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.
1 plural : the statistical characteristics of human populations (as age or income) used especially to identify markets a change in the state's demographics. 2 business : a market or segment of the population identified by demographics trying to reach a younger demographic.