12 Quasi-Experiments And Small-N Designs Flashcards
Multiple-baseline design
A small-N design in which researchers stagger their introduction of an intervention across a variety of contexts, times, or situations.
Interrupted time-series design
A quasi-experiment in which people are measured repeatedly on a dependent variable before, during, and after the “interruption” caused by some event.
Non-equivalent control group design
A quasi-experiment with two or more groups in which (1) participants have been randomly assigned to groups; (2) participants are measured repeatedly on a dependent variable before, during, and after the “interruption” caused by some events; and (3) the presence or timing of the interrupting event differs among the groups.
Quasi-experiment
A study that is similar to an experiment except that the researchers do not have full experimental control (they may not be able to randomly assign participants to the independent variable conditions).
Reversal design
A study in which a researcher observes a problem behavior both before and during treatment and then discontinues the treatment for a while to see if the problem behavior returns.
Selection-history threat
A threat to internal validity in which a historical or seasonal events systematically affects only the subjects in the treatment group or only those in the comparison group – not both.
Single-N design
Study in which researchers gather information from only one animal or one person.
Small-N design
Study in which researchers gather information from just a few cases.
Stable-baseline design
A study in which the researcher observes behavior for an extended baseline. Before beginning of treatment or other intervention; if behavior during the baseline is stable, the researcher is more certain of the treatment’s effectiveness.
