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A Gap occurs when the price of a stock or any other security moves up or down with few trading in between. Gap Up is defined as a stock price with a today's low that is higher than yesterday's high and the opposite for the Gap Down; stock price with a today's high that is lower than yesterday's low.
There are many reasons that could lead to gaps in a financial asset. Both technical and fundamental factors could make the stock or the financial asset jump leaving gaps behind it. For example, earnings almost always force a stock to gap up or gap down if the company's earnings are much higher or much lower than what traders, investors and analysts expected.
After a gap, the stock price may continue its rally or decline or it may move back to the pre-gap price level. When this happens, we say that the gap has been filled. Most of the time gaps are filled.
This trading indicator signals bars where a gap up has been filled. It also returns the number of days since the last gap up, that is, the number of days that took the stock or security to fill its gap up.
Here is an example of a trading rule that returns a signal if a gap filling occur and if it took the security between 10 and 30 trading bars to fill the gap up:
GapUpFilled() >= 10 and GapUpFilled() <=30
Last Gap Up/Gap Down Price Size is another trading indicator I have shared. It returns the gap up or gap down size, that is, the difference between the high and the low of the gap.
You can use both functions to retrieve the gap size on the bar where the gap has been filled:
iff(GapUpFilled() > 0, ref(GapSize(0), GapUpFilled()), 0)
In order for the above line to work properly, you must make a small change to the GapSize function so it doesn't return a value when a gap down occurs.
Trading financial instruments, including foreign exchange on margin, carries a high level of risk and is not suitable for all investors. The high degree of leverage can work against you as well as for you. Before deciding to invest in financial instruments or foreign exchange you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with trading and seek advice from an independent financial advisor if you have any doubts.