The following article updates the diffusion index, recession slack index, aggregate recession model, and aggregate peak-trough model through April 2015. In January 2015, I created a new explanatory variable for a market-based indicator and I added another new explanatory variable in April 2015. The total total number of explanatory recession model variables is now 20. The current and historical data in this report reflect the current model configuration with all 20 variables.
In July 2014, two new explanatory variables were added to the Trader Edge Recession Models and one explanatory variable was replaced. The swapped variables measured similar economic data, but the new series had more predictive power and was more forward-looking. For more information on the changes in July 2014, please see "Two New Improvements to Trader Edge Recession Models."