x和y各为9个数,其中y已经是取过自然对数的了,拟合成形如f(x) = a*exp(b*x) + c*exp(d*x)的公式,并提示到:where x is normalized by mean 0.4976 and std 0.3081,请问,这是怎回事?我如何使用这个公式?我试过了把x除以0.4967,然后再带入公式,但计算结果和y差很多。看曲线拟合得很好啊,按说用拟合公式计算的结果不应该差很多啊
小白一枚,请各位指教,我应该怎么使用这个拟合公式啊!多谢!!!
Coefficients (with 95% confidence bounds):
a = 3.307 (2.82, 3.795)
b = 0.3261 (0.2537, 0.3985)
c = -1.133 (-1.613, -0.6535)
d = -0.8544 (-1.073, -0.6358)
Goodness of fit:
SSE: 0.008095
R-square: 0.9998
Adjusted R-square: 0.9997
RMSE: 0.04024