Quasi-experiments

May 21, 2013

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Psychology 242, Dr. McKirnan. Week 12-13, quasi-experimental designs.. True v. quasi-experimental designs. Psychology 242, Dr. McKirnan. Research Ethics. Quasi-experiments: naturally occurring events. Studying naturally occurring eventsMeasurement studiesRetrospective designs. Evaluate existing groups or programSingle shot survey or measureNon-equivalent groupsTime series designs.

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Quasi-experiments

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Lecture 8: Quasi-experiments

Lecture 8: Quasi-experiments. Aims & Objectives To differentiate between true and quasi-experiments To discuss the nature of random allocation To examine threats to experimental validity To examine some basic quasi-experimental designs. Type of general approaches to design. Descriptive

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Lecture 19: Program Evaluation and Quasi-Experiments

Lecture 19: Program Evaluation and Quasi-Experiments. Correlation and Causality. Fact 1: Correlation does not imply causality . Fact 2: Causality implies correlation .

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Valuing Impacts from Observed Behavior: Experiments and Quasi Experiments

Twelve. Valuing Impacts from Observed Behavior: Experiments and Quasi Experiments. Figure 12-1 Social Surplus Change Resulting from an Induced Wage Increase. Figure 12-2 Social Surplus Change Due to an Induced Increase in Hours Worked. Figure 12-3 Social Surplus Change Due to Workfare.

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QUASI-EXPERIMENTS

QUASI-EXPERIMENTS. Prepared by : Mohammed Salahat Supervised by Dr. Aidah Abu Elsoud Alkaissi Linkoping University-Sweden An-Najah National University- Palestine. Quasi-experiments. Quasi-experiments, like true experiments, involve:

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Chapter 3 Experiments, Quasi-Experiments, and Field Observations

Chapter 3 Experiments, Quasi-Experiments, and Field Observations. Winston Jackson and Norine Verberg Methods: Doing Social Research, 4e. The Rationale of the Experiment. John Stuart Mill — Method of Difference — the experiment is the key tool for discerning causal relations

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QUASI-EXPERIMENTS

QUASI-EXPERIMENTS. What is a Quasi-Experiment?. Compare subjects in different conditions on a DV Lacks one or more criteria for an experiment (cause, comparison, control) Interpreted like a correlational study . Why Do Quasi-Experiments?.

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Experiments and Quasi-Experiments

Experiments and Quasi-Experiments. (significance of group differences). Overview. Up to this point we have been discussing the relationships amongst variables where the same subject answers multiple questions

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Experiments and Quasi-Experiments

Experiments and Quasi-Experiments. Overview. Correlation v. Causation Three Criteria for causation How to craft manipulations. Correlation v. Causation. Depressed Mood. Cause?. Impaired Sleep. Depressed Mood. Impaired Sleep. Cause?. Depressed Mood. Impaired Sleep. Cause?. Cause?.

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Experiments and Quasi Experiments

Experiments and Quasi Experiments. Profesor Alexander Settles. Types of Experiments. There are four kinds of experiments: True experiments Quasi-experiments Natural experiments Naturalistic experiments. True Experiments.

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Quasi-experiments

Quasi-experimental designs Experimental designs for “studies in nature”. Quasi-experiments. Naturally occurring events / case studies. Single group interventions. Experiments with non -equivalent groups. Time series designs. Quasi-experiments: Existing groups. .

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Quasi-experiments (not quite experiments)

Quasi-experiments (not quite experiments). Definition: Experiments lacking random assignment of subjects to treatment conditions and the absence of an independent variable manipulated by the experimenter (e.g., automobile deindividuation study). Confounded Variables.

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Experiments and Quasi-Experiments

Experiments and Quasi-Experiments. Idealized Experiments and Causal Effects Estimation Internal Validity External Validity Regression Estimators Using Experimental Data The Tennessee Class Size Experiment Quasi-Experiments Threats to Quasi-Experiments Average Treatment Effect OLS

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Quasi-Experiments

Quasi-Experiments. Research Objective. Study relationships among variables for existing groups. Show direct cause & effect. Explain outcomes after the fact. Type of Design. Cross-Sectional Longitudinal. True Experiment Quasi-Experiment. Explanatory Case Study Exploratory Case Study.

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Field and Quasi-experiments

Field and Quasi-experiments. Review of main effects/interactions sheets. Field experiments. NOT quasi-experiments NJ Negative Income Tax Experiment ( hsty ) What are potential problems with field experiments ? How can these be encouraged? Evidence-based practice Rubin’s causal model.

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QUASI-EXPERIMENTS

QUASI-EXPERIMENTS. Compare subjects in different conditions on a DV Lacks one or more criteria for an experiment (cause, comparison, control) Interpreted like a correlational study . Why Do Quasi-Experiments?. Internal validity is a problem because the IV is not manipulated

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Experiments and Quasi-Experiments

Experiments and Quasi-Experiments. Josh Lerner Empirical Methods in Corporate Finance. The problem. Corporate finance has not traditionally carefully thought about: Reverse causation. Impact of unobserved third factors. Even when acknowledge, often responses are inadequate:

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sources of bias in experiments and quasi-experiments

sources of bias in experiments and quasi-experiments. sean f. reardon stanford university 11 december, 2006. three populations. population of interest (POI) : the population for whom we would like to estimate the average treatment effect

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Experiments and Quasi-Experiments

1. Experiments and Quasi-Experiments. 2. Introduction. Experiment : using a controlled situation to observe a result Involves taking and observing action Great for hypothesis-testing Theory-full. 3. The Classical Experiment. Involves three major pairs of components:

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Childhood Obesity Scenario: Quasi-Experiments and Natural Experiments Versus RCTs

Childhood Obesity Scenario: Quasi-Experiments and Natural Experiments Versus RCTs. Steven Gortmaker, Ph.D. Harvard School of Public Health /Harvard Prevention Research Center. Definitions.

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Quasi Experiments Non-Experimental Research

Quasi Experiments Non-Experimental Research. Research Methods & Statistics Fall 2011. Quasi Experiments. “Research procedure in which the scientist must select subjects for different conditions from preexisting groups” Research Methods, McBurney & White

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Quasi Experiments Non-Experimental Research

Quasi Experiments Non-Experimental Research. Research Methods & Statistics Summer 2014. Quasi Experiments. “ Research procedure in which the scientist must select subjects for different conditions from preexisting groups ” Research Methods, McBurney & White

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Quasi-Experiments – Outline

Quasi-Experiments – Outline. True Experiments Characteristics Threats to validity controlled by experiments Threats not controlled by experiments Obstacles to true experiments in the field Quasi-experiments The logic of quasi-experiments Non-equivalent control group design

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