Developed by Welles Wilder, the Swing Index seeks to isolate the "real" price of a security
by comparing the relationships between the current prices (i.e., open, high, low, and
close) and the previous period's prices.
The Swing Index is primarily used as a component of the
Accumulation Swing Index.
The following chart shows the British Pound and the Swing Index.
You can see that by
itself, the Swing Index is an erratic plot. The value of this indicator develops when it
is accumulated into the Accumulation Swing Index.
Although it is beyond the scope of this book to completely define the Swing Index, the
basic formula is shown below. Step-by-step instructions on calculating the Swing Index are
provided in Wilder's book,
New Concepts In Technical Trading Systems.
The following table lists the limit moves for several commodities. You can get a list
of limit moves from your broker.
You may need to adjust the limit moves shown in the above table based on the position of
the decimal in your data. For example, if the price of corn is quoted as $2.45, the limit
move would be $0.10. However, if the price of corn is quoted as $245.00, the limit move
would be $10.00.
If the security does not have a limit move (e.g., a stock or some futures), use an
extremely high value (e.g., $30,000).