Download - Head first statistics ch15
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Head First Statistics
Ch 15
Correlation and regression
아키텍트를 꿈꾸는 사람들
발표 : 김연기
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Analyze sunshine and attendance
- 표준 편차나 평균값으로 예상 관중수를 찾을수 없다.
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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
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Analyze sunshine and attendance
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Analyze sunshine and attendance
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Positive Linear correlation
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Negative Linear correlation
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No correlation
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Correlation Vs. Causation
Correlation : 두 변수간 산술적인 관계가 있을때 상관관계(Correlation)라 할 수 있다.
Causation : 두변수간 수직적으로 표현 할수 없지만 직접적인 영향을가질때 원인(Causation)관계라 할수 있다.
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Predict values with a line of best fit
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Predict values with a line of best fit
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Predict values with a line of best fit
실제값과 예상값의 총 차이 :
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Sum Of Squared Errors
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Find Slope(기울기)
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Correlation Coefficient
두 변수간 밀접하게 관계하고 있는지 측정.
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Correlation Coefficient