10_UnivariateIntraVar_032410

10_UnivariateIntraVar_032410 - HDFS 597K Univariate...

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1 UNIVARIATE INTRAINDIVIDUAL VARIABILITY: HDFS 597K March 24, 2010 Net & Time-Structured J. Pol ock, Summertime: Number 9A, 1948 Univariate Intraindividual Variability Intraindividual Variability across time (context) – Univariate, multi-occasion Occasions Individual Variable Measurement/Modeling of … • Two avenues: (Fiske & Rice, 1955; Ram & Gerstorf, 2009) Net Intraindividual Variability • Quantity of variability or – “spontaneous variability” – those changes that do not spontaneous variability those changes that do not show any systematic trends over time (i.e., the ordering of occasions is immaterial) Time-Structured Intraindividual Variability • Characteristics of variability – “reactive or adaptive variability” – those changes that are ordered or organized in some fashion (e.g., cycles and oscillations) Dynamic Characteristics Dynamic Processes T: Activities that connect prior states to future states M: Models describing systematic time-dependency Net Intraindividual Variability Time-Structured Intraindividual Variability Capacities or potentials for change :T Measures describing the extent or range of behavior :M NET INTRAINDIVIDUAL VARIABILITY Net Intraindividual Variability Quantity of variability or • “spontaneous variability” – those changes that do not show any systematic trends over time (i.e., the ordering of occasions is immaterial) Measures of Dispersion: • Quantifying how many observations in the data are distributed across various categories? Intraindividual Standard Deviation (iSD), Range, Interquartile Range, Coefficient of Variation ( iCV ), Mean Square of Successive Difference ( iMSSD ), Entropy, etc.
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2 Intraindividual Standard Deviation (iSD) () 2 2 1 1 1 i T ii t i t Variance y y T σ = == 2 i iSD 2 i i Variance = ISD i = 2 ISD i = 4 Intraindividual Standard Deviation (iSD) 2 i iSD = = The AMIB Study Spring 2009 • Participants: – 184/190 undergraduate psychology students (66% , 87% 1 st /2 nd year) from Penn State University • Ethnicity: 84% Caucasian, 6% Asian, 4% Hispanic/Latino, 2% African American, 4% Mixed/Other 2% African American, 4% Mixed/Other – Age range: 18-54 years (M Age = 19.3; SD Age = 2.8; Median Age = 19) • Experience Sampling Design: – 1-week of reports on daily experiences and social interactions • Subset ( n = 30) invited to continue participation for an additional 2-weeks for monetary compensation ($72) IntraVar & InterDiffs Stress iMeans iResiduals IntraVar (Net) Stress (Net of iMean)
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3 Intraindividual Density Distributions (e.g., Fleeson, 2001) Note difference in Y axis Intraindividual Density Distributions Univariate Describing Distributions iMean iVariance iSkew iKurtosis Formal distributions normal, maximum value, minimum value, exponential, etc.
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10_UnivariateIntraVar_032410 - HDFS 597K Univariate...

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