dtrend {transx} | R Documentation |
Deterministic Trend
Description
Remove global deterministic trend information from the series.
-
dt_lin
removes the linear trend. -
dt_quad
removes the quadratic trend. -
dt_poly
removes the nth-degree polynomial trend.
Usage
dtrend_lin(x, bp = NULL, na.rm = getOption("transx.na.rm"))
dtrend_quad(x, bp = NULL, na.rm = getOption("transx.na.rm"))
dtrend_poly(x, degree, bp = NULL, na.rm = getOption("transx.na.rm"))
Arguments
x |
Univariate vector, numeric or ts object with only one dimension. |
bp |
Break points to define piecewise segments of the data. |
na.rm |
A value indicating whether NA values should be stripped before the computation proceeds. |
degree |
Value indicating the degree of polynomial |
Value
Returns a vector with the same class and attributes as the input vector.
Examples
set.seed(123)
t <- 1:20
# Linear trend
x <- 3*sin(t) + t
plotx(cbind(x, dtrend_lin(x)))
# Quadratic trend
x2 <- 3*sin(t) + t + t^2
plotx(cbind(raw = x2, quad = dtrend_quad(x2)))
# Introduce a breaking point at point = 10
xbp <- 3*sin(t) + t
xbp[10:20] <- x[10:20] + 15
plotx(cbind(raw = xbp, lin = dtrend_lin(xbp), lin_bp = dtrend_lin(xbp, bp = 10)))
[Package transx version 0.0.1 Index]