bmstdr (version 0.8.2)

phichoice_sp: Grid search method for choosing phi Calculates the validation statistics using the spatial model with a given range of values of the decay parameter phi.

Description

Grid search method for choosing phi Calculates the validation statistics using the spatial model with a given range of values of the decay parameter phi.

Usage

phichoice_sp(
  formula,
  data,
  coordtype,
  coords,
  phis,
  scale.transform,
  s,
  N,
  burn.in,
  verbose = TRUE,
  ...
)

Value

A data frame giving the phi values and the corresponding validation statistics

Arguments

formula

An object of class "formula" (or one that can be coerced to that class): a symbolic description of the model to be fitted.

data

The data frame for which the model formula is to be fitted. If a spatial model is to be fitted then the data frame should contain two columns containing the locations of the coordinates. See the coords argument below.

coordtype

Type of coordinates: utm, lonlat or plain with utm (supplied in meters) as the default. Distance will be calculated in units of kilometer if this argument is either utm or lonlat. Euclidean distance will be calculated if this is given as the third type plain. If distance in meter is to be calculated then coordtype should be passed on as plain although the coords are supplied in UTM.

coords

A vector of size two identifying the two column numbers of the data frame to take as coordinates. Or this can be given as a matrix of number of sites by 2 providing the coordinates of all the data locations.

phis

A vector values of phi

scale.transform

Transformation of the response variable. It can take three values: SQRT, LOG or NONE.

s

A vector giving the validation sites

N

MCMC sample size. Default value 5000.

burn.in

How many initial iterations to discard. Default value 1000. Only relevant for MCMC based model fitting, i.e., when package is spBayes or Stan.

verbose

Logical. Should it print progress?

...

Any additional parameter that may be passed to Bspatial

Examples

# \donttest{
a <- phichoice_sp(formula=yo3~xmaxtemp+xwdsp+xrh, data=nyspatial, 
coordtype="utm", coords=4:5, 
phis=seq(from=0.1, to=1, by=0.4), scale.transform="NONE", 
s=c(8,11,12,14,18,21,24,28), N=20, burn.in=10, verbose=TRUE)
# }