Time-series Sum for the first Minutes/Hours of a Trading Day

This trading indicator has the same parameters as the Price at a specific Intraday Time item I have shared yesterday. However, instead of getting a time-series value at a specific bar, this indicator calculates, for the specified price series/indicator, the sum of all bars that occurred before a given time.

For example, the following formula (YTimeSum(volume, 10, 30)) gets the total volume that occurred before 10:30. The result is available in bars starting from 10:30, while previous bars get a NAN or Not a Number value.

Even if this function returns the sum of the provided array, you can get the average value by dividing this sum by the number of trading bars that are available before the specified intraday time. If you are using a 15 minutes time-frame then to get the average volume before 10:30, simply divide the above formula by 4 (There are 4 trading bars between 9:30 and 10:30).

Here is a very good example that illustrates the power of this indicator. The formula below calculates the ratio of the today's first hour volume to yesterday's first hour volume. The higher the value is the higher today's volume (first trading hour) is compared to yesterday's volume.

todVolume = YTimeSum(volume, 10, 30);
yesVolume = iff(RemoveSameSignals(iff(NaNtoZero(todVolume, 1) == 0, 0, 1)) == 1, NaNtoZero(todVolume, 1), 0);
yesVolume = ValueWhen(yesVolume != 0, yesVolume, 2);
ratio = todVolume / yesVolume;

Yesterday's volume is calculated by transforming NaN values to zero. After that excessive signals are removed so that we can use the "ValueWhen" function to get the previous volume sum value. You can update the last parameter (2) in the "ValueWhen" function to get volume for previous days.

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