Univariate
Analysis  Numerical 
Statistics 
Visualization 
Equation 
Description 
Count 
Histogram 
N 
The number of values
(observations) of the variable. 
Minimum 
Box Plot 
Min

The smallest value of
the variable.

Maximum 
Box Plot 
Max

The largest value of the
variable.

Mean 
Box Plot 

The sum of the
values divided by the count.

Median 
Box Plot 

The middle value. Below and above
median lies an equal number of values.

Mode 
Histogram 

The most frequent value.
There can be more than one mode.

Quantile 
Box Plot 

A set of 'cut points'
that divide a set of data into groups containing equal numbers of
values (Quartile, Quintile, Percentile, ...).

Range 
Box Plot 
MaxMin

The difference between maximum and
minimum. 
Variance 
Histogram 

A measure of data dispersion. 
Standard
Deviation 
Histogram 

The square root of variance. 
Coefficient of
Deviation 
Histogram 

A measure of data dispersion divided by
mean. 
Skewness 
Histogram 

A measure of symmetry or asymmetry in the distribution
of data. 
Kurtosis 
Histogram 

A measure of whether the data are peaked or flat relative to a normal distribution. 