Elements of information, often numerical, that serve as a point of departure for a statistical study.

Statistical data can be numerical data or alphanumeric data.

**Raw data**are data that have not yet been sorted.- In a statistical distribution, an
**inconsistent element**is a value that differs significantly from the main group of data (or cluster). An inconsistent element is not representative of the set of data in the distribution. **Data analysis**is a branch of statistics that has been developed over many years thanks to advances in computer science. The methods aim to identify the parameters that are characteristic of a very large number of data collected, for example during statistical inquiries such as censuses and surveys of populations, or following the collection of meteorological data over a long period and a very large area.

### Example

- We asked 30 students in a class how many children there were in their families. The
**raw data**collected were: 2, 3, 1, 1, 2, 1, 4, 2, 3, 1, 2, 2, 3, 1, 1, 4, 20, 2, 1, 3, 2, 2 ,3, 1, 1, 2, 1, 2, 3, 3, 1. - In this set of raw data, the value 20 is an
**inconsistent datum**.