Box Plots for Data Analysis

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Learn how to interpret box plots to analyze data effectively. Discover how to read box plots, identify median and quartiles, understand whiskers, and determine data distribution using R. Explore what to look for in box plots for insights into symmetry, outliers, central tendencies, and overlapping distributions in biological data analysis.

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Uploaded on Apr 23, 2025 | 0 Views

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How to read a box-plot 1

How to read a box-plot 80 Height (cm) 60 40 20 Control Herbivory Water 2

How to read a box-plot Median 1, 3, 3, 6, 7, 8, 9 Median = 6 1, 2, 3, 4, 5, 6, 8, 9 Median = (4 + 5)/2 = 4.5 80 Height (cm) 60 40 20 Control Herbivory Water 3

How to read a box-plot Median 1, 3, 3, 6, 7, 8, 9 Median = 6 1, 2, 3, 4, 5, 6, 8, 9 Median = (4 + 5)/2 = 4.5 80 Height (cm) 60 40 20 1st and 3rd quartiles Mark where 25% (Q1) and 75% (Q3) of the data lie Control Herbivory Water 4

How to read a box-plot Median 1, 3, 3, 6, 7, 8, 9 Median = 6 1, 2, 3, 4, 5, 6, 8, 9 Median = (4 + 5)/2 = 4.5 80 Height (cm) 60 40 20 1st and 3rd quartiles Mark where 25% (Q1) and 75% (Q3) of the data lie Control Herbivory Water Whiskers Upper whisker = Q3 + 1.5 * (Q3 - Q1) (Unless this lies beyond last point) Lower whisker = Q1 1.5 * (Q3 Q1) (Unless this lies beyond first point) 5

How to read a box-plot A box plot s shape indicates the data s distribution. Let s use R to illustrate. 6

What to look for? Ultimately, what we look for depends on the biology that interests us. 80 Height (cm) 60 Are box plots symmetrical? Are boxplots of similar breadth? Outliers? Do boxplots have similar central tendencies? To what extent do distributions overlap? 40 20 Control Herbivory Water 7

Box Plots for Data Analysis

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