http://www.commres.net/ 2026-04-10T18:55:52+00:00 http://www.commres.net/ http://www.commres.net/_media/wiki/logo.png text/html 2026-04-09T01:33:56+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/c/mrm/2026/schedule?rev=1775698436&do=diff 이전 페이지 ---- exploring media theories * Week 01: March 2, 5 * Week 02: March 9, 12 * Week 03: March 16, 19 * Week 04: March 23, 26 (the 1st quiz) ---- choosing media theories * Week 05: March 30, April 2 * Week 06: April 6, 9 ---- developing and revising hypotheses text/html 2026-04-07T23:02:31+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/r/two_sample_t-test?rev=1775602951&do=diff Independent sample t-test 의 standard error 값을 구하는 방법이 얼른 머리에 들어오지 않으면, see mean and variance of the sample mean: 샘플평균들의 집합이 가지는 평균과 분산 (CLT) sa statistical review: 분산의 계산 두 샘플을 취해서 평균을 구한 후 (mean of A, mean of B), 그 차이를 기록하는 것을 무한히 하여 그 분포를 구하는 것은 아래와 같이 정리, 이해할 수 있다. \begin{eqnarray} E \left[ \overline{X} - \overline{Y} \right] & = & E \left[ \overline{X} \right] - E \left[ \overline{Y} \right] & = & {\mu_{X}} - {\mu_{Y}} \\ V \left[ \overline{X} - \overline{Y} \right] & = & V \left[ \overli… text/html 2026-04-07T23:00:52+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/c/ms/2026/lecture_note_week_05?rev=1775602852&do=diff 모집단의 평균과 표준편차를 알고 있을 때 독립변인의 효과를 알고 싶을 때, 혹은 모집단의 성격이 참인지 거짓인지 알고 싶을 때 One sample z-test t-test 꼭 읽을 것 Distribution of Sample Means -- mu = 40, sigma = 4 (hence var = 16) 인 모집단에서 n = n 사이즈의 샘플링을 무한 반복할 때 그 샘플평균들이 모인 집합 $ \frac {\text{obtained difference}} {\text{se}} = \frac {\text{difference due to the IV}} {\text{random error}} $\begin{eqnarray} z\;\;\;\text{or}\;\;\;t & = & \frac{\overline{X}-\mu}{\sigma_{\overline{X}} }, \quad \text{where } \;\; \sigma_{\overline{X}} = \frac{\sigma}{\sqrt{n… text/html 2026-04-07T22:39:53+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/two_sample_t-test?rev=1775601593&do=diff Two sample t-test Independent sample t-test, two sample t-test Difference of Two means Hypothesis test 등 같은 의미 Theory 가정 * 두 모집단 p1, p2 가 있다 * 각 집단에서 샘플을 취해서 그 평균을 구한 후 * 그 차이를 기록한다. \begin{eqnarray*} \overline{X} & \sim & \left( \mu, \;\; \frac{\sigma^2}{n} \right) \\ & & \text{in other words, } \\ E \left[ \overline{X} \right] & = & \mu \\ Var \left[ \overline{X} \right] & = & \frac{\sigma^2}{n} \\ & & \text {Assuming that X1 and X2 are independent } \\ \overline{X_{1}} & \sim & \l… text/html 2026-04-07T22:30:39+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/mean_and_variance_of_the_sample_mean?rev=1775601039&do=diff Mean and variance of sample mean 전제: Expected value (기대값)와 Variance (분산)의 연산에 과한 법칙으로는 참조. X,Y are Independent variables. \begin{eqnarray*} E[aX] &=& a E[X] \\ E[X+Y] &=& E[X] + E[Y] \\ Var[aX] &=& a^{\tiny{2}} Var[X] \\ Var[X+Y] &=& Var[X] + Var[Y] \\ Var[X-Y] &=& Var[X] + Var[Y] \end{eqnarray*} Mean of the sample mean 평균이 (mean) $\mu$ 이고, 분산이 (variance) $\sigma^{2}$ 인 모집단에서 (population) 독립적으로 추출되어 관찰되는 $X_{1}, X_{2}, . . . , X_{n}$$X_1$\begin{eqnarray*} X_{1}, X_{2}, X_{3}, . . . , X_… text/html 2026-04-06T14:53:30+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/c/ms/2026/schedule?rev=1775487210&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 2026-04-06T13:45:40+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/c/ms/2026/schedule/week06_t-test_and_anova_note?rev=1775483140&do=diff see anova note text/html 2026-04-06T03:13:53+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/c/mrm/2026/schedule/building_hypotheses?rev=1775445233&do=diff Research Idea: * How relating other influencers affect users' experiences? * search results * How relating other influencers affect users' experience of youtube viewing * search results * watching influencers' content and users' behavior change * search results * The effect of social media influencers' on teenagers Behavior: an empirical study using cognitive map technique * not a good example of building hypotheses text/html 