考虑到有机体的生存环境通常存在许多不确定因素，我们用系综平均的方法给出准物种和误差阈的数值模拟。
Considering various uncontrollable factors in the living environment, we use the ensemble average to give the simulation of quasi-species and error threshold.
以穿透降雨为例，其模型模拟结果与实验比较，相对误差不超过2%，与野外观测比较，多次平均相对误差为6%。
Relative errors between simulation results of model and experiment were lower than 2%, and between model and field observation lower than 6% by the example of throughfall.
模拟的结果显示ANN模型比线性回归模型有更好的预测能力，预测的平均相对误差：ANN模型为14.9%，线性回归模型为25.8%。
Simulation results showed that the ANN model gave better predictions than the regressive model. The average relative error of ANN was 14.9% and that of linear regression was 25.8%.
模型一般以模型还原值与实际值平均相对误差检验模型的模拟精度。
Generally GM (1,1) model takes the average relative error between restored value of the model and real value as the criterion to evaluate the simulation precision.
结果表明：模拟的农沟排水量与试验观测值极为接近，年平均排水量误差仅为0.4%；
Results show that the simulated drainage volume from the field ditch is extremely close to the observed value, and the relative error of annual drainage volume is only 0.4%;
结果表明：模拟的农沟排水量与试验观测值极为接近，年平均排水量误差仅为0.4%；
Results show that the simulated drainage volume from the field ditch is extremely close to the observed value, and the relative error of annual drainage volume is only 0.4%;
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