已经解决了~~
A = xlsread('D:\25.xls')
x = unique(A(:,1));
n = length(x);
for i =1:n   %回归次数
      B=A(A(:,1)==x(i),2);
      C=A(A(:,1)==x(i),3);
      D=A(A(:,1)==x(i),4);
      E=A(A(:,1)==x(i),5);
      X = ones(length(B),1);
     [b,bint,r] = regress(B,[X,C,D,E]);
     s(i) = std(r(:))
     ss(i,1)=s(i)
end