<s>
NodeXL	B-Protocol
is	O
a	O
network	O
analysis	O
and	O
visualization	O
software	O
package	O
for	O
Microsoft	B-Application
Excel	I-Application
2007/2010/2013/2016	I-Application
.	O
</s>
<s>
The	O
package	O
is	O
similar	O
to	O
other	O
network	O
visualization	O
tools	O
such	O
as	O
Pajek	B-Application
,	O
UCINet	O
,	O
and	O
Gephi	B-Application
.	O
</s>
<s>
NodeXL	B-Protocol
enables	O
researchers	O
to	O
undertake	O
social	O
network	O
analysis	O
work	O
metrics	O
such	O
as	O
centrality	O
,	O
degree	O
,	O
and	O
clustering	O
,	O
as	O
well	O
as	O
monitor	O
relational	O
data	O
and	O
describe	O
the	O
overall	O
relational	O
network	O
structure	O
.	O
</s>
<s>
When	O
applied	O
to	O
Twitter	B-Application
data	B-General_Concept
analysis	I-General_Concept
,	O
it	O
showed	O
the	O
total	O
network	O
of	O
all	O
users	O
participating	O
in	O
public	O
discussion	O
and	O
its	O
internal	O
structure	O
through	O
data	B-Application
mining	I-Application
.	O
</s>
<s>
NodeXL	B-Protocol
is	O
a	O
set	O
of	O
prebuilt	O
class	O
libraries	O
using	O
a	O
custom	O
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
control	O
.	O
</s>
<s>
Additional	O
.NET	B-Application
assemblies	O
can	O
be	O
developed	O
as	O
"	O
plug-ins	O
"	O
to	O
import	O
data	O
from	O
outside	O
data	O
providers	O
.	O
</s>
<s>
Currently-implemented	O
data	O
providers	O
for	O
NodeXL	B-Protocol
include	O
YouTube	B-General_Concept
,	O
Twitter	B-Application
,	O
Wikipedia	O
(	O
the	O
MediaWiki	O
understructure	O
)	O
,	O
web	O
hyperlinks	O
,	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
.	O
</s>
<s>
NodeXL	B-Protocol
is	O
a	O
collaborative	O
effort	O
of	O
a	O
number	O
of	O
individuals	O
from	O
different	O
universities	O
and	O
other	O
organizations	O
forming	O
the	O
NodeXL	B-Protocol
Team	O
.	O
</s>
<s>
Microsoft	O
Research	O
established	O
a	O
NodeXL	B-Protocol
research	O
project	O
on	O
November	O
20	O
,	O
2008	O
.	O
</s>
<s>
NodeXL	B-Protocol
is	O
intended	O
for	O
users	O
with	O
little	O
or	O
no	O
programming	O
experience	O
to	O
allow	O
them	O
to	O
collect	O
,	O
analyze	O
,	O
and	O
visualize	O
a	O
variety	O
of	O
networks	O
.	O
</s>
<s>
NodeXL	B-Protocol
integrates	O
into	O
Microsoft	B-Application
Excel	I-Application
2007	O
,	O
2010	O
,	O
2013	O
,	O
2016	O
,	O
2019	O
and	O
365	O
and	O
opens	O
as	O
a	O
workbook	O
with	O
a	O
variety	O
of	O
worksheets	O
containing	O
the	O
elements	O
of	O
a	O
graph	B-Application
structure	I-Application
such	O
as	O
edges	O
and	O
nodes	O
.	O
</s>
<s>
NodeXL	B-Protocol
can	O
also	O
import	O
a	O
variety	O
of	O
graph	O
formats	O
such	O
as	O
edgelists	O
,	O
adjacency	O
matrices	O
,	O
GraphML	B-Language
,	O
UCINet	O
.dl	O
,	O
and	O
Pajek	B-Application
.net	B-Application
.	O
</s>
<s>
NodeXL	B-Protocol
Pro	O
imports	O
UCINet	O
and	O
GraphML	B-Language
files	O
,	O
as	O
well	O
as	O
Excel	B-Application
spreadsheets	O
containing	O
edge	O
lists	O
or	O
adjacency	O
matrices	O
,	O
into	O
NodeXL	B-Protocol
workbooks	O
.	O
</s>
<s>
NodeXL	B-Protocol
Pro	O
also	O
allows	O
for	O
the	O
quick	O
collection	O
of	O
social	O
media	O
data	O
via	O
a	O
set	O
of	O
import	O
tools	O
which	O
can	O
collect	O
network	O
data	O
