Please include an example data set in your explanation. Again, Excel and MegaStat will do all the necessary calculations.
Excel 2003: Tools > Data Analysis > Correlation
Excel 2007: Data > Data Analysis > Correlation
MegaStat: Correlation/Regression > Correlation Matrix
Correlation of correlation is a fractional number between -1 and 1 which indicates the strength of relationship between the two variables. A negative coefficient of correlation ...
The concept of coefficient of correlation and coefficient of determination are described in the solution. An example data set is used in the explanation.