Handbook of Descriptive Statistics/Measures of Central Tendency/Mode

Modes are the most common values in a data set.

Example: Of the data set

1, 2, 3, 4, 4, 4, 5, 6

4 is the mode because there are three responses of "4" and only one response for 1, 2, 3, 5, or 6.

Data can have more than one mode, example:

Of the data set

1, 2, 2, 3, 4, 5, 5, 6.

2 and 5 are the modes because they are equally the most frequent.

Histograms can often be a good way to see if large data sets have more than one mode.