Non-Randomized Experiment
A Non-Randomized Experiment is an interventional experiment that does not use random allocation.
- Context:
- It can range from being an Observational Study to being a Non-Randomized Intervention Study.
- Example(s):
- Counter-Example(s):
- a Randomized Experiment, such as a Randomized Controlled Experiment.
- See: Cohort Study, Case-Control Study.
References
2013
- http://www.cochrane.org/glossary/5#lettern
- Non-randomised study: Any quantitative study estimating the effectiveness of an intervention (harm or benefit) that does not use randomisation to allocate units to comparison groups (including studies where ‘allocation’ occurs in the course of usual treatment decisions or peoples’ choices, i.e. studies usually called ‘observational’). To avoid ambiguity, the term should be substantiated using a description of the type of question being addressed. For example, a 'non-randomised intervention study' is typically a comparative study of an experimental intervention against some control intervention (or no intervention) that is not a randomised controlled trial. There are many possible types of non-randomised intervention study. including cohort studies, case-control studies, controlled before-and-after studies, interrupted-time-series studies and controlled trials that do not use appropriate randomisation strategies (sometimes called quasi-randomised studies).