The Trend Detection Index (TDI) attempts to identify starting and ending trends.
Developed by M. H. Pee.
Usage
TDI(price, n = 20)
Arguments
price
Price series to use.
n
Number of periods to use.
Value
A matrix containing the columns:
tdiThe Trend Detection Index.
diThe Direction Indicator.
Details
The TDI is the (1) absolute value of the n-day sum of the n-day momentum,
minus the quantity of (2) 2*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
for other indicators that measure trend direction/strength.