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Lecture 5

PSYB01H3 Lecture Notes - Lecture 5: Quasi, Observational Error, Covariance

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Anna Nagy

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PSYB01 LEC 4 Measurement Concepts
- Chapter 1 to chapter 5 don’t worry about the interview sections
- Introduction of the Tri-Council policy
- In class lecture
- Library lab
- Next week during class
- Review:
o Non-experimental group
Quasi not all control variable
- Talk about assignment 2
- Hand in assignment 1
Assignment 2
- Read studies about the topic of interest
- Create an original study of the topic of interest
- Find and create a research question
Reliability of Measures
- Consistency or Stability of a Measure of Behavior
- True Score
- Measurement Error
- Pearson Product-Moment Correlation Coefficient
True Score
- Score on reading comprehension test = 70
- T(ex)
o T = true score
o e = error
o X = measure
- True score
o Ask the participant their background, to make sure there is no big
difference that affect the data
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Factor that affects the performance/test
o Train your RA
o Third one - double check everything
o Make sure you are considering the error, and error ability and fix your
o Use multiple measure
Theory of reliability
- Repeatability/consistency of a measure
- Same result over and over
- Every scores there is a true score + any sort of error in the measure
o Minimize the error
- Proportion of true scores in a measure
- But characteristic of a measure taken across individuals
- Look at variance in scores across subjects
Variance of true scores T
Variance of the measure X
- Don’t know true scores, so can’t calculate reliability of true scores… must
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