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poporeborn

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[ÇóÖú] origin½øÐжà·åÄâºÏʱ³öÏÖfit did not converge£¬ÄâºÏ²»³ö½á¹û ÒÑÓÐ2È˲ÎÓë

ÎÒÏëÓÃorigin½øÐÐÒ»×éÊý¾ÝµÄ¶à·åÄâºÏ£¬ÄâºÏʱÀÏÊÇÌáʾ³ö´í£¬ÌáʾFit did not converge - mutual dependency exists between parameters.
You may have overparameterized the fitting function. Fixing one of them may eliminate this problem. Á½¸ö·åµÄλÖÃΪx=0; x=55£¬ÇóÖúÇóÖú~
Êý¾ÝÈçÏ£º
X    Y
0        140
5        86
10        69
15        21
20        36
25        40
30        37
35        45
40        72
45        113
50        312
55        1002
60        915
65        288
70        64
75        44
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origin½øÐжà·åÄâºÏʱ³öÏÖfit did not converge£¬ÄâºÏ²»³ö½á¹û
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poporeborn

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ÒýÓûØÌû:
4Â¥: Originally posted by dingd at 2014-06-18 09:25:57
ÄâºÏ·½Ãæ1stOpt±ÈOriginʹÓøü·½±ãЧ¹ûÒ²¸üºÃ¡£

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5Â¥2014-06-18 10:13:57
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dingd

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fegg7502: ½ð±Ò+1, Ó¦ÖúÖ¸Êý+1, ¹ÄÀø½»Á÷ 2014-06-19 08:06:03
1stOpt£¬Á½¸ö¸ß˹·åÄâºÏ£º
CODE:
Function y=y0+(A/(w*sqrt(PI/2)))*exp(-2*((x-xc)/w)^2)+(A1/(w1*sqrt(PI/2)))*exp(-2*((x-xc1)/w1)^2);
Data;
X    Y
0        140
5        86
10        69
15        21
20        36
25        40
30        37
35        45
40        72
45        113
50        312
55        1002
60        915
65        288
70        64
75        44

¾ù·½²î(RMSE):16.3553293169684
²Ð²îƽ·½ºÍ(SSE):4279.9487530638
Ïà¹ØÏµÊý(R): 0.998481079218084
Ïà¹ØÏµÊý֮ƽ·½(R^2): 0.99696446555651
È·¶¨ÏµÊý(DC): 0.99696446555651
¿¨·½ÏµÊý(Chi-Square): 31.1858861645095
Fͳ¼Æ(F-Statistic): 494.146921382186

²ÎÊý        ×î¼Ñ¹ÀËã
----------        -------------
y0        47.9165604779861
a        11868.9679731091
w        8.86544591919859
xc        57.2168293189576
a1        1762.60009136364
w1        12.6231878244523
xc1        -3.94180705378648

Ò»¸ö·åÔÚx=-3.94£¬ÁíÒ»¸öÔÚx=57.21
origin½øÐжà·åÄâºÏʱ³öÏÖfit did not converge£¬ÄâºÏ²»³ö½á¹û-1
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2Â¥2014-06-17 22:13:33
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

poporeborn

Í­³æ (³õÈëÎÄ̳)

ÒýÓûØÌû:
2Â¥: Originally posted by dingd at 2014-06-17 22:13:33
1stOpt£¬Á½¸ö¸ß˹·åÄâºÏ£º

Function y=y0+(A/(w*sqrt(PI/2)))*exp(-2*((x-xc)/w)^2)+(A1/(w1*sqrt(PI/2)))*exp(-2*((x-xc1)/w1)^2);
Data;
X    Y
0        140
5        86
10        69
15        21
2 ...

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3Â¥2014-06-18 08:57:51
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dingd

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

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¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
poporeborn: ½ð±Ò+20, ¡ï¡ï¡ïºÜÓаïÖú 2014-06-18 10:13:02
fegg7502: ½ð±Ò+2, Ó¦ÖúÖ¸Êý+1, ¹ÄÀø½»Á÷ 2014-06-19 08:06:13
ÄâºÏ·½Ãæ1stOpt±ÈOriginʹÓøü·½±ãЧ¹ûÒ²¸üºÃ¡£
origin½øÐжà·åÄâºÏʱ³öÏÖfit did not converge£¬ÄâºÏ²»³ö½á¹û-2
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4Â¥2014-06-18 09:25:57
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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