| Note
that we provide the 10-day, 30-day and 60-day historical
volatilities for each index, just
as we do for each stock - right on the list. This
allows you to compare the stock's recent volatility
over several time periods to that of the relevant
indices. Historical volatility is a measure of how
much price has deviated from the average price over
a period of time: 10 days, 30 days, etc.
Historical
volatility, actual volatility, realized volatility,
real volatility, stock volatility and price volatility
all mean the same thing.
Comparing Indices
The first
thing I do on opening the MM List is to view the MADI
values for the major indices. Then I sort the lists
by MADI. I want to see what the major indices are
doing and then how the industry indices compare. Next
I sort the list by the 30-day volatility and look
also at the 10-day volatilities.
For example,
a scan of the MM List showed the following volatilities,
picked at random.
| Stock/Index |
Sym. |
10-day
Vol.* |
30-day
Vol. |
60-day
Vol. |
| CBOE
DJ Industrial Average |
DJX |
15.74% |
13.94% |
13.71% |
| S&P
500 Index |
SPX |
16.70% |
16.38% |
16.05% |
| ISE-CCM
Alternative Energy Index |
POW |
29.44% |
29.40% |
30.02% |
| ISE
US Regional Banks Index |
JLO |
43.49% |
37.22% |
39.66% |
| *Markets
had been pulling back for a couple of weeks from
top trend line, DOW had lost about 200 points.
|
The major
indices usually have the lowest volatility readings.
Again, I want to know how volatile different industries
are compared to major indices. At the time this table
was prepared, the market had been pulling back for
a couple of weeks after touching the top trend line
of its trading range. DJX 10-day volatility increased
nearly 2 percentage points over the 30-day number.
It's only two points, but about a 135% increase in
volatility (from 13.94 to 15.74).
Note how
much more volatile than the market both JLO
and POW
were. JLO was nearly 3x as volatile as the DJX at
this time. When an index's volatility is quite high
compared to the major indices, you can bet that many
of the covered call plays in that industry are even
higher.
Comparing Stock to Index
Note in
the table below how two of the leading stocks in the
Oil Services Service industry compare to the relevant
index. We can compare it absolutely
(number against number) and compare the volatility
trend - is the trend flat, up, down,
all over the map?
| Stock/Index |
Sym. |
10-day
Vol. |
30-day
Vol. |
60-day
Vol. |
| PHLX
Oil Services Sector Index |
OSX |
28.88% |
26.55% |
28.94% |
| Baker
Hughes Inc. |
BHI |
32.53% |
35.28% |
44.77% |
| Smith
International |
SII |
45.63% |
44.22% |
46.24% |
| Superior
Energy Services |
SPN |
51.44% |
45.98% |
48.36% |
All the
stocks show higher volatility than the index, yet
BHI's volatility has been steadily falling. The volatility
of SII and SPN has stayed about the same, rising in
the last couple of weeks - as has the index. In terms
of actual price volatility, BHI is trending down,
SII, SPNand the index are essentially holding steady.
All things
being equal, it is reassuring that a stock's volatility
is not too out of line with that of the index (BHI)
and that the stock's volatility trend is as good or
better than the index (BHI and SII). If it really
is out of line, we have to wonder why. It is good
if a stock's volatility is lower than that of the
relevant index or the major indices, all else being
equal.
Be careful
of an uptrend in recent volatility, unless it is relatively
minor - less than 15% or so. For example, SPN has
a slight volatility uptrend going on, but it is minor.
Be especially careful of a spike in the 10-day volatility. |