Data | Charts
New: Box Plot
A Box Plot (also known as a box-and-whisker plot) is a classical tool used in Descriptive Statistics to analyze the distributions of numerical variables.
- the First Quartile Q1
- the Median Q2
- the Last Quartile Q3
- the Minimum, i.e. the lowest datum still within 1.5 of the Interquartile Range (IQR = Q3 − Q1) of the first quartile
- the Maximum, i.e. the highest datum still within 1.5 IQR of the last quartile
- the first Notch, , where N is the number of observations
- the last Notch, . Notches are useful in offering a rough guide to significance of difference of medians.
- the Mean
- Lower Suspect values that are within the Minimum and
- Upper Suspect values that are within the Maximum and
- Lower Extreme values that are inferior to
- Upper Extreme values that are superior to