年份	用水量	传统GM(1,1)		函数变换		残差修正		弱化算子
年份	用水量	预测值	相对误差/%	预测值	相对误差/%	预测值	相对误差/%	预测值	相对误差/%
2011	301.81	301.81	0.00%	301.81	0.00%	301.81	0.00%	302.89	0.00%
2012	303.02	311.65	2.85%	299.89	1.03%	301.63	0.46%	308.40	−0.04%
2013	308.17	306.48	0.55%	313.73	1.81%	308.02	0.05%	307.00	0.07%
2014	307.60	301.40	2.01%	305.11	0.81%	307.35	0.08%	298.96	−0.20%
2015	299.30	296.40	0.97%	297.23	0.69%	297.87	0.48%	290.12	−0.11%
2016	290.60	291.49	0.31%	292.32	0.59%	292.45	0.64%	284.49	−0.17%
2017	284.90	286.66	0.62%	286.62	0.60%	286.98	0.73%	287.69	−0.14%
2018	287.80	285.90	0.66%	285.39	0.83%	286.37	0.50%	283.50	−0.04%
2019	283.40	280.23	1.12%	280.93	0.87%	285.62	0.78%	261.33	0.04%
2020	261.10	262.63	0.59%	262.53	0.55%	263.53	0.93%	302.89	0.09%