Crossposting from stackoverflow <https://stackoverflow.com/questions/49238446/polynomial-regression-with-apache-maths-3-6-1> as I did not get any reply there
Can someone let me know how I can do Polynomial Regression with Apache Maths <https://mvnrepository.com/artifact/org.apache.commons/commons-math3> 3.6.1 ? Below are the data points I used for my testing 60735214881.391304 1520254800000.00000060697824142.469570 1520258400000.00000060651182200.208694 1520262000000.00000060684367132.939130 1520265600000.00000060676588613.008700 1520269200000.00000060641816564.869570 1520272800000.00000060604714824.233510 1520276400000.00000060580042814.330440 1520280000000.00000060536134542.469570 1520283600000.00000060566323732.034780 1520287200000.00000060578775249.252174 1520290800000.00000060547382844.104350 1520294400000.00000060536776546.802160 1520298000000.00000060474342718.330440 1520301600000.00000060452725477.286960 1520305200000.00000060486821569.669560 1520308800000.00000060247997139.995674 1520312400000.00000060248432181.426090 1520316000000.00000060217476247.373920 1520319600000.00000060170744493.634780 1520323200000.000000 My code looks like below private void polynomialFitter(List<List<Double>> pointlist) { final PolynomialCurveFitter fitter = PolynomialCurveFitter.create(2); final WeightedObservedPoints obs = new WeightedObservedPoints(); for (List<Double> point : pointlist) { obs.add(point.get(1), point.get(0)); } double[] fit = fitter.fit(obs.toList()); System.out.printf("\nCoefficient %f, %f, %f", fit[0], fit[1], fit[2]); } The coefficients are reported as Coefficient 12.910025, 0.000000, 0.000000 But these does not seem to be quite correct. If I use the same dataset in Online Polynimal Regression <http://polynomialregression.drque.net/online.php> and in archanoid online regression <https://arachnoid.com/polysolve/> - both reports same value as 654623237474.68250993904929103762, 28.75921919628759991574, -0.00000000023885199278 Can someone let me know what is going wrong? I have seen this question <https://stackoverflow.com/questions/28563361/polynomial-regression-with-apache-maths-java> but that is not helping me? Thanks,
