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.
Cessna Citation Excel. The Cessna Citation Excel (Model 560XL) is a turbofan-powered, medium-sized business jet built by the Cessna Aircraft Company in Wichita, Kansas, United States. A member of the wide-ranging Citation brand of business jets, the Excel was evolved into the Citation XLS and then the Citation XLS+ models.