diachronic study

lon·gi·tu·di·nal stud·y

a study of the natural course of life or disorder in which a cohort of subjects is serially observed over a period of time and no assumptions need be made about the stability of the system. Synonym(s): diachronic study

longitudinal study

An epidemiologic study that follows a population forward over time, evaluating the effects of one or more variables on a process. If individuals are followed, it is termed a longitudinal cohort study. If classes—e.g., age classes—are studied, it is a longitudinal cross-sectional study. Longitudinal studies are the converse of horizontal studies.

Examples
Cohort studies; case-control studies; Framingham Study in Massachusetts, US; Port Pirie study, an ongoing analysis of the long-term effects of blood lead levels on IQ.

di·a·chron·ic study

(dī-ă-kron'ik stŭd'ē) A study of the natural course of a life or disorder in which a cohort of subjects is serially observed over a period of time and no assumptions need be made about the stability of the system.

单词	diachronic study
释义	EncyclopediaSeelongitudinal study diachronic study lon·gi·tu·di·nal stud·y a study of the natural course of life or disorder in which a cohort of subjects is serially observed over a period of time and no assumptions need be made about the stability of the system. Synonym(s): diachronic study longitudinal study An epidemiologic study that follows a population forward over time, evaluating the effects of one or more variables on a process. If individuals are followed, it is termed a longitudinal cohort study. If classes—e.g., age classes—are studied, it is a longitudinal cross-sectional study. Longitudinal studies are the converse of horizontal studies. Examples Cohort studies; case-control studies; Framingham Study in Massachusetts, US; Port Pirie study, an ongoing analysis of the long-term effects of blood lead levels on IQ. di·a·chron·ic study (dī-ă-kron'ik stŭd'ē) A study of the natural course of a life or disorder in which a cohort of subjects is serially observed over a period of time and no assumptions need be made about the stability of the system.
随便看	national institute for youth sports administration national institute global econometric model national institute in church finance and administration national institute of accountants national institute of accountants, australia national institute of accounting technicians national institute of adult continuing education national institute of advanced industrial science and technology national institute of advanced management course national institute of advanced studies national institute of advanced technology national institute of aerospace national institute of agricultural biotechnology national institute of agricultural botany national institute of agricultural engineering national institute of agricultural marketing national institute of agricultural planning and projection national institute of agricultural sciences and technology national institute of agrobiological research national institute of agrobiological sciences national institute of allergies and infectious disease national institute of allergy and infectious disease national institute of allergy and infectious diseases national institute of amateur radio national institute of american history and democracy