• If a future price mean falls right on the line, it will be exactly the same as the price mean that is subtracted from the left end of the previous day's span sum.
The new span sum will therefore be equal to the previous day's span sum, and the new moving-average data point will be exactly the same as the previous one.
• If the future price mean is above the line, it will be higher than the price mean that is subtracted from the left end of the previous day's span sum even though it may be lower than the previous day's price mean.
The new span sum will therefore be greater than the previous day's span sum, and the new moving-average data point will be higher than the previous one.
The new span sum will therefore be equal to the previous day's span sum, and the new moving-average data point will be exactly the same as the previous one.
• If the future price mean is above the line, it will be higher than the price mean that is subtracted from the left end of the previous day's span sum even though it may be lower than the previous day's price mean.
The new span sum will therefore be greater than the previous day's span sum, and the new moving-average data point will be higher than the previous one.
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