모아 둡니다. 문서 인덱스 Class Related text/html 2026-06-09T23:49:23+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/c/ms/2026/schedule?rev=1781048963&do=diff 통계에 대한 기초적인 이해 가설과 가설검증 * 가설의 종류와 그 종류에 따른 통계분석법 * z-test * t-test * ANOVA * Factorial ANOVA * correlation * regression * multiple regression * factor analysis text/html 2026-06-09T23:44:27+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/c/ms/2026/schedule/w12.lecture.note?rev=1781048667&do=diff Regression multiple regression regression (회귀분석) 아래에서 다른 것은 이해하기 쉽지만 t.r 값과 t.b값의 (상관관계계수값과 ( r ), 리그레션의 계수값 (b 의 coefficient값)) significance level을 테스트할 때 쓰이는 se.res, se.b값을 구하는 것이 조금 복잡할 수 있다. 개념적으로\begin{eqnarray*} \text{Standard Error of the Sample Correlation} & = & \sqrt{ \dfrac{ \dfrac { \text{ss.res} } { \text{ss.tot} } } { (n-2) } } \\ & = & \sqrt {\dfrac {(1-R^2)} {n-2} } \end{eqnarray*}\begin{eqnarray*} \text{Standard Error of b} & = & \sqrt{\dfrac{ \text{MSE} } { \text{ss(x)} }} \\ … text/html 2026-06-09T23:14:39+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-231439.png&ns=pasted&rev=1781046879&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-231439.png?w=500&amp;h=500&amp;tok=06920d" alt="20260609-231439.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T23:06:01+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-230601.png&ns=pasted&rev=1781046361&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-230601.png?w=500&amp;h=500&amp;tok=a5bdcc" alt="20260609-230601.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T23:05:16+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-230516.png&ns=pasted&rev=1781046316&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-230516.png?w=500&amp;h=500&amp;tok=976eb1" alt="20260609-230516.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T23:05:05+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-230505.png&ns=pasted&rev=1781046305&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-230505.png?w=500&amp;h=500&amp;tok=b2f7a6" alt="20260609-230505.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T23:04:52+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-230452.png&ns=pasted&rev=1781046292&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-230452.png?w=500&amp;h=500&amp;tok=8363d2" alt="20260609-230452.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T22:44:30+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-224430.png&ns=pasted&rev=1781045070&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-224430.png?w=500&amp;h=500&amp;tok=aa2ab9" alt="20260609-224430.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T22:44:14+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=pasted%3A20260609-224414.png&ns=pasted&rev=1781045054&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/pasted/20260609-224414.png?w=500&amp;h=500&amp;tok=119c00" alt="20260609-224414.png" loading="lazy" width="500" height="500" /> text/html 2026-06-04T02:53:38+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=r%3Acolleges.csv&ns=r&rev=1780541618&tab_details=history&media_do=diff&do=media <img src="http://commres.net/lib/images/fileicons/svg/csv.svg" alt="colleges.csv" loading="lazy" width="500" height="500" /> text/html 2026-05-26T23:39:38+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=c%3Ams%3A2026%3Aschedule%3Apasted%3A20260526-233938.png&ns=c%3Ams%3A2026%3Aschedule%3Apasted&rev=1779838778&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/c/ms/2026/schedule/pasted/20260526-233938.png?w=500&amp;h=500&amp;tok=bf41ce" alt="20260526-233938.png" loading="lazy" width="500" height="500" /> text/html 2026-05-26T23:35:42+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=c%3Ams%3A2026%3Aschedule%3Apasted%3A20260526-233542.png&ns=c%3Ams%3A2026%3Aschedule%3Apasted&rev=1779838542&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/c/ms/2026/schedule/pasted/20260526-233542.png?w=500&amp;h=500&amp;tok=e06f73" alt="20260526-233542.png" loading="lazy" width="500" height="500" /> text/html 2026-05-25T03:03:52+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=c%3Ams%3A2026%3Aschedule%3Apasted%3A20260525-030352.png&ns=c%3Ams%3A2026%3Aschedule%3Apasted&rev=1779678232&tab_details=history&media_do=diff&do=media <img src="http://commres.net/_media/c/ms/2026/schedule/pasted/20260525-030352.png?w=500&amp;h=500&amp;tok=b4f327" alt="20260525-030352.png" loading="lazy" width="500" height="500" /> text/html 2026-05-25T02:30:03+00:00 hkimscil (hkimscil@undisclosed.example.com) http://commres.net/?image=types.of.correlations.pptx&ns=0&rev=1779676203&tab_details=history&media_do=diff&do=media <img src="http://commres.net/lib/images/fileicons/svg/pptx.svg" alt="types.of.correlations.pptx" loading="lazy" width="500" height="500" />