预测分层时间序列

Question

我试图对三个发电厂的生产数据进行6个月的预测，我将数据构建为具有3个级别的hts对象。但是，当我执行预测功能，然后尝试使用测试数据查看准确性时，出现以下错误：“ x-fcasts中的错误：不一致的数组”

此外，当我尝试对hts对象应用“ arima”作为预测方法时，我得到以下信息（警告消息重复了9次，因为hts对象中有9个时间序列）：

  

预测<-Forecast（data，h = 6，method =“ bu”，fmethod =“ arima”）   

我使用以下说明来获取hts对象：

，数据具有以下结构： 我不确定我要去哪里错。任何人都可以提供一些想法吗？

谢谢！

数据：

structure(list(LarGroup1 = c(188.3, 187.2, 94.7, 109.2, 202.7, 
146.6, 121.9, 151.3, 111.1, 103.4, 188.1, 168.1, 233.9, 230.7, 
187.1, 0, 98.9, 173.5, 149.4, 168.6, 4.7, 14.8, 91.8, 166.5, 
170.5, 123.6, 85.2, 64.4), LarGroup2 = c(159.1, 127.7, 210.3, 
199.8, 113, 143.4, 144.5, 83.8, 41.6, 35.1, 95.2, 178.2, 241.1, 
236.4, 181.9, 194.3, 196.1, 92.4, 154.6, 78.9, 35.7, 0, 74.5, 
75.1, 140, 142.5, 3.8, 17.5), RibGroup1 = c(49.4, 102.4, 50.8, 
118.8, 108.4, 139.5, 121.7, 69.6, 53.4, 28, 113.3, 96.3, 70.8, 
124.4, 54.4, 128.7, 63.3, 2.1, 41.3, 0.4, 0.6, 0, 5.4, 57.9, 
9.9, 30, 221, 167.2), RibGroup2 = c(32.7, 32, 98.1, 6.3, 85.5, 
96.6, 41.1, 44.9, 50.4, 27.3, 0, 45.4, 199.1, 179.2, 86.1, 0, 
58.4, 43.3, 41.8, 42.1, 22.1, 11.8, 71.8, 112, 204.1, 40.9, 24.5, 
210.9), RibGroup3 = c(90.8, 15.4, 10.5, 124.4, 33.9, 8.4, 38.3, 
56.9, 13.5, 0, 32.6, 132.8, 160.7, 168.7, 60.7, 131.9, 110.8, 
29.2, 131.3, 62.1, 6.1, 0, 0, 3.4, 23.9, 192.7, 165.5, 0), SinGroup1 = c(235.2, 
225.4, 226.1, 234.4, 222.1, 232.3, 233.4, 201.9, 195.3, 209.4, 
233.6, 223.6, 222.2, 232, 224, 149.8, 201.6, 220.2, 203.1, 212.1, 
71.9, 82.3, 183.2, 210.6, 198.6, 230.8, 218, 163.2), SinGroup2 = c(233.4, 
225.6, 227, 51.6, 76, 230.7, 233.1, 202.7, 200.2, 207.2, 228.4, 
226.2, 183.9, 230.4, 222.3, 227.7, 177.9, 152, 218.6, 210.6, 
80.9, 63.2, 188.1, 209.5, 233.2, 210.1, 226.5, 200.5), SinGroup3 = c(233.2, 
188.5, 226.9, 234.7, 222.8, 234.6, 220.6, 156.4, 209.2, 218.7, 
232.9, 226.1, 215.4, 231, 222.7, 222.7, 183.7, 203.8, 216.8, 
112, 0, 39.6, 180.8, 203.6, 221.1, 228.9, 202.8, 186.7), SinGroup4 = c(218, 
215.5, 226.8, 235.6, 223.6, 234.8, 234.9, 69.3, 192, 207.8, 235.2, 
217.2, 235.1, 231.8, 223.5, 230.5, 225.6, 220.1, 220, 211.9, 
114.8, 44.5, 158.5, 206.3, 231.8, 179, 225.3, 198.6)), class = "data.frame", row.names = c(NA, 
-28L))

