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9 Cards in this Set

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  • Back
Three Experimental Designs
1. Completely Randoized Design
2. Randomized Block Design
3. Matched Pairs Design
Completely Randomized Design
1.All three principles of good experimental design are used (see lesson 25)
2.In order to choose groups for individuals we take an SRS.
3. See diagram on pg 204 or 203 for explanation.
group of individuals that are similar in a characteristic that will influence the response in treatments.
Note: Blocks used only with experiments and strata are used with surveys.
Note2: Blocks are another form of control-they control effects of a variable that defines the blocks.
Note3: Often equal in number to the treatments.
Completely Randomized Design
Randomly assign subjects tot the treatments within each block.
Matched Pairs
Special case of RBD and is with pairs.
Three Principles Of Experiments for Matched Pairs.
1. Randomly Assign Treatments
2. Repliction equals pairs
3. Compare two treatments--each pair serves its own control.
When is CRD ok?
When individuals are similar.
When is RBD ok?
When individuals are similar in one block but diff from block to block.
Benefits of RBD over CRD
1. There can be confounding in CRD when all objects are different
2.RBD removes condounding removes chance variation
4.detection of statistically significant results is easier