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Hoco87

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2Â¥: Originally posted by lwloveflxgg at 2019-09-05 17:37:45
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y = (p1+p3*x)/(1+p2*x+p4*x^2)*sgn(136-x)+
( p5+p6*x+p7*x^0.5+p8/Ln(x)+p9/x)*sgn(x-135)
sgn(x)Ϊ·ûºÅº¯Êý  if  x>=0 sgn(x)=1
                 if  x=0 sgn(x)=0  
if  x<0 sgn(x)=-1

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5Â¥2019-09-06 22:41:54
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Hoco87

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5Â¥: Originally posted by feixiaolin at 2019-09-06 22:41:54
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y = (p1+p3*x)/(1+p2*x+p4*x^2)*sgn(136-x)+
( p5+p6*x+p7*x^0.5+p8/Ln(x)+p9/x)*sgn(x-135)
sgn(x)Ϊ·ûºÅº¯Êý  if  x&gt;=0 sgn(x)=1
   ...



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Hoco87

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4Â¥: Originally posted by lwloveflxgg at 2019-09-06 11:49:14
https://wenku.baidu.com/view/59f84e6b32687e21af45b307e87101f69e31fbb5.html  ºÃÏñÊÇ·ÅÉäÎïÀíѧµÄ¸ÅÄÎÒ¿´ÎÄ¿âÀïÓÐÌáµ½µÄ¡£
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dingd

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x<=135, y=1/(p1+p2*x+p3/x)+p4
x>135, y=b1+b2/(1+((x-b3)/p4)^2)+b5*x+b6/x

Root of Mean Square Error (RMSE): 0.000818941360502226
Sum of Squared Residual: 0.000268265980776495
Correlation Coef. (R): 0.998950630413412
R-Square: 0.997902362003353
Adjusted R-Square: 0.997891794557526
Determination Coef. (DC): 0.997902361998357
Chi-Square: 0.0105503282182204
F-Statistic: 23251.2148161944

Parameter        Best Estimate
----------        -------------
p1        170.500356458424
p2        -2.30956003827742
p3        20335.0075099944
p4        0.0265346950026455
b1        -0.00803839140152831
b2        7.76509612773163
b3        136.230211854375
b5        9.87851102352787E-6
b6        1.96446488332825
9Â¥2019-09-29 11:08:07
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