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.
A cross-sectional study may be purely descriptive and used to assess the frequency and distribution of a particular disease in a defined population. For example a random sample of schools across London may be used to assess the burden or prevalence of asthma among 12-14 year olds. 1  Analytical. cross-sectional study should be representative of whole the population, if generalisations from the findings are to have any validity. For example a study of the prevalence of diabetes among women aged 40-60 years in Town A should comprise a random sample of all women aged 40-60 years in that town.