<s>
In	O
statistics	O
and	O
econometrics	O
,	O
the	O
ADF-GLS	B-General_Concept
test	I-General_Concept
(	O
or	O
DF-GLS	B-General_Concept
test	I-General_Concept
)	O
is	O
a	O
test	O
for	O
a	O
unit	O
root	O
in	O
an	O
economic	O
time	O
series	O
sample	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
Elliott	O
,	O
Rothenberg	O
and	O
Stock	O
(	O
ERS	O
)	O
in	O
1992	O
as	O
a	O
modification	O
of	O
the	O
augmented	B-General_Concept
Dickey	I-General_Concept
–	I-General_Concept
Fuller	I-General_Concept
test	I-General_Concept
(	O
ADF	O
)	O
.	O
</s>
<s>
Working	O
with	O
would	O
result	O
in	O
power	O
gain	O
,	O
as	O
ERS	O
show	O
,	O
when	O
testing	O
the	O
stationarity	O
features	O
of	O
using	O
the	O
augmented	B-General_Concept
Dickey-Fuller	I-General_Concept
test	I-General_Concept
.	O
</s>
