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목록전체 글 (188)
Channi Studies
Slope and Y-intercept of The Regression Line | 회귀선의 기울기와 y절편
In a simple linear regression line (LMS), the regression line can be expressed as following equation:y = ax + bwherey = The variable that you want to predict (예측하고 싶은 값) | Dependent variable (종속 변수)x = The variable that you are using to predict (예측에 사용하는 값) | Independent variable (독립 변수)a = Slope (기울기)b = y-intercept (y 절편) 그렇다면, y = ax+b 에서 slope(a)와 y-intercept(b)는 어떻게 구하는지 알아보겠습니다. Recall, r ..
Trend, Pattern, and The Correlation Coefficient (r)
When there are two numerical variables, there are TrendPositive associationNegative association PatternAny discernible "shape" in the scatterLinear Non-linear Visualize, then quantify The Correlation Coefficient rMeasures linear association. It is based on the standard units. r is defined as:The average of product of (x in standard units) and (y in standard units) 표준 단위 x와 표준 단위 y의 곱의 평균 In P..
Confidence Interval is the interval of estimates of a parameter.It's based on random sampling. 가장 널리 사용되는 것은 95% Confidence Interval 입니다. Here, '95%' is called the confidence level.it could be any percent between 0 - 100.Higher confidence level means wider intervals. Confidence interval can be considered 'Good' if it contains the parameter.The confidence is in the process that creates the inter..
A/B testing is a type of experiment in Data Science that compare values of sampled individuals in Group A with values of sampled individuals in Group B.Q. Do the two sets of values come from the same underlying distribution? 예를 들어, 대한민국의 A 지역에서 샘플링을 통해 측정한 평균 신장이 165cm, B 지역에서는 170cm라고 해보겠습니다. (observed statistic)여기서, A와 B 지역의 평균 신장 차이가 same underlying distribution (대한민국 전체 신장 분포) 에서 비롯된 것으로 판단..