HSS 3101 Lecture Notes - Lecture 27: Internal Validity, Randomized Controlled Trial, Random Assignment

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 3101
• Professor: Jason Steffener

Document Summary

Testing prior measurement of the dependent variable may affect subsequent measurements: use of the same cognitive exam, learning effects. Instrumentation reliability of instrument that assesses the dependent variable or controls the independent variable may change over the study: popularization of the moca after mr. trump took it. Regression to the mean those with extreme scores tend to have scores closer to the mean on a second measurement; Mortality/attrition differential attrition from study between intervention and control groups: people may not like/enjoy" the intervention and drop out. Interactions of the causal relationship with settings the extent to which the study results can be generalized from the study"s set of conditions to other settings: again, think arizona vs minnesota. Rct traditional randomized controlled trial with individuals as the unit of ra; Could increase external validity establishing causation validity and understanding of process by because randomization creates probabilistically equivalent treatment and control groups leading to high internal validity.