1.3 Working with Data: An Introduction to R

Video 6: Data Analysis - Plots and Summary Tables

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In the above video, we state that the outliers in a boxplot are computed as any points greater than the third quartile plus the inter-quartile range (IQR), or any points less than the first quartile minus the inter-quartile range (IQR). They are actually computed as any points greater than the third quartile plus 1.5*IQR, or less than the first quartile minus 1.5*IQR.