center_l_function — center_l_function • onpoint

Centered L-function

Usage

center_l_function(x, ...)

Arguments

x: ppp
...: Arguments passed to spatstat.explore::Lest()

Value

fv.object

Details

Centers Besag's L-function to zero by calculating L(r) -r. Centering the L-function allows an easier interpretation and plotting of the results (Haase 1995).

Returns an 'Function value object' of the spatstat package.

References

Besag, J.E., 1977. Discussion on Dr. Ripley’s paper. Journal of the Royal Statistical Society. Series B (Methodological) 39, 193–195. <https://doi.org/10.1111/j.2517-6161.1977.tb01616.x>

Ripley, B.D., 1977. Modelling spatial patterns. Journal of the Royal Statistical Society. Series B (Methodological) 39, 172–192. <https://doi.org/10.1111/j.2517-6161.1977.tb01615.x>

Haase, P., 1995. Spatial pattern analysis in ecology based on Ripley’s K-function: Introduction and methods of edge correction. Journal of Vegetation Science 6, 575–582. <https://doi.org/10.2307/3236356>

See also

Examples

input_pattern <- spatstat.random::runifpoint(n = 100)
center_l_function(input_pattern, correction = "Ripley")
#> Function value object (class ‘fv’)
#> for the function r -> L(r)-r
#> ............................................................
#>      Math.label       Description                           
#> r    r                distance argument r                   
#> theo L[pois](r)-r     theoretical Poisson L(r)-r            
#> iso  hat(L)[iso](r)-r isotropic-corrected estimate of L(r)-r
#> ............................................................
#> Default plot formula:  .~.x
#> where “.” stands for ‘iso’, ‘theo’
#> Recommended range of argument r: [0, 0.25]
#> Available range of argument r: [0, 0.25]

lest <- spatstat.explore::Lest(input_pattern)
center_l_function(lest)
#> Function value object (class ‘fv’)
#> for the function r -> L(r)-r
#> ..................................................................
#>        Math.label         Description                             
#> r      r                  distance argument r                     
#> theo   L[pois](r)-r       theoretical Poisson L(r)-r              
#> border hat(L)[bord](r)-r  border-corrected estimate of L(r)-r     
#> trans  hat(L)[trans](r)-r translation-corrected estimate of L(r)-r
#> iso    hat(L)[iso](r)-r   isotropic-corrected estimate of L(r)-r  
#> ..................................................................
#> Default plot formula:  .~.x
#> where “.” stands for ‘iso’, ‘trans’, ‘border’, ‘theo’
#> Recommended range of argument r: [0, 0.25]
#> Available range of argument r: [0, 0.25]