The Trend Detection Index (TDI) attempts to identify
starting and ending trends. Developed by M. H. Pee.
Usage
TDI(price, n = 20, multiple = 2)
Arguments
price
Price series that is coercible to xts or
matrix.
n
Number of periods to use.
multiple
Multiple used to calculate (2).
Value
A object of the same class as price or a matrix
(if try.xts fails) containing the columns:
[object Object],[object Object]
Details
The TDI is the (1) absolute value of the n-day sum
of the n-day momentum, minus the quantity of (2)
multiple*n-day sum of the absolute value of
the n-day momentum, minus (3) n-day sum of
the absolute value of the n-day momentum.
I.e. TDI = (1) - [ (2) - (3) ]
The direction indicator is the sum of the n-day
momentum over the last n days.
See URL in references section for further details.
References
The following site(s) were used to code/document this
indicator:
http://www.linnsoft.com/tour/techind/tdi.htm
See Also
See aroon, CCI,
ADX, VHF, GMMA
for other indicators that measure trend
direction/strength.