Five-number summary and boxplot

Definition taught in Descriptive statistics, part of Data analysis

Five-number summary and boxplot

Serum creatinine for the 299 patients. From Descriptive statistics.

Type	Definition
Taught in	Descriptive statistics
Part	Data analysis

The five-number summary of a sample is its minimum, first quartile, median, third quartile and maximum. A boxplot draws the box from the first to the third quartile with a line at the median, and whiskers out to the most extreme data within 1.5 interquartile ranges of the box. Points beyond the whiskers are drawn individually as possible outliers.

Figures

Serum creatinine on a log scale, by survival. Patients who died had higher creatinine on the whole, though the two groups overlap. From Descriptive statistics.

Used in

• Taught in Descriptive statistics, where the derivation and examples are.
• Also used in Regression examples
• All 2 questions on Descriptive statistics

See also

Sample quantile · Interquartile range · Sample variance and standard deviation · Normal quantile plot

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