Week 2 Experimental designs

Information about Week 2 Experimental designs

Published on January 22, 2008

Author: physioactive

Source: authorstream.com

Content

Experimental Designs:  Experimental Designs Chee-Wee Tan P1112 Different Types of Methods:  Different Types of Methods Research designs are like house blue-prints Designs: Observational Quasi-experimental Experimental Observational Method:  Observational Method Obviously, observing! Example: Back pain observation Disadvantages: Long periods of observation No cause-effect information Terminology:  Terminology 2 types of variables: Independent Dependent Experimental Designs:  Experimental Designs Cause & Effect Difference between experimental & quasi-experimental? Experimental Controlled manipulation of independent variable Quasi-experimental Incomplete control of independent variable Quasi-experimental design:  Quasi-experimental design Issues in quasi-experimental design Handwashing example Problems with experimental design In some cases, ethical or practical considerations Quasi-experimental Provides alternative Types of quasi-experimental design:  Types of quasi-experimental design One group post-test design One group pre-test/post-test design Interrupted time series design One group post-test design Types of quasi-experimental design:  Types of quasi-experimental design Experimental designs:  Experimental designs 2 types of experimental designs Between groups / independent measures Repeated measures / within subjects ??? Randomisation:  Randomisation Placing participants randomly into the groups Purpose: prevent our own bias in influencing allocation Do stats and prosper! I love stats Between group designs:  Between group designs Different groups of participants for different conditions Advantages: Simple Practice and fatigue not a problem Between group designs:  Between group designs Disadvantages: More tedious Less sensitive to detect any experimental effects Examples of between group designs:  Examples of between group designs Post-test only / control group design Pre-test / post-test control group Repeated Measures:  Repeated Measures Participants allocated to all conditions Advantages: More economical More sensitive in detecting effects Disadvantages: ‘Carry over’ effect Intervention must be reversible More designs:  More designs Multiple levels of the independent variable designs Multi-factorial designs Latin square designs Multivariate designs Single-subject experimental designs Why are research designs important?:  Why are research designs important? Exclude unknown factors Makes it easier for interpretation A warrior knows his research designs as intimately as his own weapon……..Grrrrrr Me!

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