snorm {VGAM} | R Documentation |
Density and random generation for the skew-normal distribution.
dsnorm(x, location = 0, scale = 1, shape = 0) rsnorm(n, location = 0, scale = 1, shape = 0)
x |
vector of quantiles. |
n |
number of observations. Must be a single positive integer. |
location |
The location parameter xi. A vector. |
scale |
The scale parameter w. A positive vector. |
shape |
The shape parameter. It is called alpha in
skewnormal1 .
|
See skewnormal1
, which currently only estimates the shape
parameter.
More generally here, Z = xi + w * Y where
Y has a standard skew-normal distribution (see skewnormal1
),
xi is the location parameter and
w is the scale parameter.
dsnorm
gives the density,
rsnorm
generates random deviates.
The default values of all three parameters corresponds to the skew-normal being the standard normal distribution.
T. W. Yee
http://tango.stat.unipd.it/SN.
## Not run: n = 200 # grid resolution shape = 7 x = seq(-4, 4, len=n) plot(x, dsnorm(x, shape=shape), type="l", col="blue", las=1, ylab="") abline(v=0, h=0, lty="dashed", col="darkgreen") lines(x, dnorm(x), col="red") legend(-3.5, 0.6, leg=c(paste("Blue=dsnorm(x, ", shape,")", sep=""), "standard normal density"), lty=1, col=c("blue","red")) ## End(Not run)