Answer 1

1. 在准确性功能中，您需要包括测试数据，而不是训练数据。您要求提前6个步骤，但测试数据仅包含4个时间段。

2. 季节性差异错误表明您使用的是预报包的旧版本。请更新您的软件包。

以下代码使用当前的CRAN软件包（预测v8.4，hts v

library(hts)
Production_data <- data.frame(
  LarGroup1 = c(
    188.3, 187.2, 94.7, 109.2, 202.7,
    146.6, 121.9, 151.3, 111.1, 103.4, 188.1, 168.1, 233.9, 230.7,
    187.1, 0, 98.9, 173.5, 149.4, 168.6, 4.7, 14.8, 91.8, 166.5,
    170.5, 123.6, 85.2, 64.4
  ), LarGroup2 = c(
    159.1, 127.7, 210.3,
    199.8, 113, 143.4, 144.5, 83.8, 41.6, 35.1, 95.2, 178.2, 241.1,
    236.4, 181.9, 194.3, 196.1, 92.4, 154.6, 78.9, 35.7, 0, 74.5,
    75.1, 140, 142.5, 3.8, 17.5
  ), RibGroup1 = c(
    49.4, 102.4, 50.8,
    118.8, 108.4, 139.5, 121.7, 69.6, 53.4, 28, 113.3, 96.3, 70.8,
    124.4, 54.4, 128.7, 63.3, 2.1, 41.3, 0.4, 0.6, 0, 5.4, 57.9,
    9.9, 30, 221, 167.2
  ), RibGroup2 = c(
    32.7, 32, 98.1, 6.3, 85.5,
    96.6, 41.1, 44.9, 50.4, 27.3, 0, 45.4, 199.1, 179.2, 86.1, 0,
    58.4, 43.3, 41.8, 42.1, 22.1, 11.8, 71.8, 112, 204.1, 40.9, 24.5,
    210.9
  ), RibGroup3 = c(
    90.8, 15.4, 10.5, 124.4, 33.9, 8.4, 38.3,
    56.9, 13.5, 0, 32.6, 132.8, 160.7, 168.7, 60.7, 131.9, 110.8,
    29.2, 131.3, 62.1, 6.1, 0, 0, 3.4, 23.9, 192.7, 165.5, 0
  ), SinGroup1 = c(
    235.2,
    225.4, 226.1, 234.4, 222.1, 232.3, 233.4, 201.9, 195.3, 209.4,
    233.6, 223.6, 222.2, 232, 224, 149.8, 201.6, 220.2, 203.1, 212.1,
    71.9, 82.3, 183.2, 210.6, 198.6, 230.8, 218, 163.2
  ), SinGroup2 = c(
    233.4,
    225.6, 227, 51.6, 76, 230.7, 233.1, 202.7, 200.2, 207.2, 228.4,
    226.2, 183.9, 230.4, 222.3, 227.7, 177.9, 152, 218.6, 210.6,
    80.9, 63.2, 188.1, 209.5, 233.2, 210.1, 226.5, 200.5
  ), SinGroup3 = c(
    233.2,
    188.5, 226.9, 234.7, 222.8, 234.6, 220.6, 156.4, 209.2, 218.7,
    232.9, 226.1, 215.4, 231, 222.7, 222.7, 183.7, 203.8, 216.8,
    112, 0, 39.6, 180.8, 203.6, 221.1, 228.9, 202.8, 186.7
  ), SinGroup4 = c(
    218,
    215.5, 226.8, 235.6, 223.6, 234.8, 234.9, 69.3, 192, 207.8, 235.2,
    217.2, 235.1, 231.8, 223.5, 230.5, 225.6, 220.1, 220, 211.9,
    114.8, 44.5, 158.5, 206.3, 231.8, 179, 225.3, 198.6
  )
)
Production_data_ts <- ts(Production_data, frequency = 12, start = c(2016, 7))
Production_data_hts <- hts(Production_data_ts, characters = c(3, 6))
data <- window(Production_data_hts, start = c(2016, 7), end = c(2018, 6))
test <- window(Production_data_hts, start = c(2018, 7), end = c(2018, 10))
forecasts <- forecast(data, h = 4, method = "bu")
accuracy(forecasts, test)