External Validity. The External Validity Question Theory CauseconstructEffectconstruct What you think Cause-effect construct.

Slides:



Advertisements
Similar presentations
McGraw-Hill/Irwin © 2003 The McGraw-Hill Companies, Inc.,All Rights Reserved. Part Three SOURCES AND COLLECTION OF DATA.
Advertisements

Stat 155, Section 2, Last Time Producing Data How to Sample? –History of Presidential Election Polls Random Sampling Designed Experiments –Treatments &
AP Statistics Chapter 13 Experiments & Observational Studies *Please download power point from wiki* Reminder: Unit III Team Assessment (Chapters 11 through.
Validity of Quantitative Research Conclusions. Internal Validity External Validity Issues of Cause and Effect Issues of Generalizability Validity of Quantitative.
GROUP-LEVEL DESIGNS Chapter 9.
Research Methods in MIS: Experimentation Dr. Deepak Khazanchi Acknowledgment: Some of the information in this presentation is Based on Cooper and Schindler.
Statistics Micro Mini Threats to Your Experiment!
Chapter 7 Conducting & Reading Research Baumgartner et al Chapter 8 Experimental Research.
Hypotheses & Research Design
Sampling and Experimental Control Goals of clinical research is to make generalizations beyond the individual studied to others with similar conditions.
Chapter 5 Designing Valid Communication Research.
Chapter 2 Research Process Part 1: Aug 29, Research Methods Importance of scientific method Research Process – develop ideas, refine ideas, test.
Psychology 242 Research Methods II Dr. David Allbritton
Lecture 4: Experiment 2011, 9, 15. How many pairs of shoes do you have in your closet?  Population mean:  Sample 1 mean:  Sample 2 mean:  Sample 3.
1 Exploring Quasi-experiments Lab Assignment #5 Due May 16, 2008 Locate an empirical journal article that employs a quasi-experimental design. Closely.
The Idea of Construct Validity. Construct Validity Theory Observation CauseConstructEffectConstruct ProgramObservations What you do What you see What.
S AMPLING AND E XTERNAL V ALIDITY KNR 164. P OPULATIONS AND S AMPLES Census: all obtainable persons Population: The entire group about which information.
EVAL 6970: Experimental and Quasi- Experimental Designs Dr. Chris L. S. Coryn Dr. Anne Cullen Spring 2012.
Experimental Research
Case Study Designs. Research Objective Show direct cause & effect Study relationships among variables for existing groups Explain outcomes after the fact.
Experimental Design 264a Marketing Research. Criteria for Establishing a Causal Relationship Concomitant variation Temporal variation Control over other.
EVALUATING YOUR RESEARCH DESIGN EDRS 5305 EDUCATIONAL RESEARCH & STATISTICS.
Experimental Research Take some action and observe its effects Take some action and observe its effects Extension of natural science to social science.
2.4. Design in quantitative research Karl Popper’s notion of falsification and science – If a theory is testable and incompatible with possible empirical.
RMK Chapter 1: Research Foundations
9/7/2015 Research Methods for Counselors COUN 597 University of Saint Joseph Class # 2 Copyright © 2015 by R. Halstead. All rights reserved.
Power Point Slides by Ronald J. Shope in collaboration with John W. Creswell Chapter 11 Experimental Designs.
 Internal Validity  Construct Validity  External Validity * In the context of a research study, i.e., not measurement validity.
KNR295 Sampling Slide 1 Sampling & External Validity Chapter 2.
The Scientific Method in Psychology.  Descriptive Studies: naturalistic observations; case studies. Individuals observed in their environment.  Correlational.
Copyright © 2008 Wolters Kluwer Health | Lippincott Williams & Wilkins Chapter 11 Enhancing Rigor in Quantitative Research.
Chapter 14 Cooper and Schindler
By: Valerie Passalacqua Alana Goldstein Gloren Brown.
Experimental Design Experiment: A type of research study that tests the idea that one variable causes an effect on another variable.
Research methods and statistics.  Internal validity is concerned about the causal-effect relationship in a study ◦ Can observed changes be attributed.
Research in Communicative Disorders1 Research Design & Measurement Considerations (chap 3) Group Research Design Single Subject Design External Validity.
Review of Research Methods. Overview of the Research Process I. Develop a research question II. Develop a hypothesis III. Choose a research design IV.
Modeling Political Phenomena Using Control Variables and Gauging Validity.
Learning Objectives In this chapter you will learn about the elements of the research process some basic research designs program evaluation the justification.
Introduction to Validity. What is Validity? l The best available approximation to the truth or falsity of a given inference, proposition, or conclusion.
INTRODUCTION TO STATISTICS. Anthony J Greene2 Lecture Outline I.The Idea of Science II.Experimental Designs A.Variables 1.Independent Variables 2.Dependent.
Establishing a Cause-Effect Relationship. Internal Validity What you did and what you sawWhat you did and what you saw Your program and your observationsYour.
Experimental & Quasi-Experimental Designs Dr. Guerette.
Introduction to Validity True Experiment – searching for causality What effect does the I.V. have on the D.V. Correlation Design – searching for an association.
EXPERIMENTAL RESEARCH KEY CONCEPTS,COMMON ERRORS, CONFUSIONS 2006.
Quantitative and Mixed Research Designs V. Darleen Opfer.
McGraw-Hill/Irwin Business Research Methods, 10eCopyright © 2008 by The McGraw-Hill Companies, Inc. All Rights Reserved. Chapter 10 Experiments.
Construct validity s.net/kb/consthre.htm.
SECTION 1: CONDUCTING RESEARCH THE STEPS OF SCIENTIFIC RESEARCH.
Relabeling Validity. Some History Campbell & Stanley.
Sampling l External Validity External Validity l Sampling Terminology Sampling Terminology l Probability in Sampling Probability in Sampling l Probability.
Validity Threats to Validity Threats to validity – definition Theory vs. measurement Types of validity – Conclusion validity – Internal validity – Construct.
AP Statistics Review Day 2 Chapter 5. AP Exam Producing Data accounts for 10%-15% of the material covered on the AP Exam. “Data must be collected according.
Conclusion validity Threats to conclusion validity Power Decision matrix explained Mr. Robert Becker -- The decision matrix in action, “The O.J. Simpson.
Introduction to Hypothesis Test – Part 2
Causation & Experimental Design
Types of Research Designs
Observational Study vs. Experimental Design
Part Three SOURCES AND COLLECTION OF DATA
Ron Sterr Kim Sims Heather Cruz aka “The Carpool”
Review of Research Types
Goal of Psychology: to determine the Underlying “laws” of behavior.
Goal of Psychology: to determine the Underlying “laws” of behavior.
Types of Control I. Measurement Control II. Statistical Control
Experiments: Validity, Reliability and Other Design Considerations
Experiments II: Validity and Design Considerations
External Validity.
Experiments: Part 2.
Misc Internal Validity Scenarios External Validity Construct Validity
Representative sampling By Majed Muati. Sampling Methods Representative Samples. Random Sampling. Systematic Sampling.
Presentation transcript:

