# Single Model Accuracy Estimation

I'm working on a model to estimate CDS prices, and want to backtest it against a historical timeseries. What are some error/goodness of fit measures that I can use for this purpose outside of RMSE?

I'm generally unfamiliar with this kind of metric, and in my research I've only found comparison measures, that yield a 'best' model relative to others, such as AIC and BIC. In this case I only have the one model, and want to produce some standalone measure of 'accuracy'.