PSY230H5 Lecture Notes - Lecture 9: Multiple Dispatch, Meta-Analysis, Longitudinal Study

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Published on 21 Oct 2016
School
Department
Course
Stability of Personality
Scientific Relevance:
Fundamental assumption of personality psychology- personality traits
are stable
Personal Relevance:
Will you still be the same person 10 years later?
How likely is it that people you care about will be the same, change or
improve?
Stability of Individual Differences
Assessed with retest correlations
Retest interval: time interval between two assessments of personality
(eg. One month, one year)
Stability: retest correlations over longer time periods (years)
True stability: retest correlations over longer time periods adjusted for
unreliability
Meta-analysis
o Meta-analysis: combines results of several original studies
o Original studies: assessed personality traits repeatedly over longer
time intervals (at least one year apart)
o Data in the meta-analysis: 3,217 correlation coefficients from 152
longitudinal studies of personality
Average Retest Correlations (6.5 years)
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Why Are Retest Correlations Not r=1.00?
Measurement error: reduces correlations even if personality has not
changed
Variability: temporary changes due to transient situational influences
(eg. Bad hair day)
Change: long-term changes in personality traits
More than two repeat assessments are needed to separate
measurement error and variability from change
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