External Validity

The External Validity Question Theory CauseconstructEffectconstruct What you think Cause-effect construct

The External Validity Question Theory CauseconstructEffectconstruct Cause-effect construct Observation ProgramObservations What you do What you see Program-outcome relationship Observation ProgramObservations What you do What you see Program-outcome relationship Observation ProgramObservations What you do What you see Program-outcome relationship Observation ProgramObservations What you do What you see program-outcome relationship Can we generalize to other persons, places, OR times?

How Do We Generalize? Model I: Sampling Population Specified persons, places, and times

How Do We Generalize? Model I: Sampling Population Sample Drawsample Drawsample

Population Sample GeneraLizeback Generalizeback

How Do We Generalize? Model II: Proximal Similarity OurStudy

OurStudy TimesPeople Places Settings

OurStudy TimesPeople Places Settings Lesssimilar Lesssimilar Lesssimilar Lesssimilar

OurStudy TimesPeople Places Settings Lesssimilar Lesssimilar Lesssimilar Lesssimilar Gradients of similarity

Threats to External Validity Maybe it is just these people. Maybe it is just these places. Maybe it is just these times. Interaction of selection and treatment Interaction of setting and treatment Interaction of history and treatment

How Can We Improve External Validity?

Population Sample Random sampling

How Can We Improve External Validity? Population Sample OurStudy People Places Times Random sampling Replicate, Replicate, Replicate

How Can We Improve External Validity? Population Sample OurStudy People Places Times OurStudy timespeople places settings Random Sampling Replicate, Replicate, Replicate Use theory

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.