Visualize the time series decomposition with anomalies shown

Source: R/plot_anomaly_decomposition.R

Visualize the time series decomposition with anomalies shown

plot_anomaly_decomposition(
  data,
  ncol = 1,
  color_no = "#2c3e50",
  color_yes = "#e31a1c",
  alpha_dots = 1,
  alpha_circles = 1,
  size_dots = 1.5,
  size_circles = 4,
  strip.position = "right"
)

Arguments

data

A tibble or tbl_time object.

ncol

Number of columns to display. Set to 1 for single column by default.

color_no

Color for non-anomalous data.

color_yes

Color for anomalous data.

alpha_dots

Controls the transparency of the dots. Reduce when too many dots on the screen.

alpha_circles

Controls the transparency of the circles that identify anomalies.

size_dots

Controls the size of the dots.

size_circles

Controls the size of the circles that identify anomalies.

strip.position

Controls the placement of the strip that identifies the time series decomposition components.

Value

Returns a ggplot object.

Details

The first step in reviewing the anomaly detection process is to evaluate a single times series to observe how the algorithm is selecting anomalies. The plot_anomaly_decomposition() function is used to gain an understanding as to whether or not the method is detecting anomalies correctly and whether or not parameters such as decomposition method, anomalize method, alpha, frequency, and so on should be adjusted.

See also

plot_anomalies()

Examples


library(dplyr)
library(ggplot2)

data(tidyverse_cran_downloads)

tidyverse_cran_downloads %>%
    filter(package == "tidyquant") %>%
    ungroup() %>%
    time_decompose(count, method = "stl") %>%
    anomalize(remainder, method = "iqr") %>%
    plot_anomaly_decomposition()
#> frequency = 7 days
#> trend = 91 days