HSS 3101 Lecture Notes - Lecture 28: Internal Validity, Dependent And Independent Variables, Statistical Power
24 Nov 2018
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Add control or testing feasibility of an group: has many threats to internal comparison group intervention validity: selection, history, (nonrandomized) pp maturation, testing, and dependent variable design with control or instrumentation comparison group can. Limited external validity for other account for secular units, settings, variations in trends treatment, outcome measures. Only expect one test to be affected by the intervention. Test students pre/post on math tests and english tests: the math skills is not expected to affect english skills. Add control group examination of trends before, concurrent historical trends during, and after intervention without control group. Add non- equivalent dependent providing a precise picture of pre- can lead to identification of variables and post-intervention through spurious effect [your mri. Remove taking advantage of order and patterns both observed and expected over time needs major upgrades treatment at during the study] Can closely assess effect size, composition of sample speed, and maintenance over time changes at intervention.
