Research and Model Prediction on the Performance of Recycled Brick Powder Foam Concrete

Table 11

Calculation formula of statistical indicators.

Measure	Calculation
Coefficient of determination (R2)
Root mean square error (RMSE)
Mean absolute error (MAE)
Root mean absolute error (RMAE)
Coefficient of efficiency (E)

was the actual target value, was the average value of ; was the predicted value, was the average of ; and was the number of model data.