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Types of Measure

Central Tendency tells you about the centers of the data. Useful measures include the mean (Weighted Mean, Harmonic Mean, Geometrical Mean), median, and mode (Mode, Multimode).
• Harmonic Mean is the reciprocal of the arithmetic mean of the reciprocals.
$\frac{n}{\sum_i^n(\frac{1}{x{i}})}$
, where
$i=1,2,...n$
and
$n$
is the number of items in the dataset
$x$
.
• Geometric Mean is the n-th root of the product of all
$n$
elements
$x_i$
in a dataset
$x$
.
$\sqrt[n]{\prod_i^n x_{i}}$
, where
$i=1,2,...n$
and
$n$
is the number of items in the dataset
$x$
.
Variability tells you about the spread of the data. Useful measures include variance, Standard deviation, Skewness, Percentile, and Range.
Correlation or Joint Variability tells you about the relation between a pair of variables in a dataset. Useful measures include covariance and the correlation coefficient.