<s>
A	O
bubble	B-Application
chart	I-Application
is	O
a	O
type	O
of	O
chart	O
that	O
displays	O
three	O
dimensions	O
of	O
data	O
.	O
</s>
<s>
Bubble	B-Application
charts	I-Application
can	O
facilitate	O
the	O
understanding	O
of	O
social	O
,	O
economical	O
,	O
medical	O
,	O
and	O
other	O
scientific	O
relationships	O
.	O
</s>
<s>
Bubble	B-Application
charts	I-Application
can	O
be	O
considered	O
a	O
variation	O
of	O
the	O
scatter	B-Application
plot	I-Application
,	O
in	O
which	O
the	O
data	O
points	O
are	O
replaced	O
with	O
bubbles	O
.	O
</s>
<s>
As	O
the	O
documentation	O
for	O
Microsoft	B-Application
Office	I-Application
explains	O
,	O
"	O
You	O
can	O
use	O
a	O
bubble	B-Application
chart	I-Application
instead	O
of	O
a	O
scatter	B-Application
chart	I-Application
if	O
your	O
data	O
has	O
three	O
data	O
series	O
that	O
each	O
contain	O
a	O
set	O
of	O
values	O
.	O
</s>
<s>
And	O
because	O
many	O
people	O
are	O
unfamiliar	O
with	O
—	O
or	O
do	O
not	O
stop	O
to	O
consider	O
—	O
the	O
issue	O
and	O
its	O
impact	O
on	O
perception	O
,	O
those	O
who	O
are	O
aware	O
of	O
it	O
often	O
have	O
to	O
hesitate	O
in	O
interpreting	O
a	O
bubble	B-Application
chart	I-Application
because	O
they	O
cannot	O
assume	O
that	O
the	O
scaling	O
correction	O
was	O
indeed	O
made	O
.	O
</s>
<s>
It	O
is	O
therefore	O
important	O
that	O
bubble	B-Application
charts	I-Application
not	O
only	O
be	O
scaled	O
correctly	O
,	O
but	O
also	O
be	O
clearly	O
labeled	O
to	O
document	O
that	O
it	O
is	O
area	O
,	O
rather	O
than	O
radius	O
or	O
diameter	O
,	O
that	O
conveys	O
the	O
data	O
.	O
</s>
<s>
For	O
example	O
,	O
bubble	B-Application
charts	I-Application
can	O
lead	O
to	O
misinterpretations	O
such	O
as	O
the	O
weighted	O
average	O
illusion	O
,	O
where	O
the	O
sizes	O
of	O
bubbles	O
are	O
taken	O
into	O
account	O
when	O
estimating	O
the	O
mean	O
x	O
-	O
and	O
y-values	O
of	O
the	O
scatterplot	B-Application
.	O
</s>
<s>
As	O
a	O
fallback	O
,	O
some	O
users	O
of	O
bubble	B-Application
charts	I-Application
resort	O
to	O
graphic	O
symbology	O
to	O
express	O
nonpositive	O
data	O
values	O
.	O
</s>
<s>
In	O
architecture	O
,	O
the	O
term	O
"	O
bubble	B-Application
chart	I-Application
"	O
is	O
also	O
applied	O
to	O
a	O
first	O
architectural	O
sketch	O
of	O
the	O
layout	O
constructed	O
with	O
bubbles	O
.	O
</s>
<s>
In	O
software	B-General_Concept
engineering	I-General_Concept
,	O
"	O
bubble	B-Application
chart	I-Application
"	O
can	O
refer	O
to	O
a	O
data	B-Application
flow	I-Application
,	O
a	O
data	B-General_Concept
structure	I-General_Concept
or	O
other	O
diagram	O
in	O
which	O
entities	O
are	O
depicted	O
with	O
circles	O
or	O
bubbles	O
and	O
relationships	O
are	O
represented	O
by	O
links	O
drawn	O
between	O
the	O
circles	O
.	O
</s>
<s>
In	O
Information	B-Application
visualization	I-Application
,	O
a	O
"	O
bubble	B-Application
chart	I-Application
"	O
may	O
refer	O
to	O
a	O
technique	O
in	O
which	O
a	O
set	O
of	O
numeric	O
quantities	O
is	O
represented	O
by	O
closely	O
packed	O
circles	O
whose	O
areas	O
are	O
proportional	O
to	O
the	O
quantities	O
.	O
</s>
<s>
Unlike	O
a	O
traditional	O
bubble	B-Application
chart	I-Application
,	O
such	O
displays	O
do	O
n't	O
assign	O
meaning	O
to	O
x	O
-	O
or	O
y-axis	O
positions	O
,	O
but	O
seek	O
to	O
pack	O
circles	O
as	O
tightly	O
as	O
possible	O
to	O
make	O
efficient	O
use	O
of	O
space	O
.	O
</s>
<s>
These	O
bubble	B-Application
charts	I-Application
were	O
introduced	O
by	O
Fernanda	O
Viegas	O
and	O
Martin	O
Wattenberg	O
and	O
have	O
since	O
become	O
a	O
popular	O
method	O
of	O
displaying	O
data	O
.	O
</s>
