Longitudinal study - Wikipedia A longitudinal study (or longitudinal survey, or panel study) is a research design that involves repeated observations of the same variables (e g , people) over long periods of time (i e , uses longitudinal data)
Longitudinal - definition of longitudinal by The Free Dictionary 1 of or pertaining to longitude or length: longitudinal measurement 2 extending in the direction of the length of a thing; lengthwise 3 of or extending along the long axis of the body, or the direction from front to back, or head to tail
longitudinal - WordReference. com Dictionary of English of or pertaining to longitude or length: longitudinal measurement extending in the direction of the length of a thing; running lengthwise: a thin, longitudinal stripe Zoology pertaining to or extending along the long axis of the body, or the direction from front to back, or head to tail