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Bigprophete

France
20 Posts
Posted - 10/25/2019 :  07:44:26 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,
I created a function to fit my data.

Equation : A*((r*1.7/(B*1e6))*9.274E-24*1e6)-(1-A)*((t*9.3/(C*1e6))*9.274E-24*1e6)*(1-s*(x)^1.5-ss*(x)^2.5)

I fixed some of the parameter (A, ss, r and t) and performed the fit on my data. The fit converge to a value, however I don't get the standard Error for the parameter B,C and s...In the column of Standard Error I get "--" (see attached image)
What I did wrong ? I really need to get the Standard Error...

Thanks
Here the data for column A and B

335.93948 16244.01544
334.93523 16234.12475
333.92593 16216.48298
332.92644 16212.67181
331.94675 16189.07483
330.92783 16180.08997
329.91382 16128.09515
328.94777 16103.61573
327.9319 16074.39354
326.91028 16037.92744
325.92738 16013.08856
324.88615 15979.61217
323.92619 15947.95472
322.9628 15913.52719
321.9209 15879.80226
320.92744 15840.88784
319.93585 15811.51259
318.92924 15780.15057
317.91716 15764.58931
316.93578 15728.6423
315.92419 15698.83161
314.95891 15660.44169
313.93671 15620.20708
312.93977 15594.64295
311.91212 15565.4901
310.92836 15526.24988
309.91187 15499.76282
308.94173 15456.69346
307.91475 15421.82271
306.92445 15381.61596
305.91353 15331.3192
304.93935 15291.75966
303.93045 15255.0472
302.95505 15222.37734
301.93903 15175.94499
300.91875 15142.10023
299.92122 15102.70938
298.91646 15066.38598
297.9426 15021.30855
296.90395 14967.6973
295.8894 14935.18682
294.91951 14905.37752
293.93481 14867.25494
292.94664 14807.85553
291.93967 14777.66411
290.9425 14741.62401
289.90338 14700.05209
288.97734 14653.01598
287.92693 14607.22083
286.96861 14559.3885
285.94739 14523.14851
284.96236 14477.55156
283.9249 14438.40376
282.90886 14381.00111
281.89267 14343.856
280.93573 14305.87061
279.91756 14261.09682
278.94879 14215.96713
277.9173 14169.85853
276.93404 14128.4782
275.90239 14087.81291
274.90034 14047.79749
273.91031 14003.99489
272.9212 13968.02953
271.94406 13926.81967
270.9321 13874.86561
269.91859 13832.10904
268.91284 13792.05639
267.9221 13747.25509
266.91109 13704.49314
265.91547 13652.69695
264.9286 13611.78469
263.92068 13564.67676
262.92255 13516.10984
261.94849 13479.72004
260.90248 13431.78463
259.92683 13382.79204
258.91501 13334.85099
257.93733 13295.69528
256.92371 13247.3119
255.93273 13209.22006
254.92439 13169.39299
253.90658 13126.78716
252.90662 13077.04484
251.92144 13033.50442
250.92677 12990.8286
249.93929 12947.4915
248.95944 12906.27816
247.95264 12860.21261
246.93603 12809.08247
245.9342 12764.81067
244.93276 12712.96255
243.9174 12671.20226
242.93974 12620.06341
241.90633 12572.63819
240.90684 12525.73788
239.89669 12480.16611
238.93195 12435.78258
237.91554 12385.80638
236.96897 12339.98917
235.92059 12292.8879
234.92477 12248.55491
233.90616 12201.93369
232.93438 12153.21376
231.9195 12103.95552
230.9597 12059.96924
229.93349 12005.17851
228.91163 11964.26402
227.91709 11918.09391
226.95058 11869.65263
225.92925 11819.80805
224.92708 11771.28369
223.9268 11722.55761
222.91147 11677.88679
221.89778 11623.22712
220.92078 11577.43594
219.89747 11529.59362
218.9015 11486.27261
217.93275 11433.86173
216.92924 11386.01021
215.93262 11335.56331
214.9244 11287.64802
213.93481 11241.14004
212.93407 11191.43947
211.91835 11142.6519
210.93414 11098.57716
209.9314 11051.23199
208.92145 10996.80647
207.93204 10949.41996
206.94692 10898.20825
205.88761 10855.22598
204.94492 10810.40468
203.92599 10758.0698
202.93102 10705.53683
201.91843 10661.75097
200.91348 10605.05533
199.9229 10558.9246
198.91808 10503.23211
197.93438 10455.35936
196.92239 10404.17406
195.92733 10359.0207
194.92857 10310.96864
193.90552 10256.71669
192.91553 10207.67108
191.91247 10150.82594
190.94674 10103.17322
189.92268 10049.15803
188.92902 10000.62085
187.91178 9947.96302
186.89604 9903.66618
185.94713 9847.17177
184.92022 9795.19433
183.88592 9749.5281
182.95052 9694.41124
181.89485 9644.33956
180.89742 9599.33925
179.95933 9539.37896
178.84223 9488.83082
177.85688 9445.93021
176.96386 9386.39019
175.86347 9341.13584
174.85945 9293.75009
173.94936 9233.10023
172.82081 9188.21402
171.88503 9136.14989
170.92331 9081.0692
169.84781 9026.92091
168.90752 8984.33915
167.87247 8931.8687
166.83089 8882.6558
165.96697 8824.38138
164.83273 8772.45556
163.84768 8724.66222
162.93011 8663.75674
