What is the disadvantage of using an event partitioning design? (Select all that apply.)
a. It avoids complicated statistical analyses.
b. The validity of its results depends on the assumption the all persons in the study are similar.
c. It does not require as much time for data collection as does a longitudinal study.
d. It measures small increments of an intervention instead of the whole intervention.
e. It makes the assumption that a key event continues to occur in the same way.
ANS: C, E
A merger of the cross-sectional or longitudinal and trend designs, the event-partitioning design, is used in some cases to increase sample size and to avoid the effects of history on the validity of findings. Cook and Campbell referred to these as cohort designs with treatment partitioning. The term treatment is used loosely here to mean a key event that is thought to lead to change. In a descriptive study, the researcher would not cause or manipulate the key event but rather would clearly define it so that when it occurred naturally, it would be recognized. Data across subjects is assumed to be comparable, and a larger sample size would be available for later studies of changes over time.
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