# What Means Dataset?

**collection of data**

A **Data set** (or dataset) is a **collection of data**. In the case of tabular data, a **Data set** corresponds to one or more database tables, where every column of a table represents a particular variable, and each row corresponds to a given record of the **Data set** in question. The **Data set** lists values for each of the variables, such as height and weight of an object, for each member of the **Data set**. **Data set**s can also consist of a collection of documents or files.[1]

In the open data discipline, **Data set** is the unit to measure the information released in a public open data repository. The European Open Data portal aggregates more than half a million **Data set**s.[2] Some other issues (real-time data sources,[3] non-relational **Data set**s, etc.) increases the difficulty to reach a consensus about it.[3]

## Properties[edit]

Several characteristics define a **Data set**'s structure and properties. These include the number and types of the attributes or variables, and various statistical measures applicable to them, such as standard deviation and kurtosis.[4]

What rate of sexual abuse or rape images are acceptable in a billion scale multimodal dataset? At a 0.1% incidence rate, that means accepting a million images of minors being sexually assaulted within such datasets. 32/ https://t.co/VWw0RjkfmW

— Abeba Birhane (@SteamPoweredDM) Oct 06, 2021

The values may be numbers, such as real numbers or integers, for example representing a person's height in centimeters, but may also be nominal data (i.e., not consisting of numerical values), for example representing a person's ethnicity. More generally, values may be of any of the kinds described as a level of measurement. For each variable, the values are normally all of the same kind. However, there may also be missing values, which must be indicated in some way.

In statistics, **Data set**s usually come from actual observations obtained by sampling a statistical population, and each row corresponds to the observations on one element of that population. **Data set**s may further be generated by algorithms for the purpose of testing certain kinds of software. Some modern statistical analysis software such as SPSS still present their data in the classical **Data set** fashion. If data is missing or suspicious an imputation method may be used to complete a **Data set**.[5]

## Classic **Data set**s[edit]

Several classic **Data set**s have been used extensively in the statistical literature:

## See also[edit]

## References[edit]

## External links[edit]

Look up**Data set**in Wiktionary, the free dictionary.