Quasi experiments and small n designs

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Presentation transcript:

Quasi experiments and small n designs

What is a quasi-experiment? No random assignment to groups BUT there is some “treatment” Vs. field experiment What is a quasi-experiment?

Examples of quasi-experiments Participant variables Things you can’t manipulate or control Things you may need to know quickly Examples of quasi-experiments

Effects on internal/external validity

Threats to internal validity History Maturation Testing Instrumentation Regression to the mean Selection Mortality Spontaneous remission Placebo effects Threats to internal validity

Using government definition of unemployed and it changes Testing diet program and people keep dropping out Some participants sign up for helping study in the morning, and others at night People in a diet program lose weight not because of the program per se but because they are monitoring their intake more Which are these?

One group pre-test post-test Threats to internal validity? Ways to address? One group pre-test post-test

Nonequivalent control group design Threats to internal validity? Ways to address? Matching Nonequivalent control group design

Interrupted time series design Threats to internal validity? Ways to address? Control series design Interrupted time series design

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