我有大约 13 个不同站点的以下数据:
> dput(RawData[1:10,])
structure(list(Station = c(469, 469, 469, 469, 469, 469, 469,
469, 469, 469), Classification = structure(c(1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L), .Label = c(" Approved ", " Conditionally Approved ",
" Prohibited "), class = "factor"), SampleDate = structure(c(8504,
8504, 8505, 8505, 8532, 8532, 8533, 8533, 8561, 8561), class = "Date"),
Year = c(1993, 1993, 1993, 1993, 1993, 1993, 1993, 1993,
1993, 1993), SWTemp = c(10, 11, 10, 10, 14, 15, 12, 14, 15,
16), Salinity = c(26, 28, 28, 30, NA, NA, 30, 30, 28, 18),
FecalColiform = c(1.8, 2, 2, 1.8, 2, 2, 1.8, 1.8, 4.5, 2)), .Names = c("Station",
"Classification", "SampleDate", "Year", "SWTemp", "Salinity",
"FecalColiform"), row.names = c(NA, 10L), class = "data.frame")
我想分别对每个站点的粪便大肠菌群数据运行 SeasonalMannKendal。我知道它必须是一个时间序列。如何使每个站点成为它自己的时间序列,以便我可以运行这些测试?
我试图重塑数据以按样本日期列出站点结果,但这会为某些日期创建 NA,我也无法以这种方式运行测试。
我最好的方法是什么?
先感谢您!