<s>
In	O
statistics	O
,	O
in	O
the	O
analysis	O
of	O
two-way	O
randomized	O
block	O
designs	O
where	O
the	O
response	O
variable	O
can	O
take	O
only	O
two	O
possible	O
outcomes	O
(	O
coded	O
as	O
0	O
and	O
1	O
)	O
,	O
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
is	O
a	O
non-parametric	B-General_Concept
statistical	O
test	O
to	O
verify	O
whether	O
k	O
treatments	O
have	O
identical	O
effects	O
.	O
</s>
<s>
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
should	O
not	O
be	O
confused	O
with	O
Cochran	B-General_Concept
's	I-General_Concept
C	I-General_Concept
test	I-General_Concept
,	O
which	O
is	O
a	O
variance	O
outlier	O
test	O
.	O
</s>
<s>
Put	O
in	O
simple	O
technical	O
terms	O
,	O
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
requires	O
that	O
there	O
only	O
be	O
a	O
binary	O
response	O
(	O
e.g.	O
</s>
<s>
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
assumes	O
that	O
there	O
are	O
k>2	O
experimental	O
treatments	O
and	O
that	O
the	O
observations	O
are	O
arranged	O
in	O
b	O
blocks	O
;	O
that	O
is	O
,	O
</s>
<s>
If	O
the	O
Cochran	O
test	O
rejects	O
the	O
null	O
hypothesis	O
of	O
equally	O
effective	O
treatments	O
,	O
pairwise	O
multiple	B-General_Concept
comparisons	I-General_Concept
can	O
be	O
made	O
by	O
applying	O
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
on	O
the	O
two	O
treatments	O
of	O
interest	O
.	O
</s>
<s>
Cochran	B-General_Concept
's	I-General_Concept
Q	I-General_Concept
test	I-General_Concept
is	O
based	O
on	O
the	O
following	O
assumptions	O
:	O
</s>
<s>
The	O
Friedman	B-General_Concept
test	I-General_Concept
or	O
Durbin	B-General_Concept
test	I-General_Concept
can	O
be	O
used	O
when	O
the	O
response	O
is	O
not	O
binary	O
but	O
ordinal	O
or	O
continuous	O
.	O
</s>
<s>
When	O
there	O
are	O
exactly	O
two	O
treatments	O
the	O
Cochran	B-General_Concept
Q	I-General_Concept
test	I-General_Concept
is	O
equivalent	O
to	O
McNemar	B-General_Concept
's	I-General_Concept
test	I-General_Concept
,	O
which	O
is	O
itself	O
equivalent	O
to	O
a	O
two-tailed	O
sign	B-General_Concept
test	I-General_Concept
.	O
</s>
