A measure of income inequality, typically within a society

A measure of the level of segregation between two groups, typically within geographic areas

A measure of variation used for nominal-level or ordinal-level variables

The difference between the 25th and 75th percentiles

Ratio of the change in the graphic and the change in the data. Ideally, given that the two of these should be the same, it should be around 1

The sum of scores divided by the number of scores

The middle score in an ordered set of data for a variable

The score that appears most frequently in a set of data for a variable:

A case that has a value on a given variable that differs dramatically from other values on the variable

This Russian mathematician who figured out what proportion of cases fall one, two, and three standard deviations from the mean. Spelling it correctly not required!

A close relative of the median, this has a certain percentage of the cases above or below it.

The range in which one quarter of the cases in an ordered list of data fall

The difference between the highest and lowest values of a variable

The mathematical notation used to represent "add up all this series of numbers"

The shape of a distribution that is not symmetrical, with the tail on the left side, meaning that there are some extreme lower scores

The shape of a distribution that is not symmetrical, with the tail on the right side, meaning that there are some extreme higher scores

The square root of the variance. It is useful for telling how unique individual cases are in a set of data

A measure of variation for a ratio-level variable, it is the average squared deviation from the mean. It is useful for comparing the amounts of variation among various groups