Difference between revisions of "Quasi-Experimental or Non-Experimental Designs"
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= Overview = | = Overview = | ||
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| + | '''Quasi-Experiment: '''A quasi-experimental design is an empirical study, almost like an [[Experimental_Design|experimental design]] but without random assignment. Quasi-experimental designs typically allow the researcher to control the assignment to the treatment condition, but using some criterion other than random assignment (e.g., an eligibility cutoff mark). In some cases, the researcher may have control over assignment to treatment condition.<ref>Wikipedia: http://en.wikipedia.org/wiki/Quasi-experiment</ref> | ||
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| + | '''Non-Experiment: '''the researcher cannot control, manipulate or alter the predictor variable or subjects, but instead, relies on interpretation, observation or interactions to come to a conclusion. Typically, this means the non-experimental researcher must rely on correlations, surveys or case studies, and cannot demonstrate a true cause-and-effect relationship. Non-experimental research tends to have a high level of external validity, meaning it can be generalized to a larger population.<ref name="Education Portal: http://education-portal.com/academy/lesson/non-experimental-and-experimental-research-differences-advantages-disadvantages.html#lesson">Education Portal: http://education-portal.com/academy/lesson/non-experimental-and-experimental-research-differences-advantages-disadvantages.html#lesson | ||
| + | </ref> | ||
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= <span style="line-height: 20.390625px">Matching Methods or Constructed Controls</span> = | = <span style="line-height: 20.390625px">Matching Methods or Constructed Controls</span> = | ||
| − | Matching methods or constructed controls, in which one tries to pick an ideal comparison that matches the treatment group from a larger survey. The most widely used type of matching is propensity score matching, in which the comparison group is matched to the treatment group on the basis of a set of observed characteristics or by using the “propensity score” (predicted probability of participation given observed characteristics); the closer the propensity score, the better the match. | + | Matching methods or constructed controls, in which one tries to pick an ideal comparison that matches the treatment group from a larger survey. The most widely used type of matching is propensity score matching, in which the comparison group is matched to the treatment group on the basis of a set of observed characteristics or by using the “propensity score” (predicted probability of participation given observed characteristics); the closer the propensity score, the better the match. A good comparison group comes from the same economic environment and was administered the same questionnaire by similarly trained interviewers as the treatment group.<ref name="Worldbank - http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2000/08/19/000094946_00080705302127/Rendered/INDEX/multi_page.txtfckLR">Worldbank - http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2000/08/19/000094946_00080705302127/Rendered/INDEX/multi_page.txtfckLR</ref><br/> |
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= Instrumental Varialbles or Statistical Control Methods = | = Instrumental Varialbles or Statistical Control Methods = | ||
| − | + | Instrumental variables or statistical control methods, in which one uses one or more variables that matter to participation but not to outcomes given participation. This identifies the exogenous variation in outcomes attributable to the program, recognizing that its placement is not random but purposive. The “instrumental variables” are first used to predict program participation; then one sees how the outcome indicator varies with the predicted values.<ref name="Worldbank - http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2000/08/19/000094946_00080705302127/Rendered/INDEX/multi_page.txtfckLR">Worldbank - http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2000/08/19/000094946_00080705302127/Rendered/INDEX/multi_page.txtfckLR</ref><br/> | |
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= Further Information = | = Further Information = | ||
| − | *[[ | + | *[[Experimental Design|Experimental Design]] |
| + | *[http://www.socialresearchmethods.net/kb/destypes.php Social Research Methods: Types of Designs] | ||
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[[Category:Impacts]] | [[Category:Impacts]] | ||
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Revision as of 16:32, 6 October 2014
Overview
Quasi-Experiment: A quasi-experimental design is an empirical study, almost like an experimental design but without random assignment. Quasi-experimental designs typically allow the researcher to control the assignment to the treatment condition, but using some criterion other than random assignment (e.g., an eligibility cutoff mark). In some cases, the researcher may have control over assignment to treatment condition.[1]
Non-Experiment: the researcher cannot control, manipulate or alter the predictor variable or subjects, but instead, relies on interpretation, observation or interactions to come to a conclusion. Typically, this means the non-experimental researcher must rely on correlations, surveys or case studies, and cannot demonstrate a true cause-and-effect relationship. Non-experimental research tends to have a high level of external validity, meaning it can be generalized to a larger population.[2]
Matching Methods or Constructed Controls
Matching methods or constructed controls, in which one tries to pick an ideal comparison that matches the treatment group from a larger survey. The most widely used type of matching is propensity score matching, in which the comparison group is matched to the treatment group on the basis of a set of observed characteristics or by using the “propensity score” (predicted probability of participation given observed characteristics); the closer the propensity score, the better the match. A good comparison group comes from the same economic environment and was administered the same questionnaire by similarly trained interviewers as the treatment group.[3]
Instrumental Varialbles or Statistical Control Methods
Instrumental variables or statistical control methods, in which one uses one or more variables that matter to participation but not to outcomes given participation. This identifies the exogenous variation in outcomes attributable to the program, recognizing that its placement is not random but purposive. The “instrumental variables” are first used to predict program participation; then one sees how the outcome indicator varies with the predicted values.[3]
Reflexive Comparisons
Reflexive comparisons, in which a baseline survey of participants is done before the intervention and a follow-up survey is done after. The baseline provides the comparison group, and impact is measured by the change in outcome indicators before and after the intervention.[3]
Further Information
References
- ↑ Wikipedia: http://en.wikipedia.org/wiki/Quasi-experiment
- ↑ Education Portal: http://education-portal.com/academy/lesson/non-experimental-and-experimental-research-differences-advantages-disadvantages.html#lesson
- ↑ 3.0 3.1 3.2 Worldbank - http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2000/08/19/000094946_00080705302127/Rendered/INDEX/multi_page.txtfckLR
