HLTB15H3 Lecture 9: Experimental/Non Experimental Design
Document Summary
Hierarchy - rct gold standard - for cause and effect (everything else is non experimental) Key characteristics - hypothesis/sampling - 2 arms - intervention/treatment. Control - in rct intervention is the only difference for control. Effect size - clinical difference is needed of at least vo2 50. Fear of occurrence vo2 levels - this is an association- not causation. So afraid will exercise more - more o2 released. Not afraid - won"t exercise - less vo2. If you don"t randomize, it doesn"t have validity. Need control group + randomization for cause and effect!! If more appopriate in studies of depression / anxiety and other stuff. Time series is better than pre and post testing because it only tests no. But time series helps see differences - low depression - longitudinal effect of the drug. Modify a bit socio cultural issue - financial issues. Once a drug is appopriate and becomes available to.
