Читать книгу The Research Experience - Ann Sloan Devlin - Страница 132

History is one of those threats you can’t control. Events in the world that occur during the course of research (e.g., terrorism or illness) may impact respondents’ answers to your surveys or problem-solving skills, as examples. If your sample is large enough, events specific to individuals are likely to be randomly distributed across conditions. In the case of terrorism or some other event that affects the population, you may not be able to tell whether the event interacted with and differentially affected the responses of one group relative to another, especially if the sample size is small.

History: One of Campbell and Stanley’s (1963) threats to internal validity in which something happens between experimental treatments to influence the results.