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Box plot

By naditha | Jan 29, 2018 03:15PM CET

What do whiskers represent in the box plot? How are outliers calculated?

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By Efthalia | Jan 29, 2018 06:38PM CET | XLSTAT Agent

Hello Naditha,

You will find the answers below:

Lower whisker: Linf = X(i) such that {X(i) – [Q1 – 1.5 (Q3 – Q1)]} is minimum and X(i) ≥ Q1 – 1.5 (Q3 – Q1).
Upper whisker: Lsup = X(i) such that {X(i) – [Q3 + 1.5 (Q3 – Q1)]} is minimum and X(i) ≤ Q3 + 1.5 (Q3 – Q1).

In terms of extreme values, those outside the ]Q1 – 3 (Q3 – Q1); Q3 + 3 (Q3 – Q1) [ interval are displayed with the * symbol. Values that are in the [Q1 – 3 (Q3 – Q1); Q1 – 1.5 (Q3 – Q1)] or the [Q3 + 1.5 (Q3 – Q1); Q3 + 3 (Q3 – Q1)] intervals are displayed with the “o” symbol.

I hope this helps!

Regards,

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