Well, the only true answer to that question is “no”. Very few things in this world are 100% certain, and anything that is so certain is not going to be a sound basis for investment because it will never move in terms of value. As far as is possible, the most popular methods of data analysis within the Forex market can be very reliable and aid a profit strategy, but you must accept that they carry a certain risk. That risk is reduced the longer a period of data collection continues. However it is important to be aware that the lower the risk, the lower the potential reward becomes.

It is fair to say that any sound strategy needs to have a basis in data. The more data you have, the more comprehensive your strategy. You need to be aware at the point of investment however that there is a chance your strategy will fail, no matter how much data went into creating it. This does not mean the data was bad, just that on this occasion the market won.