despike builtin

despike(coords, values, *, radii=None, seed=0)

Breaks ties in values before a normal-score transform.

Tied samples, such as those at a detection limit, are ranked on the average over their neighborhood of each sample's rank, within each radius in turn, then on a seeded random draw. Several variables share one ordering: the averaged rank is the mean over the variables.

Parameters:

Name	Type	Description	Default
coords	(array_like, PointSet or BlockModel)	(n, 2) or (n, 3) sample coordinates, or a container.	required
values	array_like, str or list of str	(n,) values, (n, k) values of k variables, or column names of coords.	required
radii	sequence of float	Neighborhood radii, used smallest first. Defaults to 1, 2, 4 and 8 times the median distance to the nearest sample.	None
seed	int	Seed of the last-resort random tie-break.	0

Returns:

Type	Description
ndarray or Table	The values with each tie spread over tiny increasing offsets (at most 1e-4 of the gap to the next value) in rank order, so no ties remain and untied values keep their order. A Table when values are names.

used in

• despiking
• spatial bootstrap
• multigaussian kriging