Observational study | Wikipedia audio article
Channel: wikipedia tts
Date: 02/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Observational_study


00:00:41 1 Motivation
00:03:29 2 Types
00:04:13 3 Degree of usefulness and reliability
00:05:09 4 Bias and compensating methods
00:07:54 5 See also



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SUMMARY
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In fields such as epidemiology, social sciences, psychology  and statistics, an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns or logistical constraints. One common observational study is about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator. This is in contrast with experiments, such as randomized controlled trials, where each subject is randomly assigned to a treated group or a control group.