[英]Average price of a time period in R
我開始對 R 感興趣,而且我對時間序列概念是全新的。
我有時間范圍為 200 年的面板數據,我想計算每個城市 10 年的 price_average,但我找不到一種方法將其適當地塑造成一個函數。
> all_cities
month price year town
110 10 2625 1699 Munich
111 11 2730 1699 Munich
112 12 2782 1699 Munich
113 1 34 1700 Hannover
114 1 2520 1700 Munich
115 2 34 1700 Hannover
116 2 2730 1700 Munich
117 3 33 1700 Hannover
118 3 2765 1700 Munich
119 4 36 1700 Hannover
120 4 3150 1700 Munich
我正在尋找表單的返回數據框:
> all_cities_10y
s.year e.year mean_price town
1 1690 1699 xxx Munich
2 1700 1709 xxx Munich
3 1700 1709 xxx Hannover
structure(list(month = c(1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 1, 1, 2, 2, 3, 3, 4 ), price = c(34, 2520, 34, 2730, 33, 2765, 36, 3150, 36, 3150, 36, 3097, 36, 3675, 24, 3360, 23, 2205, 20, 2152, 21, 2520, 21, 2520, 21, 2590, 21, 2567, 24, 2415, 24), year = c(1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1700, 1701, 1701, 1701, 1701, 1701, 1701, 1701), town = c("Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover", "Munich", "Hannover" )), row.names = 113:143, class = "data.frame")
這可能對你有用......我使用了你問題中的數據(見底部答案),但沒有使用提供的樣本數據,因為它只包含 1700-1709 間隔中的年份。
library( data.table )
#make it a data.table if not already
setDT( DT )
#summarise
DT[, .(mean_proce = mean(price) ),
by = .(s.year = floor(year/10)*10,
e.year = 9 + floor(year/10)*10,
town )]
# s.year e.year town mean_proce
# 1: 1690 1699 Munich 2712.333
# 2: 1700 1709 Hannover 34.250
# 3: 1700 1709 Munich 2791.250
使用的樣本數據
DT <- fread(" month price year town
10 2625 1699 Munich
11 2730 1699 Munich
12 2782 1699 Munich
1 34 1700 Hannover
1 2520 1700 Munich
2 34 1700 Hannover
2 2730 1700 Munich
3 33 1700 Hannover
3 2765 1700 Munich
4 36 1700 Hannover
4 3150 1700 Munich")
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