Differences

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--- correlation [2019/12/19 12:28] – [e.g. 1,] hkimscil
+++ correlation [2019/12/19 12:36] – [e.g. 2,] hkimscil
@@ Line 187: / Line 187: @@
 & = & .875 \nonumber
 \end{eqnarray}
+참고로 아래는 Covariance 대 Variance 비율로 계산한 것
+\begin{eqnarray*}
+r & = & \frac {Cov(X,Y)} {\sqrt{Var(X) Var(Y)}} \\
+r & = & \frac {\frac{SP}{n-1}}  {\sqrt{\frac{(SS_X)}{n-1} \frac{(SS_Y)}{n-1}}} \\
+\end{eqnarray*}
 혹은,
-\begin{eqnarray}
+\begin{eqnarray*}
-SS_{\tiny X} & = & \sum X^2 - \frac{(\sum X)^2}{n} \nonumber \\
+SS_{X} & = & \sum X^2 - \frac{(\sum X)^2}{n} \\
-& = & \textstyle 244 - \frac{(30)(30)}{5} \nonumber \\
+& = & 244 - \frac{(30)(30)}{5} \\
-& = & 64 \nonumber
+& = & 64
-\end{eqnarray}
+\end{eqnarray*}
 \begin{eqnarray}