In statistics, a covariate is a variable that is possibly predictive of the outcome under study. A covariate may be of direct interest or it may be a confounding or interacting variable. The alternative terms explanatory variable, independent variable, or predictor, are used in a regression analysis. In econometrics, the term `control variable` .....
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http://en.wikipedia.org/wiki/Covariate
A secondary variable that influences the outcome of an experiment.
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http://www.encyclo.co.uk/local/20429
A covariate is an independent situation, which is free to vary. In a correlation you plot two situations or co-variates off against each other. An example of this would be the number of hours spent studying for an exam by a group of let's say 20 students, and their eventual examination mark.
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http://www.gerardkeegan.co.uk/glossary/gloss_a.htm
A product of the correlation of two related variables times their standard deviations. Used in true experiments to measure the difference of treatment between them.
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https://writing.colostate.edu/guides/guide.cfm?guideid=90
A product of the correlation of two related variables times their standard deviations. Used in true experiments to measure the difference of treatment between them.
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https://writing.colostate.edu/teaching_guides.cfm
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