This is just one methodology to determine trend - there are many others but something PA based is always preferable.
Ive always found it remarkably difficult to determine trend using simple indicators, which perhaps isnt that suprising really. Ive even heard it argued that trends do not actually exist ! although I'd argue that you can prove they do with some fairly basic statistical analysis.
I remember years ago taking a bunch of completely random trades, and of course if you analyse the data retrospectively, you find that if the markets trending up, most of your buy trades tend to do well, and your sell trades dont do so well, and vice versa. On that basis you conclude that if you could just measure "the trend" then you can make money tossing coins (and of course you can).
I remember duckfu once saying that by definition, we are always trying to exploit some trend somwhere, if we buy, we want it to go up, and if we sell we want it to go down, and although he's right, and this seams like a sensible approach, and an approach that certainly works, I'm not 100% sure that its the optimum way of going about things !
I've spent most of this year working on strategies that dont incorporate any analysis of trend at all, and it certainly seamed to be a much easier thing to do than developing a trend based method.
Just out of interest, do you tend to get a 50/50 distribution of long and short trades over a year, with similar returns from each, or do you get asymetrical results with one side taking more trades or doing far better ?