Child Development 133 (03, 04, 72, 73 & 74) Research Methods in Human Development
Hembree Spring, 2013
External and Ecological Validity
I. External Validity
A. Introduction
= ability to generalize your experimental results
B. Three types of generalization:
1. to the population of interest
2. to the environment of interest
3. to the time of interest
C. Threats to External Validity
1) threats based on methods
2) threats based on participants
D. Replication 1. Exact replication
D. Replication
1. Exact replication
2. Conceptual replication
E. Ecological Validity
F. What can we do to improve external and ecological validity?
II. Discussion Questions
Send problems, comments or suggestions to: hembrees@csus.edu
California State University, Sacramento College of Education
Department of Child Development
Updated: January 25, 2013
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