摘要:线性回归系数值线性回归系数值用来记录最大偏差寻找最大偏差最大偏差为求灵敏度灵敏度为求线性误差非线性误差为返回的系数公式返回常量系数系数公式求和求平方和返回对应项相乘后的和区间区间区间区间
public class LeastSquares { public static void matching(double[] x, double[] y, double[] input, double fully) { double k = getK(x, y); double b = getB(x, y); System.out.println("线性回归系数k值:/t"+k+"/n" + "线性回归系数b值:/t" + b); double maxy = 0; //用来记录最大偏差 //寻找最大偏差 for (int i = 0; i < input.length; i++) { if (Math.abs(k * input[i] + b - y[i]) > maxy){ maxy = Math.abs(k * input[i] + b - y[i]); } } System.out.println("最大偏差为:" + maxy); //求灵敏度 double s = 0; double sum = 0; for (int i = 1; i < y.length; i++) { sum += y[i] - y[i-1]; } s = sum / (y.length - 1) / 20; System.out.println("灵敏度为:" + s); //求线性误差 System.out.println("非线性误差为:" + maxy/fully); } //返回x的系数k公式:k=( n sum( xy ) - sum( x ) sum( y ) )/( n sum( x^2 )-sum(x) ^ 2 ) public static double getK(double[] x, double[] y) { int n = x.length; return (double) ((n * pSum(x, y) - sum(x) * sum(y)) / (n * sqSum(x) - Math.pow(sum(x), 2))); }//返回常量系数系数b 公式:b = sum( y ) / n - k * sum( x ) / n public static double getB(double[] x, double[] y) { int n = x.length; double k = getK(x, y); return sum(y) / n - k * sum(x) / n; }//求和 private static double sum(double[] ds) { double s = 0; for (double d : ds) { s = s + d; } return s; }//求平方和 private static double sqSum(double[] ds) { double s = 0; for (double d : ds) { s = (double) (s + Math.pow(d, 2)); } return s; }//返回对应项相乘后的和 private static double pSum(double[] x, double[] y) { double s = 0; for (int i = 0; i < x.length; i++) { s = s + x[i] * y[i]; } return s; } public static void main(String[] args) { double[] x1 = {0,0.2,0.4,0.6,0.8,1.0}; double[] y1 = {17.6,73.6,133,200,256,312}; double[] inputs1 = x1; double[] x2 = {0,-0.2,-0.4,-0.6,-0.8,-1.0}; double[] y2 = {40.0,96,152,208,264,328}; double[] inputs2 = x2; double[] x3 = {0,0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0,2.2,2.4,2.6,2.8,3.0}; double[] y3 = {17.6,73.6,133,200,256,312,372,428,484,548,600,672,712,776,832,888}; double[] inputs3 = x3; double[] x4 = {0,-0.2,-0.4,-0.6,-0.8,-1.0,-1.2,-1.4,-1.6,-1.8,-2.0,-2.2,-2.4,-2.6,-2.8,-3.0}; double[] y4 = {40.0,96,152,208,264,328,384,440,496,552,616,666,720,784,840,898}; double[] inputs4 = x4; System.out.println("+1区间"); matching(x1, y1,inputs1,y1[y1.length-1]); System.out.println("-1区间"); matching(x2, y2,inputs2,y2[y2.length-1]); System.out.println("+3区间"); matching(x3, y3,inputs3,y3[y3.length-1]); System.out.println("-3区间"); matching(x4, y4,inputs4,y4[y4.length-1]); }}
文章版权归作者所有,未经允许请勿转载,若此文章存在违规行为,您可以联系管理员删除。
转载请注明本文地址:https://www.ucloud.cn/yun/123008.html
摘要:线性回归系数值线性回归系数值用来记录最大偏差寻找最大偏差最大偏差为求灵敏度灵敏度为求非线性误差非线性误差为返回的系数公式返回常量系数系数公式求和求平方和返回对应项相乘后的和热电阻测温实验拟合直线 ...
摘要:综合诸多考虑与相应调研,我们希望能够制作出一款宿舍升降机为同学们提供更方便安全的上下床方式。摘要本设计采用开发板作为主控,结合压力传感器红外避障传感器电机驱动模块实现了一个可以自动升降自动停止自动调速的宿舍升降机模型系统。 (第一次写博客,记录下自己大一时做的一个课设,如有不妥之处,还望多...
摘要:为了解决人们因工作出差旅游等短期时间内家中宠物无人照顾的问题,我们基于物联网开发板机智云平台和各类传感器模块研究设计了一套针对短期内宠物无人照顾的智能宠物屋系统。 正式介绍作品前先说明一下,我是湖南文理学院计算机与电气工程学院的一名大三学生,我叫陈海涛。作品全部内容均为个人创意、个人设计并手...
阅读 1974·2021-11-19 11:37
阅读 535·2021-11-11 16:54
阅读 1105·2021-11-02 14:44
阅读 2935·2021-09-02 15:40
阅读 2309·2019-08-30 15:44
阅读 898·2019-08-29 11:17
阅读 1023·2019-08-26 14:06
阅读 1502·2019-08-26 13:47