<s>
G*Power	B-Algorithm
is	O
a	O
free-to	O
use	O
software	O
used	O
to	O
calculate	O
statistical	B-General_Concept
power	I-General_Concept
.	O
</s>
<s>
The	O
program	O
offers	O
the	O
ability	O
to	O
calculate	O
power	O
for	O
a	O
wide	O
variety	O
of	O
statistical	O
tests	O
including	O
t-tests	B-General_Concept
,	O
F-tests	B-General_Concept
,	O
and	O
chi-square-tests	B-General_Concept
,	O
among	O
others	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
user	O
must	O
determine	O
which	O
of	O
the	O
many	O
contexts	O
this	O
test	O
is	O
being	O
used	O
,	O
such	O
as	O
a	O
one-way	B-General_Concept
ANOVA	I-General_Concept
versus	O
a	O
multi-way	B-General_Concept
ANOVA	I-General_Concept
.	O
</s>
<s>
In	O
order	O
to	O
calculate	O
power	O
,	O
the	O
user	O
must	O
know	O
four	O
of	O
five	O
variables	O
:	O
either	O
number	O
of	O
groups	O
,	O
number	O
of	O
observations	O
,	O
effect	B-Application
size	I-Application
,	O
significance	B-General_Concept
level	I-General_Concept
( α	O
)	O
,	O
or	O
power	O
(	O
1-β	O
)	O
.	O
</s>
<s>
G*Power	B-Algorithm
has	O
a	O
built-in	O
tool	O
for	O
determining	O
effect	B-Application
size	I-Application
if	O
it	O
cannot	O
be	O
estimated	O
from	O
prior	O
literature	O
or	O
is	O
not	O
easily	O
calculable	O
.	O
</s>
