thesIt » boxplot http://lakm.us/thesit computer science research log in semi microbloging style Tue, 24 Aug 2010 21:34:55 +0000 http://wordpress.org/?v=2.9 en hourly 1 Boxplot drawing http://lakm.us/thesit/308/boxplot-drawing/ http://lakm.us/thesit/308/boxplot-drawing/#comments Sun, 22 Aug 2010 07:29:29 +0000 Arif http://xp-racy.lan/s2/?p=308 Drawing boxplot from the following data, whiskers are determined from 1.5 IQR

no datum drawn as
1 0.026 outlier
2 0.048 whisker low
3 0.070 Q1
4 0.072
5 0.076 Q2
6 0.084
7 0.086
8 0.099 Q3
9 0.102
10 0.103 whisker high

Outlier

0.026 becomes outlier because 1.5IQR boundary (IQR = Q3 – Q1 = 0.02908) for the lower boundary is Q1 -1.5IQR = 0.0404, hence whisker is 0.048 which is more close to the box inside making 0.026 outlier.

boxplot-basic-concept-example.png

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