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subroutine ls(n,x,y,yz)
integer::n,i
real::x(n),y(n),yx(n),yz(n),b2,b1,s1,s2,s3,s4,q,u,f,as3
s1=0.0
s2=0.0
s3=0.0
s4=0.0
u=0.0
q=0.0
do i=1,n
s1=s1+x(i)*y(i)
s2=s2+x(i)
s3=s3+y(i)
s4=s4+x(i)**2
enddo
b2=(n*s1-s2*s3)/(n*s4-s2**2)
b1=(s3-b2*s2)/n
do i=1,n
yx(i)=b1+b2*x(i)
yz(i)=y(i)-yx(i)
enddo
as3=s3/n
do i=1,n
q=q+(y(i)-yx(i))**2
u=u+(yx(i)-as3)**2
enddo
f=(u/1)/(q/(n-1-1))
print*,'podu',b2
print*,'jianyan f',f
end subroutine
!相关系数
subroutine r2(n,x,y,corr)
implicit none
integer::n,i
real::x(n),y(n),s1,s2,s3,s4,s5,corr
s1=0.0
s2=0.0
s3=0.0
s4=0.0
s5=0.0
do i=1,n
s1=s1+x(i)*y(i)
s2=s2+x(i)
s3=s3+y(i)
s4=s4+x(i)**2
s5=s5+y(i)**2
enddo
corr=(n*s1-s2*s3)/sqrt((n*s4-s2**2)*(n*s5-s3**2))
print *, corr
end subroutine
end module