Operational Definitions

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Information about Operational Definitions
Education

Published on September 4, 2008

Author: headlessprofessor

Source: authorstream.com

Headlessprofessor presents : Headlessprofessor presents Operational definitions Objective : Objective Describe the logic of science Purpose of Science : Purpose of Science Understand Purpose of Science : Purpose of Science Understand Predict Purpose of Science : Purpose of Science Understand Predict Control Logic of science : Logic of science The operational definition of a variable is how it is measured (or manipulated, controlled, or randomized) : The operational definition of a variable is how it is measured (or manipulated, controlled, or randomized) Synthetic, descriptive statements : Synthetic, descriptive statements Require that every variable be anchored to something empirically measurable Theology is not empirical : Theology is not empirical Claims about God, salvation & afterlife cannot be resolved with telescopes, microscopes or DNA labs Each variable must be handled in one of these ways : Each variable must be handled in one of these ways Measurement Manipulation Control (make it a constant) Randomization assumed Variables can be measured : Variables can be measured Dependent variables must be measured Independent variables can be measured or handled in other ways Variables can be measured : Variables can be measured Classification: male/female Other classifications : Other classifications Before / after Experimental / control Pass / fail Choice A / Choice B / Choice C Variables can be measured : Variables can be measured Classification: male/female Ordering: excellent, good, fair, poor Likert Scale : Likert Scale Totally agree Mostly agree Neutral / don’t know Mostly disagree Totally disagree Truth scale : Truth scale Definitely Probably Possibly No way ! Descriptive scale : Descriptive scale Extremely Very Somewhat Slightly Not at all Frequency scale : Frequency scale Always Usually Sometimes Rarely Never Variables can be measured : Variables can be measured Classification: male/female Ordering: excellent, good, fair, poor Enumeration: age; score on a test Measurement should be precise : Measurement should be precise Variables can be manipulated : Variables can be manipulated Intentionally making subjects different on a variable Variables can be manipulated : Variables can be manipulated Intentionally making subjects different on a variable Can be done via random assignment grouping, and then treat differently Variables can be manipulated : Variables can be manipulated Intentionally making subjects different on a variable Can be done via random assignment grouping, and then treat differently Essential feature of an Experiment Variables can be held constant : Variables can be held constant Exclusive sampling Variables can be held constant : Variables can be held constant Exclusive sampling, or Proportionate assignment to groups Variables can be randomized : Variables can be randomized Requires large sample Variables can be randomized : Variables can be randomized Requires large sample Requires random assignment to groups Variables can be randomized : Variables can be randomized Requires large sample Requires random assignment to groups Can only be assumed, never attained In good scientific research : In good scientific research it is clear how each and every variable was dealt with. Headlessprofessor presents : Headlessprofessor presents Operational definitions

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