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"ZigZag Validity Indicator" 

Using additional indicators to confirm signals have merit but Spyros Raftopoulos's "ZigZag Validity Indicator" to "me" has limited value. As "system trading" is rules-based additional indicators can be used to identify trends, & confirm trends, to determine the timing of the entry, exit, & profit target points is a better use of your time. It is essential for every trader to be aware of the limitations of each indicator before using them in trading.

Trend confirming indicators

Although some indicators help identify a possible trade, it is likely to provide some false signals. That's why traders should use multiple indicators to confirm trends, & filter signals, thus reducing errors. Traders should also use stop loss & profit targets when trading. Doing so determines the risk-reward ratio before taking a trade which means there is a better chance of being profitable. Combining multiple trading systems is another of my favourites as it helps to reduce risk by building more robustness into the strategy.

Skate.