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.
1. Microsoftâs first Office application was Excel. Originally released under the name Multiplan in 1982, Microsoft changed the name to Excel when releasing it for the Macintosh in 1985. 2. There never was an Excel 1.0 for DOS or Windows. Since Excel was initially launched on the Macintosh, its first release for Windows in 1987 was already version 2.0. 3. For compatibility reasons with Lotus 1-2-3, Microsoft wrongfully set the years 1900, 2100, and 2200 as leap years. This decision would come back to haunt them in the wake of the year 2000.