cor_exp | R Documentation |
Calculate exponential correlation
cor_exp(x, c, gamma = 1/2, nugget = 0, is.dist = FALSE)
x |
A numeric vector, matrix, or array. |
c |
Smooth parameter, |
gamma |
Scale parameter, |
nugget |
The nugget effect |
is.dist |
Logical; if TRUE, |
The exponential correlation function with scale parameter c
and smooth parameter \gamma
has the form
C(x)=(1-\text{nugget})\exp(-c|x|^{2\gamma})+\text{nugget}\cdot
\delta_{x=0},
where \delta_{x=0}
is 1 when x=0
and 0 otherwise.
Correlations of the same dimension as x
.
Diggle, P. J., Tawn, J. A., & Moyeed, R. A. (1998). Model-Based Geostatistics. Journal of the Royal Statistical Society. Series C (Applied Statistics), 47(3), 299–350.
Other correlation functions:
cor_cauchy()
,
cor_fs()
,
cor_lagr_askey()
,
cor_lagr_exp()
,
cor_lagr_tri()
,
cor_sep()
,
cor_stat()
,
cor_stat_rs()
x <- matrix(c(0, 5, 5, 0), nrow = 2)
cor_exp(x, c = 0.01, gamma = 0.5)
x <- matrix(c(0, 5, 5, 0), nrow = 2)
cor_exp(x, c = 0.01, gamma = 0.5, nugget = 0.3, is.dist = TRUE)
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