cyclic_basis {basefun} | R Documentation |
Cyclic Basis Function
Description
The cyclic basis function for modelling seasonal effects
Usage
cyclic_basis(var, order = 3, frequency)
Arguments
var |
a |
order |
the order of the basis function |
frequency |
frequency |
Details
cyclic_basis
returns a set of sin and cosine functions for
modelling seasonal effects, see Held and Paul (2012), Section 2.2.
For any choice of coefficients, the function returns the same value
when evaluated at multiples of frequency
.
References
Leonhard Held and Michaela Paul (2012), Modeling Seasonality in Space-time Infectious Disease Surveillance Data, Biometrical Journal, 54(6), 824–843, doi:10.1002/bimj.201200037
Examples
### set-up basis
cb <- cyclic_basis(numeric_var("x"), order = 3, frequency = 2 * pi)
### generate data + coefficients
x <- data.frame(x = c(0, pi, 2 * pi))
### f(0) = f(2 * pi)
cb(x)
[Package basefun version 1.2-3 Index]