Research study design is defined as a plan, protocol, strategy or scheme of a study. The studies are useful to find out the unidentified effects and things concerning the drugs and diseases. To solve the troubles regarding the drugs and diseases a suitable research study design should be selected. The choice of study is based on the purpose of the study. And well designed study will obviously recognize an exposure and an outcome. The research study designs are classified into two types, one as observational study, second as interventional and both studies further classified into different types. Observational studies will be completed in soon or quickly when compared with the interventional studies, but observational studies are useful only for to set the hypothesis whereas interventional studies useful to test hypothesis and to identify the causes. Apart from these two studies other studies like Nested hybrid study designs, different Randomized study designs are there to find out the answers for the particular questions regarding the drugs and diseases. Each study has their own advantages and disadvantages in terms of the money and time. However, understanding of the various studies is important.
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