INTRODUCTION: A retrospective–prospective study focuses on past trends in a phenomenon and studies it into the future. A study where you measure the impact of an intervention without having a control group by ‘constructing’ a previous baseline from either respondents’ recall or secondary sources, then introducing the intervention to study its effect, is considered a retrospective–prospective study. In fact, most before-and-after studies, if carried out without having a control – where the baseline is constructed from the same population before introducing the intervention – will be classified as retrospective-prospective studies.
RETROSPECTIVE STUDY: A retrospective study investigates a phenomenon, situation, problem or issue that has happened in the past. Such studies are usually conducted either on the basis of the data available for that period or on the basis of respondents’ recall of the situation.
RELATED;
1. THE CROSS-SECTION STUDY DESIGN
2. THE EXPERIMENTAL STUDY DESIGN
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