This article is about the general concept. For files on IBM mainframes, see Data set (IBM mainframe). For data communications, see Modem.
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 for example height and weight of an object, for each member of the data set. Data sets can also consist of a collection of documents or files.
In the open data discipline, data set is the unit to measure the information released in a public open data repository. The European data.europa.eu portal aggregates more than a million data sets.
Contents
1Properties
2Classics
3See also
4References
5External links
Propertiesedit
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.
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. Missing values may exist, which must be indicated somehow.
In statistics, data sets 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 sets 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.
Classicsedit
Several classic data sets have been used extensively in the statistical literature:
Iris flower data set – Multivariate data set introduced by Ronald Fisher (1936). Provided online by University of California-Irvine Machine Learning Repository.[6]
MNIST database – Images of handwritten digits commonly used to test classification, clustering, and image processing algorithms
Categorical data analysis – Data sets used in the book, An Introduction to Categorical Data Analysis, provided online by UCLA Advanced Research Computing.[7]
Robust statistics – Data sets used in Robust Regression and Outlier Detection (Rousseeuw and Leroy, 1968). Provided online at the University of Cologne.[8]
Time series – Data used in Chatfield's book, The Analysis of Time Series, are provided on-line by StatLib.[9]
Extreme values – Data used in the book, An Introduction to the Statistical Modeling of Extreme Values are a snapshot of the data as it was provided on-line by Stuart Coles, the book's author.
Bayesian Data Analysis – Data used in the book are provided on-line (archive link) by Andrew Gelman, one of the book's authors.
The Bupa liver data – Used in several papers in the machine learning (data mining) literature.
Anscombe's quartet – Small data set illustrating the importance of graphing the data to avoid statistical fallacies
See alsoedit
Data blending
Data (computing)
Data sample
Data store
Interoperability
Data collection system
List of data sets for machine-learning research
Dataset Tutorials:
A dataset is a collection of data, generally represented in tabular form, with columns signifying different variables and rows signify different members of the set
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