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That is the formula for the DRF (Daily Raw Figure) which matches what I have in Perry Kaufman’s Trading Systems book.
Remember the distinction between the Breadth Advance Decline line and this AD Oscillator. It may be that the other trading apps are showing a breadth measure rather than this TA Indicator.
Bottom line. Your script is right and it matches what we have for the Williams Advance Decline indicator.
All the best