monfils 418_Jan 23 2014

monfils 418_Jan 23 2014 - Sta$s$csandresearchdesign...

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Sta$s$cs and research design Threats to validity Prof. Marie MonFls
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Outline Reliability and validity Internal validity Threats to internal validity External validity
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Reliability and validity
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Reliability and validity Reliability: Consistency or stability of a measuring instrument Validity: A measure of the truthfulness of a measuring instrument.
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Validity A measure of the truthfulness of a measuring instrument . i.e., is our instrument measuring what we think it is measuring?
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Validity Internal External
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Internal validity—drawing inferences about rela$onships within the experiment! Degree to which the rela$onship between scores reflects only the intended rela$onship between variables An internally valid study is free from confounds – Other plausible causes of results have been ruled out Experiments are designed to answer ques$ons – Aim to look at the rela$onship between variables – Internally valid studies allow us to say something about this rela$onship.
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Threats to internal validity Factors other than the independent variable could afect the experimental outcome Solu$ons to this possible problem: try to minimize the presence o± these other ±actors i± they are unavoidable, try to spread their efects equivalently between groups Categories o± such ±actors have been iden$²ed
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monfils 418_Jan 23 2014 - Sta$s$csandresearchdesign...

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