<s>
In	O
statistical	O
data	O
analysis	O
the	O
total	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
(	O
TSS	O
or	O
SST	O
)	O
is	O
a	O
quantity	O
that	O
appears	O
as	O
part	O
of	O
a	O
standard	O
way	O
of	O
presenting	O
results	O
of	O
such	O
analyses	O
.	O
</s>
<s>
For	O
wide	O
classes	O
of	O
linear	B-General_Concept
models	I-General_Concept
,	O
the	O
total	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
equals	O
the	O
explained	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
plus	O
the	O
residual	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
.	O
</s>
<s>
In	O
analysis	B-General_Concept
of	I-General_Concept
variance	I-General_Concept
(	O
ANOVA	B-General_Concept
)	O
the	O
total	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
is	O
the	O
sum	O
of	O
the	O
so-called	O
"	O
within-samples	O
"	O
sum	B-General_Concept
of	I-General_Concept
squares	I-General_Concept
and	O
"	O
between-samples	O
"	O
sum	B-General_Concept
of	I-General_Concept
squares	I-General_Concept
,	O
i.e.	O
,	O
partitioning	O
of	O
the	O
sum	B-General_Concept
of	I-General_Concept
squares	I-General_Concept
.	O
</s>
<s>
where	O
T	O
is	O
the	O
total	B-Algorithm
sum	I-Algorithm
of	I-Algorithm
squares	I-Algorithm
and	O
products	O
(	O
SSP	O
)	O
matrix	B-Architecture
,	O
W	O
is	O
the	O
within-samples	O
SSP	O
matrix	B-Architecture
and	O
B	O
is	O
the	O
between-samples	O
SSP	O
matrix	B-Architecture
.	O
</s>
<s>
Similar	O
terminology	O
may	O
also	O
be	O
used	O
in	O
linear	B-General_Concept
discriminant	I-General_Concept
analysis	I-General_Concept
,	O
where	O
W	O
and	O
B	O
are	O
respectively	O
referred	O
to	O
as	O
the	O
within-groups	O
and	O
between-groups	O
SSP	O
matrices	O
.	O
</s>
