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Quasi-Experimental Research
Research that resembles true experimental designs but lacks certain criteria, particularly manipulation and control.
Quasi-independent variables
Non-manipulated variables that differentiate groups, such as gender or age.
Nonequivalent Groups Design
A design comparing groups formed under conditions that do not allow for random assignment, often leading to assignment bias.
Pretest-Posttest Design
A design that measures a dependent variable before and after a treatment to assess changes over time.
IV
Abbreviation for independent variable, which can refer to both independent and quasi-independent variables in research.
Validity threats in Quasi-Experimental Designs
Factors such as history, instrumentation, testing effects, maturation, and regression that can confound results.
Interrupted Time-Series Design
A design involving multiple measurements over time to assess the impact of a treatment or event.
Combination Designs
Designs that integrate elements of both nonequivalent groups and pretest-posttest designs for comprehensive analysis.