NURS 311 Lecture Notes - Lecture 7: Stratified Sampling, Dependent And Independent Variables
15 Feb 2020
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Randomization/allocation: when individuals are randomly placed into experimental and control groups to prevent bias. Experimental group (eg): treatment given to a small group first to test efficacy and safety. Control group (cg): no treatment, non-experimental treatment, delayed treatment or placebo. Treatment/independent variable: causes health outcome because who actually gets it varies in purpose. Pretest-posttest: measure dependent variable before an after an intervention. Cross-over: randomly assign people in an experimental group (n=20) to receive treatment at varying times. Blinding : no one knows which group participant is part of the experimental or control group. Effect size: dependent variable mean in eg-dv mean in control group. Control group: no treatment, from a different setting to try and make up for the lack of randomization quicker and cheaper than rct no viable comparison sets less generalizable always a competing explanation. Non-equivalent control group : measuring the dependent variable before the intervention in experimental and control group, and measure dependent variable after.
