This is a response to a PM.
I have tried to be a bit ambiguous in terms of trend definition because there are numerous ways to define a trend. For example, an up trend can be defined as a series of higher highs and higher lows, or it could be defined as price being above a moving average. One can also define an up trend occurring when a certain stochastic measures 50 or above.
There may be as many ways as there are traders. But the question always becomes, "What's the best/correct way?" The answer is the best/correct way is the way that resonates with the trader the most. Ultimately, We all trade our own belief systems. Accordingly, that which best fits your belief system is going to suit you better than something that doesn't.
With that being said, a reasonable starting point would be with a 20 EMA of the midpoint. Keep it simple, stupid. Long above and short below. Therefore, price is in an up trend above the EMA and price is in a down trend when price is below the EMA.
Attached Image (click to enlarge)
Take a look at the chart above. Now we have some really clear evidence of when and where we want to be looking to get Long. We placed a trigger matrix on the highest volume bar. Even though the next bar is down, we still see evidence of demand in the first bar. The second bar is clearly effort vs result- its got almost as much volume but nearly half the range. Something must be compressing price. Demand.
With Strength in the background, we want to get long above the 50% line (mean threshold). We also want to get long when price is above the EMA.
Without VSA, you're playing checkers while the Smart Money plays chess.