plot.dsn2 {sn} | R Documentation |
Produces a contour plot of the density function of a bivariate skew-normal variate
plot.dsn2(x, y, xi, Omega, alpha, ...)
x |
vector of values of the first component |
y |
vector of values of the second component |
xi |
a vector of length 2 containing the location parameter |
Omega |
a 2 by 2 matrix containing a covariance matrix |
alpha |
a vector of length 2 containing the shape parameter |
... |
additional parameters to be passed to contour
|
plot.dsn2
makes use of function dmsn
a list containing the original input parameters plus a matrix
containing the density function evaluated at the grid formed
by the x
and y
values
A contour plot is produced on the graphical window
The multivariate skew-normal distribution is discussed by
Azzalini and Dalla Valle (1996); the (Omega,alpha)
parametrization
adopted here is the one of Azzalini and Capitanio (1999).
Azzalini, A. and Dalla Valle, A. (1996). The multivariate skew-normal distribution. Biometrika 83, 715726.
Azzalini, A. and Capitanio, A. (1999). Statistical applications of the multivariate skew-normal distribution. J.Roy.Statist.Soc. B 61, 579602.
dmsn
,
x <- y <- seq(-4, 4,length=35) plot.dsn2(x, y, c(-1,2), diag(c(1,2.5)), c(2,-3))