L vs C-S outline

L vs C-S outline - with testing-- not age. 3. L confounds...

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5. Longitudinal (L) vs. Cross-Sectional (C-S) Studies 2 ways to study age-related changes (effects of getting older) Getting older involves: biological maturation more experiences
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Goal of L & C-S: separate effects of getting older from other factors (e.g., cohort effects, societal changes)
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(C-S): At one point in time, compare diff. groups that differ in age. 2010 5-yrs. 7-yrs. 9-yrs.
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(L): Examine one group at diff. times 2010 2012 2014 5 yrs. 7 yrs. 9 yrs.
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A. Dis advantages of L 1. L takes more time, which leads to: drop out: can lead to small, biased sample 2. Repeated Testing w/ L : Kids may improve (or decline) due to familiarity
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Unformatted text preview: with testing-- not age. 3. L confounds chronological age (CA) & year of testing (yr reflects societal condition). Does obesity increase as kids age? 2000 2005 2010 5 yrs. 10 yrs 15 yrs. Increases could be due to: 1. CA 2. Society getting more obese. B. Dis adv. of C-S Ex: Are kids who are the most aggress at 5 yrs. the same kids who are most aggress at 10? 1. C-S gives no info on how individuals change as they age. 2. C-S has cohort effects: a. Groups differ in two respects: 1. CA 2. cohort b. Implications: If you find diffs. between groups, dont know if due to CA or cohort....
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L vs C-S outline - with testing-- not age. 3. L confounds...

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