<s>
Chi-square	B-General_Concept
automatic	I-General_Concept
interaction	I-General_Concept
detection	I-General_Concept
(	O
CHAID	B-General_Concept
)	O
is	O
a	O
decision	B-Algorithm
tree	I-Algorithm
technique	O
based	O
on	O
adjusted	O
significance	O
testing	O
(	O
Bonferroni	B-General_Concept
correction	I-General_Concept
,	O
Holm-Bonferroni	B-General_Concept
testing	I-General_Concept
)	O
.	O
</s>
<s>
CHAID	B-General_Concept
can	O
be	O
used	O
for	O
prediction	O
(	O
in	O
a	O
similar	O
fashion	O
to	O
regression	O
analysis	O
,	O
this	O
version	O
of	O
CHAID	B-General_Concept
being	O
originally	O
known	O
as	O
XAID	O
)	O
as	O
well	O
as	O
classification	O
,	O
and	O
for	O
detection	O
of	O
interaction	O
between	O
variables	O
.	O
</s>
<s>
CHAID	B-General_Concept
is	O
based	O
on	O
a	O
formal	O
extension	O
of	O
AID	O
(	O
Automatic	O
Interaction	O
Detection	O
)	O
and	O
THAID	B-General_Concept
(	O
THeta	O
Automatic	O
Interaction	O
Detection	O
)	O
procedures	O
of	O
the	O
1960s	O
and	O
1970s	O
,	O
which	O
in	O
turn	O
were	O
extensions	O
of	O
earlier	O
research	O
,	O
including	O
that	O
performed	O
by	O
Belson	O
in	O
the	O
UK	O
in	O
the	O
1950s	O
.	O
</s>
<s>
A	O
history	O
of	O
earlier	O
supervised	O
tree	O
methods	O
together	O
with	O
a	O
detailed	O
description	O
of	O
the	O
original	O
CHAID	B-General_Concept
algorithm	O
and	O
the	O
exhaustive	O
CHAID	B-General_Concept
extension	O
by	O
Biggs	O
,	O
De	O
Ville	O
,	O
and	O
Suen	O
,	O
can	O
be	O
found	O
in	O
Ritschard	O
.	O
</s>
<s>
In	O
practice	O
,	O
CHAID	B-General_Concept
is	O
often	O
used	O
in	O
the	O
context	O
of	O
direct	O
marketing	O
to	O
select	O
groups	O
of	O
consumers	O
to	O
predict	O
how	O
their	O
responses	O
to	O
some	O
variables	O
affect	O
other	O
variables	O
,	O
although	O
other	O
early	O
applications	O
were	O
in	O
the	O
fields	O
of	O
medical	O
and	O
psychiatric	O
research	O
.	O
</s>
<s>
Like	O
other	O
decision	O
trees	O
,	O
CHAID	B-General_Concept
's	O
advantages	O
are	O
that	O
its	O
output	O
is	O
highly	O
visual	O
and	O
easy	O
to	O
interpret	O
.	O
</s>
<s>
One	O
important	O
advantage	O
of	O
CHAID	B-General_Concept
over	O
alternatives	O
such	O
as	O
multiple	O
regression	O
is	O
that	O
it	O
is	O
non-parametric	O
.	O
</s>
