A value close to -1 indicates a negative linear correlation; that is, when one variable increases the other decreases. A value close to 0 indicates a non-linear, or random, correlation. The equation for calculating the correlation coefficient is where Xi and Yi are the set of variables, and the sample means.
A demographic is a subset of a population that shares a common factor such as age, income or education level. The Millennial generation, for example, is the demographic cohort that immediately follows Generation X. Although there is a great deal of variation from one individual to another within any generational cohort, the particular environment for any generation affects those individuals in ways that are observable as broad tendencies.
Demographics. Demographic market segmentation is one of the most common approaches to segmenting markets. With this strategy, a company simply divides the larger market into groups based on several defined traits. Age, race, gender, marital status, occupation, education and income are among the commonly considered demographics segmentation traits. As a simple example of usage, a company that sells feminine hygiene products will include female in its description of its primary market segment.