[amibroker] Pad Non-trading Days Feature

["wavetrader2005" <wave-trader@xxxxxxxxxx>]

Hello TJ,

I've just tried out the "Pad non-trading days" feature in 5.26.5. When conducting a cycle analysis on daily data, it's important to account for all non-trading days and this feature is a step in the right direction.

However, as discussed in an earlier email, when adding the non-trading days, a linear interpolation calculation using median price ( (H+L/2) ) needs to be done to populate the price fields for those added days. Your current method of using just the closing price of the bar preceding the "gap" causes problems with the cycle indicators I use, as they require a linear interpolated median price to calculate on for the added non-trading days (otherwise they will plot incorrectly).

The linear interpolation is simple enough:
1. Take the difference between the median price of the bar preceding the gap and the bar subsequent to the gap.
2. Divide this difference by the number of days in the gap PLUS 1; so, for a two day gap, the divisor would be 3.
3. Add this result to the median price of the bar preceding the gap and use this value to populate the price field for the first gap; add this same result to the newly calculated price for the first gap price, and so on, until all gaps have a calculated price.

Could you change your current method over to this method so the cycle indicators will work correctly?

Regards,

David Preston
a.k.a. Wave~Trader



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