KIN232 Lecture Notes - Lecture 5: Randomized Controlled Trial, Design Of Experiments, Internal Validity
Document Summary
Experimental research: purpose: to determine/examine cause and effect, an effect seen (observed) in an observational study may be caused by confounding factors. Take a group that does exercise for weeks, measure bp throughout. Have a control group that stays sedentary, measure bp throughout. Not considered randomization: can randomize within blocks of a trait (sex, age, etc. ) Considered randomization: blocking involves categorically separating participants (e. g. by sex) and then randomizing the people within those categories. Placebo: participants are generally blinded to group assignment by administration of a placebo condition , definition. Ig = intervention group: o = observation, x = intervention, cg = control group. Pre/post: most basic design: pre/post evaluation, alternative include, post-only, repeated measures. Ig: rox/oo: cg: ro o o, there is an evaluation in the middle of the intervention, this gives us an idea of when our treatment starts to take effect. The control group"s observational values should look the same as the intervention group"s pre-evaluation.
