Longest-running dramatic series of any genre. Longest-running daytime drama. *While its television debut was on June 30, 1952, The Guiding Light's first incarnation was as a radio show, which premiered on January 25, 1937. 55 years.
The benefit of a cross-sectional study design is that it allows researchers to compare many different variables at the same time. We could, for example, look at age, gender, income and educational level in relation to walking and cholesterol levels, with little or no additional cost. longitudinal study, like a cross-sectional one, is observational. So, once again, researchers do not interfere with their subjects. However, in a longitudinal study, researchers conduct several observations of the same subjects over a period of time, sometimes lasting many years.
cross-sectional group means may be a very poor description of the actual course of growth seen in. any given child.â In fact, an estimate of a growth curve from repeated cross-sectional data is. unbiased only when we assume that the growth function is linear (Willett, 1988).