<P> 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 short or long periods of time ( i.e. , uses longitudinal data ) . It is often a type of observational study , although they can also be structured as longitudinal randomized experiments . </P>
<P> 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 short or long periods of time ( i.e. , uses longitudinal data ) . It is often a type of observational study , although they can also be structured as longitudinal randomized experiments . </P>
research that involves studying a single case in a long period of time is known as
research that involves studying a single case in a long period of time is known as
A longitudinal study ( or longitudinal survey , or panel study )
A longitudinal study ( or longitudinal survey , or panel study )