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lavender_12

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[交流] 求助:matlab高斯拟合后,如何判断拟合的是否好? 已有1人参与

matlab高斯拟合后,如何判断拟合的是否好?
General model Gauss5:
       f(x) =
              a1*exp(-((x-b1)/c1)^2) + a2*exp(-((x-b2)/c2)^2) +
              a3*exp(-((x-b3)/c3)^2) + a4*exp(-((x-b4)/c4)^2) +
              a5*exp(-((x-b5)/c5)^2)
Coefficients (with 95% confidence bounds):
       a1 =       831.4
       b1 =       5.171
       c1 =    0.001535
       a2 =       278.6  (-3077, 3635)
       b2 =       5.368  (4.305, 6.431)
       c2 =      0.3409  (-3.68, 4.361)
       a3 =       175.8  (-4117, 4469)
       b3 =        4.96  (1.849, 8.071)
       c3 =      0.3325  (-1.836, 2.501)
       a4 =       155.4  (-712.9, 1024)
       b4 =       4.591  (3.309, 5.872)
       c4 =      0.3791  (-0.2027, 0.9609)
       a5 =       170.3  (125.7, 214.8)
       b5 =       4.084  (3.994, 4.175)
       c5 =      0.4751  (0.441, 0.5092)

Goodness of fit:
  SSE: 697.2
  R-square: 0.9998
  Adjusted R-square: 0.9998
  RMSE: 1.13

1,,a1,b1,c1后面没有括号(括号应该是置信区间吧?)说明好还是不好?
2,goodness of fit里面4个参数如何判断这个拟合是否好?是否可用?

[ Last edited by dbb627 on 2012-5-10 at 20:28 ]
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Goodness of fit 适合度
SSE 拟合误差
RMSE root mean square error 均方根误差
R square称为方程的确定系数,0~1之间,越接近1,表明方程的变量对y的解释能力越强。
R的判定只是一个方面,还要你的拟合数据和实际数据偏离,你可以画图看看。
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2楼2012-05-10 19:59:09
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