ts_velocity_vec: Vector Function Time Series Acceleration

In spsanderson/healthyR.ts: The Time Series Modeling Companion to 'healthyR'

Vector Function Time Series Acceleration

Description

Takes a numeric vector and will return the velocity of that vector.

Usage

ts_velocity_vec(.x)

Arguments

.x	A numeric vector

Details

Takes a numeric vector and will return the velocity of that vector. The velocity of a time series is computed by taking the first difference, so

x_t - x_t1

This function can be used on it's own. It is also the basis for the function ts_velocity_augment().

Value

A numeric vector

Author(s)

Steven P. Sanderson II, MPH

See Also

Other Vector Function: ts_acceleration_vec(), ts_growth_rate_vec()

Examples

suppressPackageStartupMessages(library(dplyr))

len_out    = 25
by_unit    = "month"
start_date = as.Date("2021-01-01")

data_tbl <- tibble(
  date_col = seq.Date(from = start_date, length.out = len_out, by = by_unit),
  a    = rnorm(len_out),
  b    = runif(len_out)
)

vec_1 <- ts_velocity_vec(data_tbl$b)

plot(data_tbl$b)
lines(data_tbl$b)
lines(vec_1, col = "blue")

spsanderson/healthyR.ts documentation built on Jan. 19, 2024, 10:02 p.m.