The Reference Period is One of the Most Common Research Resign Types.

Retrospective
The purpose of retrospective research is to look at a past event, occurrence, or scenario. A retrospective project topics may only collect data in one of two ways: the investigator collects information from written sources such as books, magazines, newspapers, diaries, and other personal records, or he interviews people who remember the scenario. If the incident occurred decades or years ago, the investigator will have to depend on written documentation.


Prospective

The prospective study design entails looking at the long-term effects of a phenomenon, situation, programme, attitude, or problem. Most prospective research designs are also classified as experimental studies since the investigator's purpose is to observe the effects of a programme or event on the target population. Prospective studies, unlike retrospective research, use field or laboratory trials to analyse data after they have been collected. The conclusions drawn as a result of these study findings can then be extended to future events.

Review

Retrospective-prospective studies look back and forward at something that happened in the past. There is no control group in these investigations, unlike before-and-after research. The bulk of non-control before-and-after studies are retrospective-prospective accounting  research topics. In a retrospective-prospective study, the investigator collects data on the population before the intervention or treatment is implemented, and then studies the same group after the intervention or treatment has taken effect. The study did not include a baseline analysis or a control group.

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