Data Analysis
Some brief recalls from last time
i xi Rp X
wi=/n
A step of preproccessing is often applied to the data that might be :
Normalisation
¯
xj=
nPn
i=xij j j X
yij =xij −¯
xj Y
¯
yj=
n
n
X
i=
yij =
Normalisation
s
j=
nPn
i=(xij −¯
xj) j j X
zij =xij−¯
xj
sj Z
Z
¯
zj=
n
n
X
i=
zij =,var(zj) =
n
n
X
i=
(zij −¯
zj)=
Example
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