Box Plot and Anomaly Detection in 1D

Percentile:
The kth percentile of a set of data in numerical order is the value x(i) having the property that k percent of the data entries lie at or below x(i). The median is the 50th percentile.
Quartile:
The first quartile, denoted by Q1, is the 25th percentile
the third quartile, denoted by Q3, is the 75th percentile
The distance between the first and third quartiles is a measure of spread that gives the range covered by the middle half of the data. This distance is called the interquartile range (IQR):
IQR = Q3 - Q1

Five-number summary of distribution consists of:
Minimum, Q1, median, Q3, Maximum

Box Plot:




Outliers in a boxplot:

Tags: Technology,Machine Learning,Data Visualization,