- In quantitative data analysis, researchers are sometimes interested in the implications of non-interval level variables for a dependent variable , as for example in the case of the relationship between sex and income. Although regression analyses normally require data scaled at the interval-level, it is possible to include non-interval variables in a multiple regression by creating appropriate so-called dummy variables. In the example just cited, this would involve coding men as 1 and women as 0; or, where the independent variable comprises more than two (let us say n) categories, creating a dummy variable comprising n - 1 dummy variables. Thus, if the independent variable ‘social class’ contains the four categories ‘upper’, ‘middle’, ‘working’, and ‘none’, then in order to include these in a multiple regression analysis three dummy variables would have to be created: v1 ‘upper’ (coded 1) or ‘not upper’ (coded 0); v2 ‘middle’ (coded 1) or ‘not middle’ (coded 0); v3 ‘working’ (coded 1) or ‘not working’ (coded 0). The fourth category is represented by these three dummy variables since it can be described by the combination 000. Each category in the social class variable now has a unique combination of zeros or ones by means of which its presence or absence can be indicated. In a regression analysis involving dummy variables the resulting regression coefficients are then treated as if they were based on variables measured at the interval level. See also measurement.
Dictionary of sociology. 2013.
Look at other dictionaries:
dummy variable — dummy variables … Dictionary of sociology
Dummy variable (statistics) — In statistics and econometrics, particularly in regression analysis, a dummy variable (also known as an indicator variable) is one that takes the values 0 or 1 to indicate the absence or presence of some categorical effect that may be expected to … Wikipedia
Dummy — may refer to: Military dummy: dummy round a cartridge that is inert, i.e. contains neither primer nor gunpowder decoy fake military equipment intended to deceive the enemy Crash test dummy, a full scale replica of a human being, weighted and… … Wikipedia
Free variables and bound variables — In mathematics, and in other disciplines involving formal languages, including mathematical logic and computer science, a free variable is a notation that specifies places in an expression where substitution may take place. The idea is related to … Wikipedia
Переменные в исследованиях (variables in research) — Керлингер определяет П. как «символ, которому приписываются цифры или числовые значения». Это родовое определение, относящееся, в том числе, и к психол. П. в исслед., указывает на мат. основу. Иначе говоря, любая П., х или у, подразумевает… … Психологическая энциклопедия
Crash test dummy — For the band, see Crash Test Dummies. For the series of toys, see The Incredible Crash Dummies. 3 dimensional model of ATDs … Wikipedia
Crash test dummy — Saltar a navegación, búsqueda Los crash test dummies han permitido salvar innumerables vidas … Wikipedia Español
Errors-in-variables models — In statistics and econometrics, errors in variables models or measurement errors models are regression models that account for measurement errors in the independent variables. In contrast, standard regression models assume that those regressors… … Wikipedia
Mutually exclusive events — For the programming algorithms, see Mutual exclusion. In layman s terms, two events are mutually exclusive if they cannot occur at the same time. An example is tossing a coin once, which can result in either heads or tails, but not both. In the… … Wikipedia
statistics — /steuh tis tiks/, n. 1. (used with a sing. v.) the science that deals with the collection, classification, analysis, and interpretation of numerical facts or data, and that, by use of mathematical theories of probability, imposes order and… … Universalium