Lecture 6 - Control

Lecture 6 - Control - Control Control TwoDefinitions: I....

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    Control
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    Control Two Definitions: I. Control group II. Control of extraneous (confounding  variables)
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    I.  Control Groups No treatment. Baseline. Single blind. Double blind. Placebo (testing drugs or therapies). Sham (animal surgeries).
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    II. Control of Confounding  Variables A. Goals 1.  produce groups that are equivalent  prior to manipulation of IV – this  controls confounds 2.  reduce effects of nuisance  variables
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    II. Cont. B. Basic Control Techniques 1.  Randomization – random  assignment to groups in an expt. – each  p has an equal chance of being  assigned to any group - never completely sure of which  variables are being controlled 
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    II. Cont. 1. Elimination – confounding variables  are completely removed - have to know the confounding or  nuisance variable
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    II. Cont.
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This note was uploaded on 02/17/2011 for the course PYSC 226 taught by Professor Levens during the Fall '09 term at South Carolina.

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Lecture 6 - Control - Control Control TwoDefinitions: I....

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