<s>
In	O
exploratory	B-General_Concept
data	I-General_Concept
analysis	I-General_Concept
,	O
the	O
iconography	B-General_Concept
of	I-General_Concept
correlations	I-General_Concept
is	O
a	O
method	O
which	O
consists	O
in	O
replacing	O
a	O
correlation	O
matrix	O
by	O
a	O
diagram	O
where	O
the	O
“	O
remarkable	O
”	O
correlations	O
are	O
represented	O
by	O
a	O
solid	O
line	O
(	O
positive	O
correlation	O
)	O
,	O
or	O
a	O
dotted	O
line	O
(	O
negative	O
correlation	O
)	O
.	O
</s>
<s>
But	O
the	O
iconography	B-General_Concept
of	I-General_Concept
correlations	I-General_Concept
is	O
more	O
general	O
in	O
that	O
it	O
does	O
not	O
make	O
an	O
assumption	O
about	O
the	O
Gaussian	O
distribution	O
,	O
or	O
not	O
,	O
of	O
the	O
variables	O
,	O
and	O
relies	O
only	O
on	O
the	O
geometric	O
aspect	O
of	O
the	O
Correlation	O
coefficient	O
.	O
</s>
<s>
The	O
first	O
idea	O
of	O
the	O
iconography	B-General_Concept
of	I-General_Concept
correlations	I-General_Concept
dates	O
back	O
to	O
1975	O
.	O
</s>
