psmd_spade {gdverse}R Documentation

power of spatial and multilevel discretization determinant(PSMD)

Description

Function for calculate power of spatial and multilevel discretization determinant PSMDQ_s.

Usage

psmd_spade(
  formula,
  data,
  wt = NULL,
  locations = NULL,
  discnum = NULL,
  discmethod = NULL,
  cores = 1,
  seed = 123456789,
  ...
)

Arguments

formula

A formula of calculate power of spatial and multilevel discretization determinant PSMDQ_s.

data

A data.frame or tibble of observation data.

wt

(optional) The spatial weight matrix. When wt is not provided, must provide locations, then gdverse will use locations columns to construct spatial weight use inverse_distance_weight().

locations

(optional) The geospatial locations coordinate columns name which in data. Useful and must provided when wt is not provided.

discnum

(optional) Number of multilevel discretization.Default will use 3:22.

discmethod

(optional) The discretization methods. Default will use quantile. If discmethod is set to robust, the function robust_disc() will be used. Conversely, if discmethod is set to rpart, the rpart_disc() function will be used. Others use st_unidisc(). Currently, only one discmethod can be used at a time.

cores

(optional) A positive integer(default is 1). If cores > 1, use parallel computation.

seed

(optional) Random seed number, default is 123456789.

...

(optional) Other arguments passed to st_unidisc(),robust_disc() or rpart_disc().

Details

The power of spatial and multilevel discretization determinant formula is PSMDQ_s = MEAN(Q_s)

Value

A value of power of spatial and multilevel discretization determinant PSMDQ_s.

Author(s)

Wenbo Lv lyu.geosocial@gmail.com

References

Xuezhi Cang & Wei Luo (2018) Spatial association detector (SPADE),International Journal of Geographical Information Science, 32:10, 2055-2075, DOI: 10.1080/13658816.2018.1476693

Examples

data('sim')
psmd_spade(y ~ .,
           data = dplyr::select(sim,1:4),
           locations = c('lo','la'))


[Package gdverse version 1.0.0 Index]