While scatterplots provide a visual assessment of the relationship between variables, the correlation coefficient offers a numerical measure of the strength and direction of a linear relationship. The ...

Scatter controls let you specify three categories of variables: axes variables. For a scatter plot, at least two axes variables are required : one independent (x) and one dependent (y). For a surface ...

Simply collecting data is not enough. You can fill spreadsheets with data, but it's useless if you can't act on it. Regression is one of the most powerful statistical tools for finding relationships ...