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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Bigprophete[/i] [br]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 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