Exactly as Bob thought... there is much angst about TMA original (Norm) vs TMA True
Here is a definition of TMA (Triangular Moving Average):
http://daytrading.about.com/od/indicato ... ngular.htm
From earlier Forex Factory (FF) discussions, the TMA introduced by zznbrm was a 56 period LWMA (Linear Weighted Moving Average) with a double ATR envelope- 56LWMA+2ATR. An NRP (non-repainting) version of TMASlope was written by NeoTrader with some reverse engineering. And TMA has been popular ever since !
Though the article above mysteriously describes the TMA as responsive to changes, even though it is a smoothing of a moving average itself (i.e., the TMA is a double smoothed plot), the fact remains that TMA, like all tech indicators, is a lagging indicator. Perhaps TMA True, given further processing (and as Bob's pics on last page show), is even more lagging than TMA Original (Normal.) Just an unavoidable mathematical fact.
There are many other indis you can use for trend 'prediction' as Bob earlier mentioned. Suit your taste. The very basic and popular RSI is one with its 70/30 overbought/oversold levels. Another popular one is ADX , which actually gives better readings with its +DI and -DI components trending or crossing over each other. See
www.stockcharts.com > Chart School for RSI, ADX and others, including MACD, a dual trending/oscillating indicator. Stochastics, of course, give you OB/OS readings in otherwise 'ranging' markets in their various TFs, with the traditional 80/20 levels.
And Bollinger Bands depend upon statistical determinations (2 standard deviations settings contain 95% of all price movement, from an assumed normal distribution) of whether price action is about to change direction with penetrating the bands. Interestingly, while BB might be one of the very few leading indicators, BB itself is highly prone to whipsaws.
Then we have newish indicators like TMA (discussed here) and Trend Magic, and sooo many others. Not to forget techniques that depend upon price, not time (Range Bars fit in both categories.) In the end, it is probability, i.e., after a number of trades, you can come up with an estimate of win and loss ratio. But then this win/loss ratio changes with 'market conditions', one reason why we are looking at 10.3 'ranging' vs the older 10.2x 'trending' methods.
Which is why, on p.101, instead of getting too deep in these religious wars of which indi is better, I had talked about the need for choice of indicators (if possible) in any Indy/EA script planned.
The fact is that most concepts are relative. For example, a 'trend' could well be a 'range' in a different TF and vice versa. Both trends and ranges can be more or less volatile, another major idea (a market condition) that has taken off in stock and futures markets with options trading, and which retail forex needs to explore.
Importantly, we need to seek integrated tools that can allow us some experimentation without spending too much time, so we can focus on the goal- profitable trading.
Athar.