4 - measures

4 - measures - Fundamentals of Measurement 18:05...

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Fundamentals of Measurement 18:05 Measurement: The assignment of numbers to objects or events according to  specific rules  Conceptual variables: The ideas that form the basis of a research hypothesis Measured variables: Consist of numbers that represent the conceptual variables  Measures: The measured variables 
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Operational Definition 18:05 A precise statement of how a conceptual variable is turned into a measured  variable In some cases the conceptual variable may be too vague to be  operationalized, and in other cases the variable cannot be operationalized  because the appropriate technology has not yet been developed o The measured variables are very specific  More specific definitions mean that there is less danger that the  collected data will be misunderstood by others Specific definitions will enable future researchers to replicate the  research Converging Operations Multiple possible measures represent a great advantage to researchers  o No single operational definition of a given conceptual variable can be  considered the best  o The ability to use different operationalizations of the same conceptual  variable allows the research to hone in on the conceptual variable of  interest Conceptual and Measured Variables The ultimate goal of the research is to learn about the relationship between  the conceptual variables  o The ability to learn about this relationships is dependent on the operational  definitions  Nominal and Quantitative Variables Nominal variable: Used to name or identify a particular characteristic  o Frequently used in behavioral research to indicate the condition that a  person has been assigned to in an experimental research design  Nominal variables indicate the fact that people who share a value on the  variable are equivalent in some way  o Numbers are generally used to indicate the values of a nominal variable  Quantitative variable: Uses numbers to indicate the extent to which a person  possesses a characteristic of interest
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This note was uploaded on 11/16/2010 for the course PSYC 420 taught by Professor Staff during the Fall '08 term at Maryland.

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4 - measures - Fundamentals of Measurement 18:05...

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