The direction of a correlation is either positive or negative. In a negative correlation, the variables move in inverse, or opposite, directions. In other words, as one variable increases, the other variable decreases. For example, there is a negative correlation between self-esteem and depression. In other words, the higher your self-esteem, the lower your feelings of depression.
Excel Communications was founded in 1988 by Dallas entrepreneur Kenny Troutt as a long distance reseller in the US telecom sector at the birth of telecom deregulation.
Allen, who co-founded Microsoft with Bill Gates in the mid-1970s, was that company's chief technologist until he left the company in 1983, the year he was treated for Hodgkin's lymphoma, according to the Web site for his Paul G. Allen Family Foundations.