Psychology 124, Week 4 Notes
Psychology 124, Week 4 Notes PSY 124 - 03
Popular in Fndtns/Psyc Science I:Methods
Popular in Psychlogy
PSY 124 - 03
verified elite notetaker
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.
Reviews for Psychology 124, Week 4 Notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
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.
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'