public class CPKMethed {
private static double SL=12;//下限
private static double SU=13;//上限
public static void main(String[] args) {
List<Double>list=new ArrayList<Double>();
for(int i=0;i<150;i++){
if(i<149){
list.add(12.5);
}else{
list.add(12.1);
}
}
System.out.println(Cpkresult(list,SL,SU));
System.out.println(Cpresult(list,SL,SU));
}
public static double Cpresult(List<Double>list,double SL,double SU){
double ave=C41(list);
//System.out.println(ave);
double c42=C42(list,ave);
//System.out.println(c42);
double cp=F41(SL,SU,c42);
return cp;
}
public static double Cpkresult(List<Double>list,double SL,double SU){
double ave=C41(list);
//System.out.println(ave);
double c42=C42(list,ave);
//System.out.println(c42);
double cp=F41(SL,SU,c42);
//System.out.println(cp);
double AD372=AD372(SL,SU,ave);
double AD373=AD373(AD372,cp);
double result=CPK(AD372,AD373);
//System.out.println(result);
return result;
}
/**
* CPK
* @return
*/
public static double CPK(double AD372,double AD373){
double result;
if(AD372>1||AD372==1){
result=0;
}else{
result=AD373;
}
return result;
}
public static double AD372(double SL,double SU,double Ave){
double a=Math.abs(0.5*(SU+SL)-Ave);
double result=a/(0.5*(SU-SL));
return result;
}
public static double AD373(double AD372,double CP){
double result=(1-AD372)*CP;
return result;
}
/**
* 标准偏差
* @return
*/
public static double C42(List<Double> list,double Average){
double sum=0;
for(int i=0;i<list.size();i++){
double a=list.get(i)-Average;
a=a*a;
sum=sum+a;
}
double Reagan=sum/(list.size()-1);
double result = Math.sqrt(Reagan);
return result;
}
/**
* 平均值
* @return
*/
public static double C41(List<Double> list){
double sum=0;
for(int i=0;i<list.size();i++){
sum=sum+list.get(i);
}
return sum/list.size();
}
/**
* （下限规格-上限规格）/（6*标准偏差）
* cp值
* @return
*/
public static double F41(double SL,double SU,double C42){
double result=(SU-SL)/(6*C42);
return result;
}
}
打印结果：
5.075887078100676
5.103103630798282