Hi Justin,

Thank you for the kind words!

Yes, p is the observation/data point being scored as an outlier. P is scored relative to its nearest neighbor -- a set of data points referred to as o. Perhaps "o" should have a subscript in the equation for clarity. Elements "o" are drawn from the k-nearest neighbors of P.

Put another way, reachability distance is a type of distance between two points, p and o. It is not symmetric (reach-dist(p, o) != reach-dist(o, p)).

I hope this helps clarify your understanding.

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Data scientist working in the financial services industry

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Alexandra Amidon

Alexandra Amidon

Data scientist working in the financial services industry

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