c:ps1-2:2019:schedule
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c:ps1-2:2019:schedule [2019/09/30 20:26] – [Week03 (Sep 16, 18)] hkimscil | c:ps1-2:2019:schedule [2019/10/10 01:31] – hkimscil | ||
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<WRAP half column> | <WRAP half column> | ||
===== ideas and concepts | ===== ideas and concepts | ||
- | 정보의 시각화: 첫인상 | + | [[:b:head first statistics:Visualization|정보의 시각화]] |
- | * {{: | + | |
- | + | ||
- | * Scatter plot | + | |
- | < | + | |
- | attach(mtcars) | + | |
- | plot(wt, mpg, main=" | + | |
- | | + | |
- | | + | |
- | + | ||
- | {{: | + | |
- | + | ||
- | explanatory (설명) variable at x axis | + | |
- | response (반응) at y axis | + | |
- | + | ||
- | But, it does mean __no causal relationship__ between the two variables. Association between two does not guarantee a causal relationship. | + | |
- | + | ||
- | Drawing a line among the data. | + | |
- | < | + | |
- | abline(lm(mpg~wt), | + | |
- | lines(lowess(wt, | + | |
- | {{: | + | |
- | + | ||
- | + | ||
- | A bit more fancy line | + | |
- | < | + | |
- | # by Number of Car Cylinders | + | |
- | library(car) | + | |
- | scatterplot(mpg ~ wt | cyl, data=mtcars, | + | |
- | | + | |
- | | + | |
- | | + | |
- | {{: | + | |
- | + | ||
- | Line can be: | + | |
- | + | ||
- | **__관계의 방향 (direction)__** | + | |
- | ^ 관계의 방향 | + | |
- | | {{: | + | |
- | + | ||
- | + | ||
- | **__관계의 모양 (shape)__** | + | |
- | ^ 관계의 모양 | + | |
- | | {{: | + | |
- | + | ||
- | **__관계의 정도 (힘)__** | + | |
- | ^ 관계의 정도 (힘) ^^ | + | |
- | | [{{: | + | |
- | | [{{:r.StrengthC.png|Figure_4-3}}] | + | |
- | <WRAP clear /> | + | |
- | Pearson' | + | |
- | __Relations, | + | |
- | [{{: | + | |
- | <WRAP clear /> | + | |
- | + | ||
- | __Interpretation with limited range__ | + | |
- | [{{: | + | |
- | [{{: | + | |
- | 데이터의 [[Range]]에 대한 판단에 신중해야 한다. 왜냐 하면, 데이터의 어느 곳을 자르느냐에 따라서 r 값이 심하게 변하기 때문이다. | + | |
- | <WRAP clear /> | + | |
- | __Outliers__ | + | |
- | [{{: | + | |
- | [{{: | + | |
- | 위의 설명과 관련하여, | + | |
- | [{{: | + | |
- | + | ||
- | make it sure that there is __no data entry error__. | + | |
- | {{: | + | |
- | + | ||
- | + | ||
- | <WRAP clear /> | + | |
- | + | ||
- | see | + | |
- | https:// | + | |
- | {{youtube> | + | |
</ | </ | ||
- | |||
<WRAP half column> | <WRAP half column> | ||
- | {{: | ||
- | |||
- | {{: | ||
- | |||
- | < | ||
- | > colnames(le)[1] <- " | ||
- | > lea <- le$X2017 | ||
- | > leb <- lea[complete.cases(lea)] | ||
- | > hist(leb, color=" | ||
- | |||
- | {{: | ||
- | |||
- | {{: | ||
- | |||
- | {{: | ||
- | |||
- | {{: | ||
- | |||
- | box plot | ||
- | < | ||
- | > boxplot(mpg~cyl, | ||
- | + | ||
- | > | ||
- | > </ | ||
- | {{: | ||
===== Assignment ===== | ===== Assignment ===== | ||
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====== Week04 (Sep 23, 25) ====== | ====== Week04 (Sep 23, 25) ====== | ||
<WRAP half column> | <WRAP half column> | ||
- | [[: | + | [[:b:head first statistics: |
===== ideas and concepts | ===== ideas and concepts | ||
</ | </ |
c/ps1-2/2019/schedule.txt · Last modified: 2019/12/10 12:34 by hkimscil