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Psychology 124, Week 4 Notes

by: Layne Franklin

Psychology 124, Week 4 Notes PSY 124 - 03

Marketplace > University of Indianapolis > Psychlogy > PSY 124 - 03 > Psychology 124 Week 4 Notes
Layne Franklin
GPA 2.9

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About this Document

These notes cover material that might be on the exam.
Fndtns/Psyc Science I:Methods
Jordan Sparks Waldron
Class Notes
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This 2 page Class Notes was uploaded by Layne Franklin on Wednesday February 10, 2016. The Class Notes belongs to PSY 124 - 03 at University of Indianapolis taught by Jordan Sparks Waldron in Fall 2015. Since its upload, it has received 17 views. For similar materials see Fndtns/Psyc Science I:Methods in Psychlogy at University of Indianapolis.

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Date Created: 02/10/16
The Measurement of Behavior Part 1  Main principle of measurement- Variability in participants’ scores reflects variability in response Types of Scales  Scales of Measurement  Degree to which data reflect real numbers.  Type of Scale is defined by presence of these properties:  Identity: items that are different receive different scores  Magnitude: ordering of numbers reflects ordering of the variable  Equal Unit: difference of 1 is the same amount through the entire scale  Absolute Zero: assigning score of zero indicates absence of variable being measured Measurement Error  Observed Score  True Score + Measurement Error  True Score  Participant’s score if the measure was perfect.  Measurement Error  Variability in observed scores due to extraneous factors.  Total Variance in Observed Scores = Variance due to True Scores + Variance due to Measurement Error  Systematic Variance + Error Variance  Many different potential sources of error Reliability  Measurement error reduces reliability of a measure.  Reliability  How consistent or dependable is the measure?  The reliability of a measure is an inverse function of measurement error.  Reliability =  Variance in observed scores due to True Scores / Total Variance in observed scores Assessing Reliability  Correlation Coefficient  Expresses the strength of the relationship between two variables  Test-Retest Reliability  Consistency of participants’ responses on a measure over time.  Stable Characteristics.  Administer measure on two separate occasions.  Interrater Reliability  Consistency between two or more researchers who observe and code participants’ behaviors.  Procedure  Raters independently code behavior.  Examine the degree of agreement among raters.  We want observers to make similar ratings. Validity  Validity  The degree to which a measurement procedure actually measures what it is intended to measure rather than measuring something else.  Measures can be highly reliable but not valid.  A reliable clock tells us that it is 2pm every day at the same time.  A valid clock tells us that it is 2pm when it is actually 2pm.  What about vice versa? Reliability and Validity  When collecting information on behavior or psychological traits, researchers must consider both Reliability and Validity.


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