longitudinal study

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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 study is the first to examine predictors of hookah use in a national longitudinal sample of young adults and it is being released at the same time as the U.
Contract award: longitudinal sample survey on school-work transitions.
s work by examining whether gender similarities in math performance would be replicated in a national, longitudinal sample of students and whether gender similarities in math performance would be moderated (i.
The researchers looked at data on earnings and life satisfaction from seven years of the British Household Panel Survey (BHPS), which is a representative longitudinal sample of British households.
This study combines results of a cross-sectional sample in Year 1 and a longitudinal sample in Year 2.
The longitudinal sample consisted of approximately 430 grade 1 students in immersion programs in four sites in Texas and California from 16 schools.
Khwaja uses microdata on a longitudinal sample of individuals from the Health and Retirement Study and conducts a computer- simulated thought experiment comparing the trends and outcomes under the status quo to a world without Medicare.
First, the regression model is respecified and two alternative specifications are examined: a nonparametric model for the age term and a random-effects model to capture the longitudinal sample dependence in the NLSY79.
In the next to the last section, the production model is estimated on a much larger longitudinal sample (state data), which allows for more variation in the benefits replacement rate, the key independent variable of interest in the analysis.
Combining the 12 matched sets into a single panel created a longitudinal sample of more than 32,000 jobseekers in 1991.
This article will attempt to fill this void in the economic damages literature by examining a longitudinal sample of workers whose earnings are available from 1968 through 1983.
The DoD serum repository, with its sheer sample size and longitudinal sample collection from health to disease onset and beyond, is a unique resource to understand the natural history of Crohn's disease and UC," said Joseph A.

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