This is going to get a bit more technical than many of my other posts. However, I am a big believer that there is no reason to shy away from complexity, particularly when avoiding it sacrifices accuracy. So we are going to discuss forecast performance for sales tax in North Dakota. There are many different ways to evaluate forecasts and the one I will use here is called a tracking signal.
The legislative session is in high gear and on March 18th the OMB released what they are calling their March 2015 Revenue Forecast (found here). This is an updated revenue number for the legislators, and I think it comes as no surprise that some of the numbers were down, especially oil. Looking ahead to the 2015-17 biennium the forecast is for a decline in oil revenues by $869,745,374. That is on top of more than $100 million less in the remainder of the current biennium. Does this number seem plausible? Sure.