我有一个xts对象有4个变量(2个id变量和2个度量):
> head(mi_xts)
squareId country smsIN smsOUT
2013-12-01 00:00:00 9999 39 0.4953734 0.93504713
2013-12-01 00:10:00 9999 39 0.1879042 0.50057622
2013-12-01 00:20:00 9996 39 0.5272736 0.25643745
2013-12-01 00:30:00 9996 39 0.0965593 0.25249854
2013-12-01 00:40:00 9999 39 1.2104980 0.49123277
2013-12-01 00:50:00 9999 39 0.4756599 0.09913715
我想使用一个period.apply,它每天以squareId(我不关心国家/地区)返回smsIN和smsOUT组的平均值。 我刚写了这段代码:
days <- endpoints(mi_xts, on = "days")
mi_xts.1d<- period.apply(mi_xts, INDEX = days, FUN = mean)
但显然我只获得了1行结果:
squareId country smsIN smsOUT
2013-12-01 23:50:00 9995.5 39 0.8418086 0.6644908
有什么建议吗?
答案 0 :(得分:4)
您需要split
"squareId"
,apply.daily
汇总,然后rbind
汇总一切。
s <- split(mi_xts, mi_xts$squareId)
a <- lapply(s, function(x) apply.daily(x, mean))
r <- do.call(rbind, a)