数据描述性分析

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1、28.901.8032.500.1049.403.5030.302.10348.8010.10134.003.90899.4034.00685.9061.201142.70'30.80448.50334.20503.1021.80332.30188.50405.9011.30236.405.80450.6015.70224.6020.10529.5073.70195.90308.80688.0066.20371.60132.30433.2082.30215.50330.50405.9054.00226.101

2、04.30658.3027.10352.60134.80665.7051.90480.3085.20817.9056.80423.20390.10439.9039.40292.30101.20769.9050.90605.0041.00];%B知样本X=[431.3047.20210.6014.401401.3047.20654.70350.701331.6057.00693.8020.40279.9015.10118.505.10]；袜知样本A2=A(1:14,:);瀏二类数据A1=A(15:26,:);%

3、第一类数据n1=12;n2=14;p=4;s1=cov(A1);s2=cov(A2);s=((n1-1)*s1+(n2-1)*s2)/(n1+n2-2);Q01=(n1-1)*(log(det(s))-log(det(s1))-p+trace(inv(s)*s1));Q02=(n2-1)*(log(det(s))-log(det(s2))-p+trace(inv(s)*s2));P=1-chi2cdf{[Q01,Q02],p*(p+1)/2)%%滋上计算可得两总体的协方差距阵相等ml=mean(A1);m2=

4、mean(A2);fori=1:4淋知样本到两类总d(i)=(X(i,:)-m1广inv(s广(X(i,:)-m1)'-(X(i,:)-m2广inv(s)"X(i,:)-m2)'体的马氏距离之差函数end呢十算第一类误判为第二类的个数a1a1=0;fori=1:n1d仁(A1(i,:)-m1)*inv(s)*(A1(i,:)-m1)*-(A1(i,:)-m2)*inv(s)*(A1(i,:)-m2)';ifd1>0a1=a1+1;elsea1=a1;endend%十算第二类误判为第一类的个数a2a2=0;fo

5、rj=1:n2d2二广inv(s广(A2(j,:)-rrd)'-(A2(j,:)-m2广inv(s广ifd2<0a2=a2+1;elsea2=a2;endendwph=(a1+a2)/(n1+n2)%回代误判率%+算交叉误判率a"二0;fori=1:n2B1=[A2(1:i-1,:);A2(i+1:n2,:)];mb1=mean(B1);b1=mean(A1);sb1=cov(B1);I1=n2-1;l2=n1;p=4;T1=((I1-1)*sb1+(l2-1)*s1)/(11+I2-2);Q仁(IK)*(l

6、og(det(T1))-log(det(sb1))-p+trace(inv(T1)*sb1));Q2=(I2-1)*(log(det(T1))-log(det(s1))-p+trace(inv(T1)*s1));P1=1-chi2cdf(Q1,p*(p+1)/2);P2=1-chi2cdf(Q2,p*(p+1)/2);ifP1>0.05&&P2>0.05d11(i)=(A2(i,:)-mb1)*inv(T1)*{A2(i,:)-mb1)*-(A2(i,:)-b1)*inv(T1)*(A2(i,:)-b1)';

7、elsed11(i)二mahal(A2(i,:),B1)-mahal(A2(i,:),A1);endenda12=0;forj=1:n1B2=[A1(1:j-1,:);A1(j+1:n1,:)];mb2=mean(B2);b2=mean(A2);sb2=cov(B2);11仁n1-1;l12=n2;p=4;T2=((I11-1)*sb2+(l12-1)*s2)/(H1+112-2);Q4仁(I笛/广(log(det(T2))-log(det(sb2))-p+trace(inv仃2)*sb2));Q12=(11

8、2-1)*(log(det(T2))-log(det(s2))-p+trace(inv(T2)*s2));P11=1-chi2cdf(Q11,p*(p+1)/2);P12=1-chi2cdf(Q12,p*(p+1)/2);ifP11>0.05&&P12>0.05d120)=(A10，:)-mb2)*inv(T2)*{A1G，:)-mb2),-(A1(j,：)-b2)*inv(T2)*(A1(j,:)