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Head First Statistics
          Ch 15
Correlation and regression

 아키텍트를 꿈꾸는 사람들
    발표 : 김연기
Analyze sunshine and
       attendance


- 표준 편차나 평균값으로 예상 관중수를 찾을수 없다.
Bivariate Data
- bivariate Data : 관찰할때 2개의 상태값을 가지는 데이터.
- dependent variable : 관측 데이터에서 영향을 미치는 변수
-Independent variable : 독립변수로 인해 발생되는 응답 변수

               Dependent variable




                Independent variable
Analyze sunshine and
     attendance
Analyze sunshine and
     attendance
Positive Linear correlation
Negative Linear correlation
No correlation
Correlation Vs. Causation
Correlation : 두 변수간 산술적인 관계가 있을때 상관관계(Correlation)
라 할 수 있다.

Causation : 두변수간 수직적으로 표현 할수 없지만 직접적인 영향을
가질때 원인(Causation)관계라 할수 있다.
Predict values with a line of
           best fit
Predict values with a line of
           best fit
Predict values with a line of
           best fit




실제값과 예상값의 총 차이 :
Sum Of Squared Errors
Find Slope(기울기)
Correlation Coefficient




두 변수간 밀접하게 관계하고 있는지 측정.
Correlation Coefficient

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