<s>
In	O
trading	O
strategy	O
,	O
news	O
analysis	O
refers	O
to	O
the	O
measurement	O
of	O
the	O
various	O
qualitative	O
and	O
quantitative	O
attributes	O
of	O
textual	O
(	O
unstructured	B-Application
data	I-Application
)	O
news	O
stories	O
.	O
</s>
<s>
News	B-General_Concept
analytics	I-General_Concept
are	O
usually	O
derived	O
through	O
automated	O
text	O
analysis	O
and	O
applied	O
to	O
digital	O
texts	O
using	O
elements	O
from	O
natural	B-Language
language	I-Language
processing	I-Language
and	O
machine	O
learning	O
such	O
as	O
latent	O
semantic	O
analysis	O
,	O
support	B-Algorithm
vector	I-Algorithm
machines	I-Algorithm
,	O
"	O
bag	B-General_Concept
of	I-General_Concept
words	I-General_Concept
"	O
among	O
other	O
techniques	O
.	O
</s>
<s>
News	B-General_Concept
analytics	I-General_Concept
and	O
news	B-General_Concept
sentiment	I-General_Concept
calculations	O
are	O
now	O
routinely	O
used	O
by	O
both	O
buy-side	O
and	O
sell-side	O
in	O
alpha	O
generation	O
,	O
trading	O
execution	O
,	O
risk	O
management	O
,	O
and	O
market	O
surveillance	O
and	O
compliance	O
.	O
</s>
<s>
Provided	O
a	O
set	O
of	O
values	O
such	O
as	O
sentiment	O
and	O
relevance	O
as	O
well	O
as	O
the	O
frequency	O
of	O
news	O
arrivals	O
,	O
it	O
is	O
possible	O
to	O
construct	O
news	B-General_Concept
sentiment	I-General_Concept
scores	O
for	O
multiple	O
asset	O
classes	O
such	O
as	O
equities	O
,	O
Forex	O
,	O
fixed	O
income	O
,	O
and	O
commodities	O
.	O
</s>
<s>
Scenario	O
:	O
The	O
gap	O
between	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
scores	O
for	O
direction	O
,	O
,	O
of	O
Company	O
and	O
Market	O
has	O
moved	O
beyond	O
.	O
</s>
<s>
Exit	O
Strategy	O
:	O
When	O
the	O
gap	O
in	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
scores	O
for	O
direction	O
of	O
Company	O
and	O
Market	O
has	O
disappeared	O
,	O
=	O
,	O
sell	O
the	O
stock	O
on	O
Company	O
and	O
go	O
long	O
the	O
future	O
on	O
Market	O
to	O
close	O
the	O
positions	O
.	O
</s>
<s>
Scenario	O
:	O
The	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
volatility	O
of	O
Company	O
goes	O
above	O
out	O
of	O
indicating	O
an	O
expected	O
volatility	O
above	O
the	O
option	O
implied	O
volatility	O
.	O
</s>
<s>
Scenario	O
:	O
The	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
direction	O
of	O
Company	O
goes	O
above	O
out	O
of	O
.	O
</s>
<s>
Exit	O
Strategy	O
:	O
When	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
direction	O
of	O
Company	O
falls	O
below	O
,	O
sell	O
the	O
stock	O
on	O
Company	O
to	O
close	O
the	O
position	O
.	O
</s>
<s>
Scenario	O
:	O
The	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
direction	O
of	O
Sector	O
goes	O
above	O
out	O
of	O
.	O
</s>
<s>
Exit	O
Strategy	O
:	O
When	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
direction	O
of	O
Sector	O
falls	O
below	O
,	O
remove	O
the	O
tactical	O
bet	O
for	O
Sector	O
from	O
the	O
asset	O
allocation	O
model	O
.	O
</s>
<s>
Action	O
:	O
Estimate	O
the	O
portfolio	O
covariance	O
matrix	O
taking	O
into	O
account	O
the	O
development	O
of	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
volume	O
.	O
</s>
<s>
Action	O
:	O
Estimate	O
the	O
portfolio	O
covariance	O
matrix	O
taking	O
into	O
account	O
the	O
development	O
of	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
volume	O
.	O
</s>
<s>
Action	O
:	O
Scale	O
the	O
daily	O
volume	O
distribution	O
for	O
Company	O
applied	O
in	O
the	O
algorithmic	O
trading	O
system	O
,	O
thus	O
taking	O
into	O
account	O
the	O
news	B-General_Concept
sentiment	I-General_Concept
score	O
for	O
volume	O
.	O
</s>
