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AT&T

Overview page. Subjects: Computing — Sport and Leisure.

American Telephone and Telegraph Company. From its origins in 1875 to 1984, AT&T ran the Bell System, the US telephone monopoly. In the computer industry, the company is best known for the...

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correspondence analysis

Overview page. Subjects: Mathematics — Sociology.

A method of multivariate analysis popular in France and developed by J. Benzecri. The purpose of the technique is to rearrange the rows and columns of a data matrix so that units and...

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dummy variable

Overview page. Subjects: Mathematics — Sociology.

Qualitative or categorical variables that are introduced into regression analysis to utilize information that cannot be measured on a numerical scale.

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multilevel models

Overview page. Subjects: Sociology — Probability and Statistics.

A multilevel model attempts to model all the components in a hierarchy of nested effects (see nested design). For example, the attitudes of schoolchildren, or the recovery rates of hospital...

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non-response

Overview page. Subjects: Probability and Statistics — Sociology.

A common problem for analysts of survey data. There are two types: complete non-response in which the individual selected for interview is absent, dead, or uncooperative; and item...

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oversampling

Overview page. Subjects: Probability and Statistics — Sociology.

The deliberate selection of individuals of a rare type in order to obtain reasonably precise estimates of the properties of this type. In a population which includes such a rare type, a...

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