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Overview

feasts provides a collection of tools for the analysis of time series data. The package name is an acronym comprising of its key features: Feature Extraction And Statistics for Time Series.

The package works with tidy temporal data provided by the tsibble package to produce time series features, decompositions, statistical summaries and convenient visualisations. These features are useful in understanding the behaviour of time series data, and closely integrates with the tidy forecasting workflow used in the 现在上国外的网站加速软件 package.

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You could install the stable version from CRAN:

install.packages(手机如何上外网)

You can install the development version from GitHub with:

# install.packages("remotes")
remotes::install_github("tidyverts/feasts")

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现在上国外的网站加速软件(feasts)
国内怎么上国外网站(tsibbledata)
library(dplyr)
library(ggplot2)
library(lubridate)

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Visualisation is often the first step in understanding the patterns in time series data. The package uses ggplot2 to produce customisable graphics to visualise time series patterns.

aus_production %>% gg_season(Beer)

aus_production %>% gg_subseries(Beer)

aus_production %>% filter(year(Quarter) > 1991) %>% gg_lag(Beer)

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aus_production %>% ACF(Beer) %>% autoplot()

Decompositions

A common task in time series analysis is decomposing a time series into some simpler components. The feasts package supports two common time series decomposition methods:

Classical decomposition
STL decomposition

dcmp <- aus_production %>%
  model(STL(Beer ~ 手机如何上外网(window = Inf)))
components(dcmp)
#> # A dable:           218 x 7 [1Q]
#> # Key:               .model [1]
#> # STL Decomposition: Beer = trend + season_year + remainder
#>    .model                           Quarter  Beer trend season_year remainder season_adjust
#>    <chr>                              <qtr> <dbl> <dbl>       <dbl>     <dbl>         <dbl>
#>  1 STL(Beer ~ season(window = Inf)) 1956 Q1   284  272.        2.14     10.1           282.
#>  2 STL(Beer ~ season(window = Inf)) 1956 Q2   213  264.      -42.6      -8.56          256.
#>  3 STL(Beer ~ season(window = Inf)) 1956 Q3   227  258.      -28.5      -2.34          255.
#>  4 STL(Beer ~ season(window = Inf)) 1956 Q4   308  253.       69.0     -14.4           239.
#>  5 STL(Beer ~ season(window = Inf)) 1957 Q1   262  257.        2.14      2.55          260.
#>  6 STL(Beer ~ season(window = Inf)) 1957 Q2   228  261.      -42.6       9.47          271.
#>  7 STL(Beer ~ season(window = Inf)) 1957 Q3   236  263.      -28.5       1.80          264.
#>  8 STL(Beer ~ season(window = Inf)) 1957 Q4   320  264.       69.0     -12.7           251.
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#> # … with 208 more rows

components(dcmp) %>% autoplot()

Feature extraction and statistics

Extract features and statistics across a large collection of time series to identify unusual/extreme time series, or find clusters of similar behaviour.

aus_retail %>%
  features(Turnover, feat_stl)
#> # A tibble: 152 x 11
#>    State Industry trend_strength seasonal_streng… seasonal_peak_y… seasonal_trough… spikiness
#>    <chr> <chr>             <dbl>            <dbl>            <dbl>            <dbl>     <dbl>
#>  1 Aust… Cafes, …          0.989            0.537                0               10   6.15e-5
#>  2 Aust… Cafes, …          0.993            0.610                0               10   1.12e-4
#>  3 Aust… Clothin…          0.990            0.918                9               11   4.77e-6
#>  4 Aust… Clothin…          0.992            0.952                9               11   2.06e-5
#>  5 Aust… Departm…          0.975            0.977                9               11   2.79e-5
#>  6 Aust… Electri…          0.991            0.929                9               11   3.03e-5
#>  7 Aust… Food re…          0.999            0.882                9               11   2.74e-4
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#>  9 Aust… Furnitu…          0.980            0.669                9                1   4.66e-5
#> 10 Aust… Hardwar…          0.992            0.895                9                4   1.47e-5
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#> #   stl_e_acf10 <dbl>

This allows you to visualise the behaviour of many time series (where the plotting methods above would show too much information).

aus_retail %>%
  features(Turnover, feat_stl) %>%
  ggplot(aes(x = trend_strength, y = seasonal_strength_year)) +
  geom_point() +
  facet_wrap(vars(State))

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Most of Australian’s retail industries are highly trended and seasonal for all states.

It’s also easy to extract the most (and least) seasonal time series.

extreme_seasonalities <- aus_retail %>%
  features(Turnover, feat_stl) %>%
  filter(seasonal_strength_year %in% range(seasonal_strength_year))
aus_retail %>%
  right_join(extreme_seasonalities, by = c(现在上国外的网站加速软件, "Industry")) %>%
  ggplot(aes(x = Month, y = Turnover)) +
  geom_line() +
  facet_grid(vars(State, Industry, scales::percent(seasonal_strength_year)),
             scales = "free_y")

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