as epidemiology, social sciences, psychology and statistics, an observational study draws inferences from a sample to a population where the independent...

presence Naturalistic observation Observation unit Observational astronomy Observational error Observational learning Observational study Observable quantity...

A case–control study (also known as case–referent study) is a type of observational study in which two existing groups differing in outcome are identified...

manipulation has modified the values of the measurements. In contrast, an observational study does not involve experimental manipulation. Two main statistical...

postmenopausal women. It consisted of three clinical trials (CT) and an observational study (OS). In particular, randomized controlled trials were designed and...

the observational method can exert varying amounts of control over the environment in which the observation takes place. This makes observational research...

an observational science to be valid, the experimenter must know and account for confounding factors. In these situations, observational studies have...

often a type of observational study, although it can also be structured as longitudinal randomized experiment. Longitudinal studies are often used in...

Clinical study design is the formulation of trials and experiments, as well as observational studies in medical, clinical and other types of research...

Experiment Field of study Observational study Scientific study Research Study skills, abilities and approaches applied to learning Study (art), a drawing...