Rev Language Reference
dnHalfNormal - half-Normal Distribution
half-normal (gaussian) distribution with offset equal to ‘offset’ and standard deviation equal to ‘sd’.
Usage
Arguments
| offset : | Real (pass by const reference) |
| The offset parameter. | |
| sd : | RealPos (pass by const reference) |
| The standard deviation parameter. |
Domain Type
Details
The half-normal distribution has density:
f(x) = 2/(sqrt(2 pi) sigma) e^-((x - offset)^2/(2 sigma^2)) where offset is the offset of the distribution and sigma the standard deviation.
f(x) = 2/(sqrt(2 pi) sigma) e^-((x - offset)^2/(2 sigma^2))
where offset is the offset of the distribution and sigma the standard deviation.
Example
# we simulate some oversations
x <- rhalfNormal(n=10,offset=0,sd=10)
# let's see what the minimum is (you could do the max too)
# the minimum should never be less than the offset
min(x)
# let's also see what the mean and the variance are
mean(x)
var(x)
sd(x)
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