Chapter 1

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  1. Method of Comparison
    Statisticians use methods of comparisons. They want to know the effect of a response of a treatment  (Vaccine) on a response (like getting herpes).
  2. Treatment Group vs Control Group
    • Treatment group gets treatment
    • Controlled get nothing¬†
    • Usually it is hard to compare the effect of a treatment without comparing it without something else
    • If treatment group improve against control group who didn't the response is likely due to the treatment
    • if treatment group is comparable to controlled group look for confounding factors
    • to make sure control group is like treatment investigators put subjects into treatment or controlled groups at random (randomized controlled experiments).
  3. Double Blind experiment
    • The subject do not know whether they are in the treatment or controlled group. Neither do they who evaluate the responses.
    • This guards against bias either in the response or in the evaluation

Card Set Information

Author:
damea134
ID:
306383
Filename:
Chapter 1
Updated:
2015-08-14 05:56:22
Tags:
Experiments
Folders:
Statistics
Description:
Controlled experiments
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