The Trend Projection with Regression Solver focuses exclusively on trend analysis. Its graph gives a big-picture view of how well the model fits the actual demand. Its sliders allow you to control when the regression begins, how many periods are included in the regression analysis, and how many periods you want forecasted into the future. The Time Series Forecasting Solver, on the other hand, covers all time series models, including the trend projection with regression. It also computes a combination forecast, which we cover in a subsequent section on using multiple techniques.