Validity Validity of measurement Validity of research

Slides:

Advertisements

Similar presentations

Chapter 8: Construct and External Validity in Experimental Research

Advertisements

Validity (cont.)/Control RMS – October 7. Validity Experimental validity – the soundness of the experimental design – Not the same as measurement validity.

Validity of Quantitative Research Conclusions. Internal Validity External Validity Issues of Cause and Effect Issues of Generalizability Validity of Quantitative.

Inadequate Designs and Design Criteria

GROUP-LEVEL DESIGNS Chapter 9.

Chapter 8 Construct and External Validity in Experimental Research ♣ ♣ Construct Validity   External Validity   Cautions in Evaluating the External.

Slides to accompany Weathington, Cunningham & Pittenger (2010), Chapter 4: An Overview of Empirical Methods 1.

Experiment Basics: Variables Psych 231: Research Methods in Psychology.

Validity, Sampling & Experimental Control Psych 231: Research Methods in Psychology.

Validity, Sampling & Experimental Control Psych 231: Research Methods in Psychology.

Common Designs and Quality Issues in Quantitative Research Research Methods and Statistics.

Sampling and Experimental Control Goals of clinical research is to make generalizations beyond the individual studied to others with similar conditions.

Psych 231: Research Methods in Psychology

Variables cont. Psych 231: Research Methods in Psychology.

Psychology 242 Research Methods II Dr. David Allbritton

Sampling & Experimental Control Psych 231: Research Methods in Psychology.

Validity, Reliability, & Sampling

Construct Validity and Measurement

Validity Lecture Overview Overview of the concept Different types of validity Threats to validity and strategies for handling them Examples of validity.

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.

Chapter 8 Experimental Research

V ALIDITY IN Q UALITATIVE R ESEARCH. V ALIDITY How accurate are the conclusions you make based on your data analysis? A matter of degree Non-reification.

Understand how we can test and improve validity of a study The Pros and Cons of different sampling techniques.

12 Experimental Control and Internal Validity What are the potential threats to the validity of research? What is experimental control? What effect do.

Techniques of research control: -Extraneous variables (confounding) are: The variables which could have an unwanted effect on the dependent variable under.

Group Quantitative Designs First, let us consider how one chooses a design. There is no easy formula for choice of design. The choice of a design should.

The Basics of Experimentation Ch7 – Reliability and Validity.

Validity RMS – May 28, Measurement Reliability The extent to which a measurement gives results that are consistent.

CDIS 5400 Dr Brenda Louw 2010 Validity Issues in Research Design.

Experimental Design Experiment: A type of research study that tests the idea that one variable causes an effect on another variable.

1 Evaluating Research This lecture ties into chapter 17 of Terre Blanche We know the structure of research Understand designs We know the requirements.

STUDYING BEHAVIOR © 2009 The McGraw-Hill Companies, Inc.

Experiment Basics: Variables Psych 231: Research Methods in Psychology.

Northern Advanced Research Training Initiative Experimental Research Methods Nikos Bozionelos PhD

Review of Research Methods. Overview of the Research Process I. Develop a research question II. Develop a hypothesis III. Choose a research design IV.

Reading and Evaluating Research Method. Essential question to ask about the Method: “Is the operationalization of the hypothesis valid? Sections: Section.

 Descriptive Methods ◦ Observation ◦ Survey Research  Experimental Methods ◦ Independent Groups Designs ◦ Repeated Measures Designs ◦ Complex Designs.

Chapter 6 Research Validity. Research Validity: Truthfulness of inferences made from a research study.

Experimental Research Methods in Language Learning Chapter 5 Validity in Experimental Research.

Chapter 8 – Lecture 6. Hypothesis Question Initial Idea (0ften Vague) Initial ObservationsSearch Existing Lit. Statement of the problem Operational definition.

Experimental & Quasi-Experimental Designs Dr. Guerette.

SOCW 671: #6 Research Designs Review for 1 st Quiz.

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.

Experiments.  Labs (update and questions)  STATA Introduction  Intro to Experiments and Experimental Design 2.

Construct validity s.net/kb/consthre.htm.

Psychological Experimentation The Experimental Method: Discovering the Causes of Behavior Experiment: A controlled situation in which the researcher.

Validity Threats to Validity Threats to validity – definition Theory vs. measurement Types of validity – Conclusion validity – Internal validity – Construct.

Can you hear me now? Keeping threats to validity from muffling assessment messages Maureen Donohue-Smith, Ph.D., RN Elmira College.

Experimental and Quasi-Experimental Research

Approaches to social research Lerum

Research Design in Psychology

Experiment Basics: Variables

Experiments: Part 3.

Research Methods: Concepts and Connections First Edition

Chapter 6 Research Validity.

Experiments and Quasi-Experiments

How do we misinterpret? Common threats to validity

Hypothesis Testing, Validity &

Experiments and Quasi-Experiments

Experiment Basics: Variables

Experiments: Validity, Reliability and Other Design Considerations

Introduction to Experimental Design

Chapter 6 Research Validity.

Internal Validity - The extent to which all explanations for changes in the DV between conditions have been eliminated -- other than the IV. ie(7a)

Experiments II: Validity and Design Considerations

Experiments: Part 2.

Experiments: Part 3.

Experiments: Part 3.

Methodological Evaluation of Experiments

Presentation transcript:

Validity Validity of measurement Validity of research Does it measure what it is supposed to? Validity of research Does it prove what it is supposed to? (Does it support the conclusion that it is supposed to?)

Validity of Research Internal Validity Construct Validity Does the IV (and not some other factor) really cause the changes in the DV? Ruling out other causes (confounds) Construct Validity Does the study support the theory it is supposed to and no other theories? Ruling out other theories (alternative explanations) External Validity Do the results generalize to other people? Statistical Validity Does the IV cause the changes in the DV, or could they be due to chance?

The two kinds of Construct Validity Construct validity of measures Does it measure what it is supposed to and nothing else? Construct validity of research Does it support the theory it is supposed to and no other theories?

Threats to Validity Internal Validity: Confounds Construct Validity: Ambiguity External Validity: Uniqueness Statistical Validity: Insufficient Power* * and improper use of statistical techniques

Threats to Internal Validity: Confounds History Maturation Testing effects (e.g.: practice effects) Selection bias (in assigning to conditions) Mortality Regression to the mean

Threats to Construct Validity: Ambiguity Loose connection between theory and method (poor operational definition of theoretical concepts) Ambiguous effects of IVs If participants interpret the instructions differently than intended “Good subject” effects Evaluation apprehension

Threats to External Validity: Uniqueness External validity = generalizability Non-representative samples Changes over time “Ecological validity” – does the result transfer to the real world from the laboratory? The more unique the experimental situation and the sample, the less generalizable the results are likely to be

Threats to Statistical Validity: Insufficient Power Too small a sample size makes it harder to tell whether an effect is due to chance or not Other threats besides low power: There are many ways that the improper use of statistical techniques can lead to invalid conclusions.