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.
exists and is an alternate of . Excel is a spreadsheet developed by Microsoft but is by no means the first spreadsheet. The very first spreadsheet was developed (or invented) by Dan Bricklin and Bob Frankston called VisiCalc. VisiCalc was a spreadsheet written to operate on the Apple II computer and was released in 1979. The program was sold to Lotus who developed Lotus 123 from the VisiCalc principle. Lotus 123 was released in 1983.