161.79422 8616.55908
160.8805 8563.29321
159.89745 8504.9144
158.80702 8463.28808
157.96522 8410.76315
156.87148 8354.24978
155.83409 8306.98667
154.95513 8249.12454
153.82865 8201.8391
152.90539 8151.35593
151.88185 8095.40941
150.86047 8052.14306
149.98164 7989.8887
148.82188 7937.54252
147.88835 7889.49601
146.93233 7828.13477
145.83759 7785.21006
144.97658 7730.15541
143.86973 7674.00068
142.8496 7625.41889
141.95629 7568.85646
140.84529 7517.78009
139.94409 7463.34599
138.87258 7408.44311
137.84757 7358.08269
136.9646 7304.55781
135.83441 7258.5182
134.90256 7205.47359
133.90933 7149.00896
132.83015 7099.16589
131.97046 7039.06159
130.88394 6991.24554
129.91676 6941.87927
128.93891 6886.61522
127.81955 6833.96153
126.98793 6775.40548
125.89279 6721.35136
124.87261 6678.06434
123.94038 6619.62744
122.85128 6568.70681
121.96922 6515.11467
120.91671 6461.39583
119.85526 6408.0604
118.93389 6353.87922
117.86955 6305.35221
116.96047 6247.97678
115.9009 6197.27399
114.9464 6142.19894
113.91573 6096.66269
112.93198 6041.81755
111.86923 5987.64344
110.94345 5939.50891
109.89083 5887.18023
108.93425 5834.80944
107.93083 5782.54471
106.93491 5728.65391
105.91491 5682.85266
104.93038 5632.59062
103.93769 5581.36328
102.90983 5528.8488
101.93848 5478.56414
100.9358 5429.76659
99.91858 5380.09713
98.9292 5329.87055
97.92617 5282.52403
96.93908 5234.66448
95.93444 5185.23147
94.92847 5136.68763
93.92556 5091.61022
92.91932 5040.43949
91.93268 4992.09533
90.9346 4945.85776
89.92589 4899.12638
88.93377 4855.42277
87.93392 4805.93701
86.93091 4763.2452
85.93236 4715.88015
84.9334 4672.64336
83.91942 4628.9546
82.94052 4579.52398
81.9285 4536.02449
80.93577 4492.60511
79.95087 4451.21559
78.94214 4410.71756
77.95799 4373.01966
76.94317 4331.40705
75.95225 4293.3127
74.9495 4254.07194
73.94405 4212.04015
72.9395 4171.94419
71.93571 4135.48295
70.94814 4096.67925
69.95694 4061.91132
68.94614 4024.21306
67.94817 3987.77782
66.94543 3950.23436
65.95695 3918.10921
64.93111 3888.43522
63.94833 3855.06235
62.94183 3821.54028
61.94798 3789.02494
60.95844 3759.26489
59.95558 3730.96491
58.94162 3693.72091
57.93914 3665.43091
56.96611 3639.31586
55.94633 3611.66458
54.94087 3588.17347
53.92462 3557.16713
52.95257 3537.11421
51.9273 3517.76773
50.91369 3491.92245
49.93797 3469.25769
48.91319 3448.99314
47.91893 3427.88378
46.94452 3407.73782
45.93758 3387.4813
44.89425 3369.32111
43.91922 3354.69678
42.90357 3338.83946
41.86777 3321.22006
40.88128 3306.49511
39.8762 3291.00773
38.88709 3277.29188
37.82431 3265.54783
36.87747 3257.26526
35.91593 3244.92568
35.00621 3238.67736
33.88482 3224.54652
32.81922 3217.47803
31.89827 3216.45573
30.83768 3206.46098
29.80567 3200.28883
28.94443 3198.76482
27.84605 3195.23673
26.87926 3188.94581
25.76698 3184.17314
24.92732 3186.23628
23.81311 3183.13654
23.01417 3179.9554
21.88076 3177.94871
20.71923 3180.06402
19.91098 3180.05102
18.9557 3178.76266
17.93987 3177.40278
16.93248 3175.49801
15.93746 3180.23446
14.94552 3179.21528
13.91383 3179.77217
12.88144 3176.92594
11.88465 3175.8107
10.91341 3176.48456
9.96815 3175.75391
8.81608 3174.17995
7.91152 3177.01116
6.93917 3177.53306
5.94073 3177.28483
4.99099 3178.65429
Edited by - Bigprophete on 10/25/2019 07:52:37 AM

YimingChen

1691 Posts
Posted - 10/25/2019 :  4:43:51 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Would you please attach the image again? Also what initial values of the parameters do you use? Thank you.

James
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Bigprophete

France
20 Posts
Posted - 10/28/2019 :  09:18:02 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The initial parameters:
A = 0.85 (fixed)
B = 6.645E-29
C = 1.918E-28
s = 3.23E-6
ss = -4E-9
r = 5 9fixed)
t = 1 (fixed)
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Bigprophete

France
20 Posts
Posted - 10/28/2019 :  09:20:22 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply


Here the image
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YimingChen

1691 Posts
Posted - 10/28/2019 :  11:00:54 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

When I tried to fit the data with your settings, it gets the same Reduced Chi-Sqr value and Adj.R-Square as yours but the fit doesn't converge. Would you mind sending your project file to <tech@originlab.com> that we can check further? Thank you.

James
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