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standard_error_of_regression_coefficients [2026/06/05 12:16] – [Linear algebra] hkimscilstandard_error_of_regression_coefficients [2026/06/05 23:04] (current) hkimscil
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-====== Standard Error of Regression Coefficient ======+====== Standard Error of Regression Coefficients ======
 see https://academicweb.nd.edu/~rwilliam/stats1/x91.pdf see https://academicweb.nd.edu/~rwilliam/stats1/x91.pdf
 $ \hat{Y} = a + b X $ 에서 b 에 대한 standard error 값을 말한다. 이 standard error는 샘플에서 구한 b값으로 모집단의 (population의) b값을 추정하는 데 쓰인다.  $ \hat{Y} = a + b X $ 에서 b 에 대한 standard error 값을 말한다. 이 standard error는 샘플에서 구한 b값으로 모집단의 (population의) b값을 추정하는 데 쓰인다. 
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 & = & (y - X b)'(y - X b) \\ & = & (y - X b)'(y - X b) \\
 & = & y'y - b' X' y - y' X b + 'b X' X b \\ & = & y'y - b' X' y - y' X b + 'b X' X b \\
-& & b' X y = y' X b \\+& & \because \;\; b' X y = y' X b \\
 & = & \underbrace{y'y}_{(1)} - \underbrace{2 b' X' y}_{(2)} +  \underbrace{b' X' X b}_{(3)} \\ & = & \underbrace{y'y}_{(1)} - \underbrace{2 b' X' y}_{(2)} +  \underbrace{b' X' X b}_{(3)} \\
 \\ \\
standard_error_of_regression_coefficients.1780661801.txt.gz · Last modified: by hkimscil

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