1. A method for determining an appropriate parameter order for an energy use model for a building site, the method comprising: receiving an energy use model for a building site, the energy use model comprising a weather-related predictor variable; obtaining a plurality of data points, each of the data points comprising a value of the weather-related predictor variable and an associated energy consumption value for the building site; calculating a first regression statistic indicating a fit of the energy use model to the plurality of data points under a null hypothesis and a second regression statistic indicating a fit of the energy use model to the plurality of data points under an alternative hypothesis; comparing a test statistic to a threshold value, wherein the test statistic is a function of the first regression statistic and the second regression statistic; and determining an appropriate parameter order for the energy use model based on a result of the comparison.