longitudinal


Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

lon·gi·tu·di·nal

(lon'ji-tū'di-năl), [TA]
1. Running lengthwise; in the direction of the long axis of the body or any of its parts. Synonym(s): longitudinalis [TA]
2. Studied over a period of time, diachronic; contrast with cross-sectional or synchronic, which give equivalent results only under certain strict conditions of stability and equilibrium. Such strict attention to these conditions is of the greatest importance in the study of survivorship either in demographics or in cell economy (for example, survival pattern of erythrocytes and platelets).
[L. longitudo, length]

longitudinal

[lon′jəto̅o̅′dənəl]
Etymology: L, longitudo, length
1 pertaining to a measurement in the direction of the long axis of an object, body, or organ, such as the longitudinal arch of the foot.
2 pertaining to a scientific study (nonexperimental research design) that is conducted over a long period of time, such as the Framingham (Massachusetts) Study of heart disease, with data collected from study participants at more than one point in time. Compare cross-sectional.

lon·gi·tu·di·nal

(lon'ji-tū'di-năl) [TA]
1. Running lengthwise; in the direction of the long axis of the body or any of its parts.
2. Data studied over a period of time, diachronic; contrast with cross-sectional or synchronic, which give equivalent results only under certain strict conditions of stability and equilibrium.
[L. longitudo, length]

longitudinal

(lŏn″jĭ-tood′ĭ-năl, ĭ-tū′) [L. longitudo, length]
1. Parallel to the long axis of the body or part.
2. Continuing or lasting for some time. A longitudinal study follows its subjects from month to month or year to year
References in periodicals archive ?
Segundo Menard (2002), o delineamento longitudinal puro e considerado como a melhor estrategia nos estudos do crescimento, tendo em vista que as medidas dos mesmos sujeitos sao realizadas repetidamente em intervalos pre determinados.
Hence using the same phenomena over a period of time for longitudinal analysis can be a problem.
Many of the prospective studies described here paved the way for subsequent longitudinal investigations aimed at deepening our understanding of the onset and persistence of antisocial behavior.
Our research uniquely adds persistence to graduation as a longitudinal dependent variable.
For nearly 50 years, the disk drive industry has focused nearly exclusively on a method called longitudinal magnetic recording, in which the magnetization of each data bit is aligned horizontally in relation to the drive's spinning platter.
Grounded theory, as described by Glaser and Strauss (1967) and adapted for use in a social constructivist paradigm, served as the basis for data analysis for these findings and is being used in the longitudinal study.
Longitudinal research has been considered fundamental to understanding any organism's development (Uncles, 1988).
In an attempt to solve this problem, the Jacobsen team cobbled together data from the federal longitudinal "Prospects" study's Cohort 1 to measure children's test scores in 1st and 2nd grades (1992-93); Prospects Cohort 3 for scores in 3rd and 5th grades (1991-93); Prospects Cohort 7 for 7th and 9th grades (1991-93); and the National Education Longitudinal Study to measure 10th- and 12th-grade scores (1990-92).
Both helical and longitudinal serpentine recording media have a storage capacity and data transfer rate that is five to six times greater than that of longitudinal recording media.
In fact, there has been a fair amount of longitudinal aging research done.
Many studies have suggested that premature longitudinal cracking is caused primarily by improper construction or rehabilitation practices combined with heavy load repetitions.
The department awarded six grants each approximately $1 million to eligible State Workforce Agencies in Alabama, Indiana, Iowa, Kentucky, Massachusetts and Missouri for the development or enhancement of a state workforce longitudinal administrative database.