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3 - Classification Diagnosis Research

3 - Classification Diagnosis Research - Diagnosis...

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Diagnosis & Classification, Research 22/01/2007 20:06:00 Research is a careful, methodical process whose purpose is to discover and  intperet facts, to revise accepted theories or laws in light of new facts, and to examine if  and how to apply new knowledge to existing theories. GOAL: to find out with a degree of certaininty that your findings are not due to  chance, but that there is a high statistical probability your findings are universal and  true. Research components o Hypothesis Develop a speficic question – what is it you want to know? What you think the answer is. Null hypothesis: there is no difference or relationship between  the variables you are studying. “Color has nothing to do with the number of dates” o Measurement of variables Select key variables and how to measure them Can you trust these measures to reflect your research question  and accurately reflect the answers? Validity: is it measuring what you are trying to study? Construct validity: measures reflects the construct one is  trying to study Concurrent validity: the measure shoul be able to tell  different groups apart when given to them at the same  time. Predictive validity: measure can accurately predict the  future occurrence of a related construct Convergent validity: measure provides the same  information as other measures that are studying the  same thing Discriminant validity: measures does not provide th same  information as another measure that is trying to study a  different construct.
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o Research design Cross-sectional vs. longitudinal Single-case study design Systematic introduction and withdrawal of experimental  condition(s) A-B-A-B A: intervention & B: no intervention Can tell a causal relationship
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