longitudinal study


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Related to longitudinal study: Panel study, sequential study

longitudinal study

[‚län·jə‚tüd·ən·əl ′stəd·ē]
(psychology)
The study of a group of individuals at regular intervals over a relatively long period of time.

longitudinal study

an investigation which involves making observations of the same group at sequential time intervals. Thus, a longitudinal study of a COHORT of children may be made to assess, for example, the effect of social class on school achievement (see BIRTH COHORT STUDY). Longitudinal studies are used by the National Children's Bureau to document various aspects of children's development in the UK. However, longitudinal studies are not only appropriate for studying human development or change, they may also be used to observe change over time within organizations.

The advantage of longitudinal studies compared with CROSS-SECTIONAL STUDIES is that the causal factor involved in a sequence of changes an be directly explored using data collected before and after changes (e.g. analysis of the effect of changes in the school curriculum). The main disadvantages are the greater expense of repeated study, the possible HAWTHORNE EFFECT of repeated studies and the influence of other changes which may be occurring concurrently (e.g. changes in the school curriculum may take place at the same time as changes in the resourcing of educational services). Compare PANEL STUDY.

References in periodicals archive ?
The longitudinal study focuses on the early detection of early cognitive impairment with emphasis on the early detection of the early stages of Alzheimer's disease.
The OECD s Longitudinal Study of Social and Emotional Skills in Cities aims at:
Journal Articles: Student use of mobile devices in course evaluation: A longitudinal study.
He is currently involved in a longitudinal study of ethnic differences in bone mass in children and the factors influencing bone growth and acquisition during puberty.
The Baltimore Longitudinal Study of Aging was started in 1958 by the National Institute on Aging to track various health factors in thousands of men and women.
The investigators used data from the Uppsala Longitudinal Study of Adult Men, a cohort of men who were born during 1920-1924.
1) Researchers used data from the National Longitudinal Study of Adolescent Health (Add Health) to compare psychological measures between teenage mothers and childless teenagers, and data from the Early Childhood Longitudinal Study-Birth Cohort (ECLS-B) to compare teenage and older mothers; both nationally representative data sets showed differences in the expected directions.
The finding comes from the Early Childhood Longitudinal Study-Birth Cohort, a longitudinal study of a nationally representative sample of children born in 2001.
Foster children: a longitudinal study of placements and family relationships'
National Children's Study is the largest longitudinal study of children's health ever planned.
WASHINGTON -- A second follow-up is in the works at the National Center for Education Statistics for the 2004-09 Beginning Postsecondary Students Longitudinal Study.

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