<s>
COBWEB	B-Algorithm
is	O
an	O
incremental	O
system	O
for	O
hierarchical	O
conceptual	B-Algorithm
clustering	I-Algorithm
.	O
</s>
<s>
COBWEB	B-Algorithm
was	O
invented	O
by	O
Professor	O
Douglas	O
H	O
.	O
Fisher	O
,	O
currently	O
at	O
Vanderbilt	O
University	O
.	O
</s>
<s>
COBWEB	B-Algorithm
incrementally	O
organizes	O
observations	O
into	O
a	O
classification	B-Algorithm
tree	I-Algorithm
.	O
</s>
<s>
Each	O
node	O
in	O
a	O
classification	B-Algorithm
tree	I-Algorithm
represents	O
a	O
class	O
(	O
concept	O
)	O
and	O
is	O
labeled	O
by	O
a	O
probabilistic	O
concept	O
that	O
summarizes	O
the	O
attribute-value	O
distributions	O
of	O
objects	O
classified	O
under	O
the	O
node	O
.	O
</s>
<s>
This	O
classification	B-Algorithm
tree	I-Algorithm
can	O
be	O
used	O
to	O
predict	O
missing	O
attributes	O
or	O
the	O
class	O
of	O
a	O
new	O
object	O
.	O
</s>
<s>
There	O
are	O
four	O
basic	O
operations	O
COBWEB	B-Algorithm
employs	O
in	O
building	O
the	O
classification	B-Algorithm
tree	I-Algorithm
.	O
</s>
<s>
Which	O
operation	O
is	O
selected	O
depends	O
on	O
the	O
category	B-General_Concept
utility	I-General_Concept
of	O
the	O
classification	O
achieved	O
by	O
applying	O
it	O
.	O
</s>
<s>
Passing	O
an	O
object	O
down	O
the	O
hierarchy	O
Effectively	O
calling	O
the	O
COBWEB	B-Algorithm
algorithm	O
on	O
the	O
object	O
and	O
the	O
subtree	O
rooted	O
in	O
the	O
node	O
.	O
</s>
<s>
COBWEB(root, record )	O
:	O
</s>
<s>
calculate	O
Category	B-General_Concept
Utility	I-General_Concept
for	O
insert(record, child )	O
,	O
</s>
