Statistics - (Data|Data Set) (Summary|Description) - Descriptive Statistics

Summary are a single value summarizing a array of data.

They are:

• selected
• or calculated through reduction operations.

They are an important element of descriptive analysis

One of the most important tools for summarizing data is to display it visually. See the Anscombe's quartet to understand why ?

From a summary, you can make an inference on a individual without looking at the distribution

Same as: Function - (Aggregate | Aggregation)

statistic

In order to summarize a set of data, we want to use one single number or value to describe where it is centred.

This single value can be calculated through one of the following (statistic|measure) of center:

• the mean,
• the median,
• and the mode

Another important element of a data set is how it is spread.

Measures of spread:

• range,
• inter-quartile range,
• standard deviation
• variance

• count (sample size)
• minimum
• maximum
• sum
• frequency
• bin (??)
• histogram
• skew
• Statistics - Kurtosis (Distribution Tail extremity)
• Five-number_summary
• Cryptography - Hash

Apache Math Package specifically DescriptiveStatistics