参数
β
\beta
β的最小二乘估计 设
r
a
n
k
(
C
)
=
m
+
1
≤
n
rank(C)=m+1≤n
rank(C)=m+1≤n,则
β
^
=
b
=
(
C
T
C
)
−
1
C
T
Y
\widehat{\beta}=b=(C^{T}C)^{-1}C^{T}Y
β=b=(CTC)−1CTY是
β
\beta
β的最小二乘估计
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