Course:Machine Learning for Humans/Foundations/Find the center
It is often desirable to find the center of a group of objects or
observations. There are several ways to find a 'statistical' center, each
with strengths and weaknesses.
Mean
The Mean, commonly called 'average', looks at for the center as a
measurement of how spread out the group members are and where most members
reside. It is subject to bias from the most far reaching members of the
group, known as outliers. Despite the strong influence of outliers, the
Mean is a very common way to find the center of a group, or distribution.
Median
Median is a way to find the center by dividing the set of observations
exactly in half. It doesn't matter how many of each value there are, just
that there are an equal number of observations on each side.
Mode
Mode considers the center as the value that is seen most frequently. In
other words, the Mode is the value observed with the highest count.