Mathematical models are a way to attempt to predict the probable outcome of a complex situation. From climate, stock market and physics models, you can use mathematical formulas to determine a range ...

A seasonal index is a way of measuring the seasonal variation -- that is, to measure the change that is due to seasonal changes in demand -- of a variable, typically sales. For example, a beachfront ...

Here, we look at how to use data imported into Microsoft Excel ... variable results in a 3x change in the dependent variable, in the opposite direction. You can use linear regression to compare two or ...