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--- b:head_first_statistics:measuring_central_tendency [2025/09/16 22:07] – [skewedness] hkimscil
+++ b:head_first_statistics:measuring_central_tendency [2026/09/08 23:24] (current) – [outlier] hkimscil
@@ Line 35: / Line 35: @@
 \end{split}
 \end{equation*}
+<code>
+> # mean
+> x <- c(19, 19, 20, 20, 20, 21)
+> sum(x)
+[1] 119
+> length(x)
+[1] 6
+> sx <- sum(x)
+> nx <- length(x)
+> sx/nx
+[1] 19.83333
+> mean(x)
+[1] 19.83333
+</code>
 ===== outlier =====
@@ Line 40: / Line 56: @@
 [{{eg.distribution.jpg}}]
 </WRAP>
+<code>
+> # mean
+> x <- c(19, 19, 20, 20, 20, 21)
+> sx <- sum(x)
+> nx <- length(x)
+> sx/nx
+[1] 19.83333
+> mean(x)
+[1] 19.83333
+>
+> y <- c(3,19,20,21,34,37)
+> mean(y)
+[1] 22.33333
+>
+> xy <- cbind(x, y)
+> boxplot(xy, col=c("orange", "purple"),
++         names = c("x", "y"))
+</code>
+{{.:pasted:20260908-232337.png}}
 ===== skewedness =====
 see [[:b/head_first_statistics/visualization#histogram_skewedness]]