我正在尝试生成一个分组表，类似于this。如果我的组是由天气变量组成的月份，而行是年份，则无法弄清楚它是如何工作的。
这是数据的样子：
year_var month temp rain rhum
<dbl> <dbl> <dbl> <dbl> <dbl>
1 2007 4 11 16.4 73.5
2 2007 5 11.6 38.3 74.3
3 2007 6 14 108. 83.9
4 2007 7 14.4 129. 83.6
5 2007 8 14.9 104. 83.2
6 2007 9 13.5 36.8 82.7
7 2008 4 7.8 31.8 76.4
8 2008 5 12.7 37.1 76.6
9 2008 6 13.3 86.8 77.7
10 2008 7 15.2 137. 80.4
11 2008 8 15.3 142. 83.1
12 2008 9 12.4 81.2 84.9
是否可以将month列转换为分组变量？
我的数据示例：
structure(list(year_var = c(2007, 2007, 2007, 2007, 2007, 2007,
2008, 2008, 2008, 2008, 2008, 2008), month = c(4, 5, 6, 7, 8,
9, 4, 5, 6, 7, 8, 9), temp = c(11, 11.6, 14, 14.4, 14.9, 13.5,
7.8, 12.7, 13.3, 15.2, 15.3, 12.4), rain = c(16.4, 38.3, 107.7,
129.3, 103.8, 36.8, 31.8, 37.1, 86.8, 136.7, 142.4, 81.2), rhum = c(73.5,
74.3, 83.9, 83.6, 83.2, 82.7, 76.4, 76.6, 77.7, 80.4, 83.1, 84.9
)), row.names = c(NA, -12L), class = c("grouped_df", "tbl_df",
"tbl", "data.frame"), vars = "year_var", drop = TRUE, indices = list(
0:5, 6:11), group_sizes = c(6L, 6L), biggest_group_size = 6L, labels = structure(list(
year_var = c(2007, 2008)), row.names = c(NA, -2L), class = "data.frame", vars = "year_var", drop = TRUE))