Tracking forecasting accuracy and error requires comparing your forecasts with different sources of information, such as historical data, benchmarks, or alternative models. This can help you identify patterns, trends, or gaps in your forecasting process and adjust your assumptions, methods, or inputs accordingly. Time series analysis involves plotting actual and forecasted values over time and analyzing the patterns, trends, cycles, seasonality, or anomalies in the data. Additionally, you can measure the correlation, causation, or significance of the relationship between the variables using statistical tests or methods. Forecast vs. actual analysis involves calculating the difference or error between actual and forecasted values for each period and analyzing the distribution, frequency, magnitude, or direction of the error. You can also use charts or graphs to visualize the error. Benchmarking involves comparing your forecasts with other sources of information such as industry averages, market data, competitor data, or expert opinions to validate, challenge, or refine your forecasts. Lastly, model comparison involves comparing your forecasts with alternative models such as different methods, techniques, or algorithms to test, evaluate, or optimize your model and select the best one for your data. By using one or more methods to compare your forecasts you can improve your forecasting accuracy and error.