# Descriptive statistics

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Two aspects of single variables (univariate) should be graphed and described:

- Central tendency
- Shape and spread of the data distribution

The choice of which graphs and descriptive statistics to use depends on the level of measurement and whether the variable is normally distributed.

## Normally distributed variables[edit]

For normally distributed variables:

- Descriptive statistics:
- Central tendency: mean, median, mode
- Spread: standard deviation, skewness and kurtosis, range, inter-quartile range, percentiles, minimum and maximum.

- Graphs:

## Non-normally distributed variables[edit]

For non-normally distributed variables:

- Descriptive statistics:
- Central tendency: frequencies, percentages, mode
- Spread: range, inter-quartile range, percentiles, minimum and maximum

- Graphs: bar chart, pie chart

## See also[edit]

- Descriptives and graphing (Tutorial)
- Descriptives and graphing (Lecture)
- Graphing