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 distribution of establishment and (weighted) employee characteristics in the longitudinal sample is remarkably similar to the distribution of each characteristic within the cross-section of OES data as a whole.
gov/pubmed/27572145) studied the link between marijuana use and body mass index (BMI) 6 a weight-to-height ratio that's used as in indicator of obesity and underweight 6 in a nationally representative longitudinal sample.
These findings from a nationally representative, longitudinal sample were published in the Journal of Interpersonal Violence.
Job insecurity and self-esteem: evidence from cross-lagged relations in a 1-year longitudinal sample.
The children, who came from many different backgrounds, were given the measure many times in preschool, kindergarten, as well as into first grade, depending on which longitudinal sample they were in.
Contract award: longitudinal sample survey on school-work transitions.
Students in each of these groups were comparable in age and other characteristics to those in the Longitudinal sample who completed the second survey after two years of college.
The researchers used a longitudinal sample to assess "the accuracy of measures of verbal reasoning, quantitative reasoning, nonverbal reasoning, and current achievement for predicting later achievement.
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.

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