CHFD 3710(f) - CHFD 3710 Longitudinal studies look at age...

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CHFD 3710 Longitudinal studies look at age cohorts or individuals over time The longitudinal design follows the same people over many years(at two-year intervals) Longitudinal studies pose practical problems. first,they take many years to complete A longitudinal study requires a number of tests or surveys. third,fewer grants exist for longitudinal studies than for cross-sectional studies Fourth, longitudinal studies lose members over time Time-lag comparison design, tries to overcome the problems raised by simple cross- sectional and simple longitudinal designs Like cross-sectional and longitudinal methods, the time-lag method also presents problems.it confounds cohort effects with environmental effects. If a research study finds that 70-year olds in 2005 visited doctors less often than 70 year olds did in 1985,this difference may be due to the better health of 70-year olds in 2005(a cohort effect) Complex methods like time-lag designs help sort out the effects of age, cohort,and period
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This note was uploaded on 02/20/2011 for the course CHFD 3710 taught by Professor Lewis during the Spring '11 term at University of Georgia Athens.

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CHFD 3710(f) - CHFD 3710 Longitudinal studies look at age...

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