from	O
e-mail	O
,	O
Twitter	B-Application
,	O
YouTube	B-General_Concept
,	O
and	O
Flickr	O
.	O
</s>
<s>
NodeXL	B-Protocol
asks	O
for	O
the	O
user	O
's	O
permission	O
before	O
collecting	O
any	O
personal	O
data	O
and	O
focuses	O
on	O
the	O
collection	O
of	O
publicly	O
available	O
data	O
,	O
such	O
as	O
Twitter	B-Application
statuses	O
and	O
follows	O
relationships	O
for	O
users	O
who	O
have	O
made	O
their	O
accounts	O
public	O
.	O
</s>
<s>
These	O
features	O
allow	O
NodeXL	B-Protocol
users	O
to	O
instantly	O
get	O
working	O
on	O
relevant	O
social	O
media	O
data	O
and	O
integrate	O
aspects	O
of	O
social	O
media	O
data	O
collection	O
and	O
analysis	O
into	O
a	O
single	O
tool	O
.	O
</s>
<s>
NodeXL	B-Protocol
workbooks	O
contain	O
four	O
worksheets	O
:	O
Edges	O
,	O
Vertices	O
,	O
Groups	O
,	O
and	O
Overall	O
Metrics	O
.	O
</s>
<s>
This	O
representation	O
allows	O
the	O
user	O
to	O
leverage	O
the	O
Excel	B-Application
spreadsheet	O
to	O
quickly	O
edit	O
existing	O
node	O
properties	O
and	O
to	O
generate	O
new	O
ones	O
,	O
for	O
instance	O
by	O
applying	O
Excel	B-Application
formulas	O
to	O
existing	O
columns	O
.	O
</s>
<s>
NodeXL	B-Protocol
Pro	O
contains	O
a	O
library	O
of	O
commonly	O
used	O
graph	O
metrics	O
:	O
centrality	O
,	O
clustering	O
coefficient	O
,	O
and	O
diameter	O
.	O
</s>
<s>
NodeXL	B-Protocol
differentiates	O
between	O
directed	O
and	O
undirected	O
networks	O
.	O
</s>
<s>
NodeXL	B-Protocol
Pro	O
implements	O
a	O
variety	O
of	O
community	O
detection	O
algorithms	O
to	O
allow	O
the	O
user	O
to	O
automatically	O
discover	O
clusters	O
in	O
their	O
social	O
networks	O
.	O
</s>
<s>
NodeXL	B-Protocol
generates	O
an	O
interactive	O
canvas	O
for	O
visualizing	O
graphs	O
.	O
</s>
<s>
The	O
project	O
allows	O
users	O
to	O
pick	O
from	O
several	O
well-known	O
Force-directed	B-Algorithm
graph	I-Algorithm
drawing	I-Algorithm
layout	B-Algorithm
algorithms	I-Algorithm
such	O
as	O
Fruchterman-Reingold	O
and	O
Harel-Koren	O
.	O
</s>
<s>
NodeXL	B-Protocol
allows	O
the	O
user	O
to	O
multi-select	O
,	O
drag	O
and	O
drop	O
nodes	O
on	O
the	O
canvas	O
and	O
to	O
manually	O
edit	O
their	O
visual	O
properties	O
(	O
size	O
,	O
color	O
,	O
and	O
opacity	O
)	O
.	O
</s>
<s>
In	O
addition	O
,	O
NodeXL	B-Protocol
enables	O
users	O
to	O
map	O
the	O
visual	O
properties	O
of	O
nodes	O
and	O
edges	O
to	O
metrics	O
it	O
calculates	O
,	O
and	O
in	O
general	O
to	O
any	O
column	O
in	O
the	O
edges	O
and	O
vertices	O
worksheet	O
.	O
</s>
<s>
NodeXL	B-Protocol
has	O
been	O
used	O
by	O
news	O
outlets	O
such	O
as	O
Foreign	O
Policy	O
to	O
visualize	O
the	O
structure	O
of	O
conversations	O
about	O
political	O
topics	O
as	O
well	O
as	O
by	O
organizations	O
like	O
the	O
World	O
Bank	O
to	O
analyze	O
voting	O
data	O
.	O
</s>
<s>
NodeXL	B-Protocol
has	O
been	O
used	O
as	O
an	O
analytical	O
tool	O
in	O
dozens	O
of	O
research	O
papers	O
in	O
the	O
social	O
,	O
information	O
,	O
and	O
computer	O
sciences	O
,	O
as	O
well	O
as	O
the	O
focus	O
of	O
research	O
in	O
humancomputer	O
interaction	O
,	O
data	B-Application
mining	I-Application
,	O
and	O
data	B-Application
visualization	I-Application
.	O
</s>
