A study design with only one independent factor (e.g. category) of treatment in which the factor is manipulated at multiple levels. Often used in experimental design to determine the effect of a certain treatment or intervention.
May be contrasted with factorial design, which evaluates the effects of two or more factors simultaneously.
Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.
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