Default Valid Model Requirements

Valid Overall Model Requirements:

  • Requires 1 valid model for each included energy source (see next section)

Valid Energy Source Model Requirements:

  • An F test for the overall model fit must have a p-value less than 0.10 (i.e., the overall fit is statistically significant at the 10% significance level). For a 12 month data set:
    If the model includes: The F-stat value must be
    greater than this F-critical value:
    1 variable 3.2850
    2 variables 3.0065
    3 variables 2.9238
    4 variables 2.9605
    5 variables 3.1075
  • All included variables in the model must have a p-value less than 0.2
    • This does not include the intercept p-value
  • At least one of the variables in the model must have a p-value less than 0.10
  • The R2 for the regression must be at least 0.5
  • All Relevant Variables must be valid (see next section)

Valid Relevant Variable Requirements

For the model to be valid for calculating adjusted energy consumption, the average of the predictor (x) variables used to calculate the adjusted consumption from the model must fall within either:
  • The range of observed data that went into the model or
  • Three standard deviations from the mean of the data that went into the model.
Requirements are based on the SUPERIOR ENERGY PERFORMANCE MEASUREMENT AND VERIFICATION PROTOCOL FOR INDUSTRY