2026-04-05T23:57:44+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=r%3Apasted%3A20260405-235744.png&ns=r%3Apasted&rev=1775433464&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/r/pasted/20260405-235744.png?w=500&amp;h=500&amp;tok=7358e9" alt="20260405-235744.png" loading="lazy" width="500" height="500" /> text/html 2026-04-05T23:57:33+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=r%3Apasted%3A20260405-235733.png&ns=r%3Apasted&rev=1775433453&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/r/pasted/20260405-235733.png?w=500&amp;h=500&amp;tok=5e1eed" alt="20260405-235733.png" loading="lazy" width="500" height="500" /> text/html 2026-04-05T23:50:00+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=pasted%3A20260405-235000.png&ns=pasted&rev=1775433000&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/pasted/20260405-235000.png?w=500&amp;h=500&amp;tok=4c987c" alt="20260405-235000.png" loading="lazy" width="500" height="500" /> text/html 2026-04-05T23:02:21+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/factor_analysis/eg.s?rev=1775430141&do=diff <https://journals.sagepub.com/doi/full/10.1177/1077699015606057> <https://www.quora.com/How-can-we-determine-the-credibility-of-a-news-article-before-reading-it-Is-there-a-way-to-identify-if-a-news-source-is-reliable-or-not> Credibility of News Stories * 충분한 근거와 자료를 제시하는 기사가 더 믿을 만하다. * 외부 압력 없이 독립적으로 작성되어야 한다. * 기자의 개인적 의견이 많이 포함된 기사는 신뢰하기 어렵다. text/html 2026-04-05T23:01:59+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=factor_analysis%3Apasted%3A20260405-230159.png&ns=factor_analysis%3Apasted&rev=1775430119&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/factor_analysis/pasted/20260405-230159.png?w=500&amp;h=500&amp;tok=6cd40e" alt="20260405-230159.png" loading="lazy" width="500" height="500" /> text/html 2026-04-03T08:53:28+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260403-085328.png&ns=c%3Ams%3A2026%3Apasted&rev=1775206408&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260403-085328.png?w=500&amp;h=500&amp;tok=d18461" alt="20260403-085328.png" loading="lazy" width="500" height="500" /> text/html 2026-04-03T08:53:08+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260403-085308.png&ns=c%3Ams%3A2026%3Apasted&rev=1775206388&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260403-085308.png?w=500&amp;h=500&amp;tok=b2ea86" alt="20260403-085308.png" loading="lazy" width="500" height="500" /> text/html 2026-04-03T08:31:03+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260403-083103.png&ns=c%3Ams%3A2026%3Apasted&rev=1775205063&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260403-083103.png?w=500&amp;h=500&amp;tok=6b20df" alt="20260403-083103.png" loading="lazy" width="500" height="500" /> text/html 2026-04-03T08:30:00+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260403-083000.png&ns=c%3Ams%3A2026%3Apasted&rev=1775205000&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260403-083000.png?w=500&amp;h=500&amp;tok=439bf9" alt="20260403-083000.png" loading="lazy" width="500" height="500" /> text/html 2026-04-03T08:29:41+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260403-082941.png&ns=c%3Ams%3A2026%3Apasted&rev=1775204981&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260403-082941.png?w=500&amp;h=500&amp;tok=81c642" alt="20260403-082941.png" loading="lazy" width="500" height="500" /> text/html 2026-04-01T01:52:29+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=pasted%3A20260401-015229.png&ns=pasted&rev=1775008349&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/pasted/20260401-015229.png?w=500&amp;h=500&amp;tok=9e3a3e" alt="20260401-015229.png" loading="lazy" width="500" height="500" /> text/html 2026-03-31T23:48:24+00:00 hkimscil (hkimscil@undisclosed.example.com) http://www.commres.net/?image=c%3Ams%3A2026%3Apasted%3A20260331-234824.png&ns=c%3Ams%3A2026%3Apasted&rev=1775000904&tab_details=history&media_do=diff&do=media <img src="http://www.commres.net/_media/c/ms/2026/pasted/20260331-234824.png?w=500&amp;h=500&amp;tok=b7e594" alt="20260331-234824.png" loading="lazy" width="500" height="500" />