Calculating correlation can be time-consuming but software like Excel makes it much easier. You can use several methods to calculate correlation in Excel.

The coefficient of determination is used in statistical analysis to assess how well a model explains and predicts future outcomes. It's more commonly known as r-squared.

Negative coefficients indicate opposite direction of movement in most cases. The other key result is the correlation of the two. Regression statistics will typically include an R-squared value.

Microsoft Excel, the widely used spreadsheet software, can be helpful for statistical analysis, with its built-in functions and free add-in tools.