nkde_worker_bw_sel: Bandwidth selection by likelihood cross validation worker...

In spNetwork: Spatial Analysis on Network

Bandwidth selection by likelihood cross validation worker function

Description

worker function for calculating for multiple bandwidth the cross validation likelihood to select an appropriate bandwidth in a data-driven approach

Usage

nkde_worker_bw_sel(
  lines,
  quad_events,
  events_loc,
  events,
  w,
  kernel_name,
  bws_net,
  method,
  div,
  digits,
  tol,
  sparse,
  max_depth,
  zero_strat = "min_double",
  verbose = FALSE,
  cvl = FALSE
)

Arguments

lines	A feature collection of linestrings representing the underlying network
quad_events	a feature collection of points indicating for which events the densities must be calculated
events_loc	A feature collection of points representing the location of the events
events	A feature collection of points representing the events. Multiple events can share the same location. They are linked by the goid column
w	A numeric matrix with the weight of the events for each bandwdith
kernel_name	The name of the kernel to use (string)
bws_net	A numeric vector with the network bandwidths
method	The type of NKDE to use (string)
digits	The number of digits to retain from the spatial coordinates. It ensures that topology is good when building the network. Default is 3. Too high a precision (high number of digits) might break some connections
tol	A float indicating the minimum distance between the events and the lines' extremities when adding the point to the network. When points are closer, they are added at the extremity of the lines.
sparse	A Boolean indicating if sparse or regular matrices should be used by the Rcpp functions. These matrices are used to store edge indices between two nodes in a graph. Regular matrices are faster, but require more memory, in particular with multiprocessing. Sparse matrices are slower (a bit), but require much less memory.
zero_strat	A string indicating what to do when density is 0 when calculating LOO density estimate for an isolated event. "min_double" (default) replace the 0 value by the minimum double possible on the machine. "remove" will remove them from the final score. The first approach penalizes more strongly the small bandwidths.
verbose	A boolean
cvl	A boolean indicating if the cvl method (TRUE) or the loo (FALSE) method must be used

Examples

# no example provided, this is an internal function

spNetwork documentation built on Aug. 24, 2023, 5:10 p.m.