有缺失值时使用 rollmean (NA) [英] Using rollmean when there are missing values (NA)
本文介绍了有缺失值时使用 rollmean (NA)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个数据集,里面有几个 NA
.我采用滚动平均值并期望当窗口中没有 NA
时,滚动平均值应该产生一个数字而不是 NA
,但是,rollmeanr<
zoo
中的/code> 似乎没有这样做.示例:
I have a data set which has a couple of NA
in it. I take a rolling mean and expect that when there is no NA
in the window, the rolling mean should produce a number as opposed to NA
, however, rollmeanr
in zoo
does not seem to do this. Example:
require(zoo)
z = zoo(cbind(a=0:10, b=c(NA,10:1), c=sample(1:11,11)), 1:11)
rollmeanr(z, k=3, fill=NA)
a b c
1 NA NA NA
2 NA NA NA
3 1 NA 3.333333
4 2 NA 4.666667
5 3 NA 4.000000
6 4 NA 6.333333
7 5 NA 7.000000
8 6 NA 9.333333
9 7 NA 8.333333
10 8 NA 8.666667
11 9 NA 5.666667
rollapply(z, width=3, FUN=mean, by=1, by.column=TRUE, fill=NA, align="right")
a b c
1 NA NA NA
2 NA NA NA
3 1 NA 3.333333
4 2 9 4.666667
5 3 8 4.000000
6 4 7 6.333333
7 5 6 7.000000
8 6 5 9.333333
9 7 4 8.333333
10 8 3 8.666667
11 9 2 5.666667
我希望这两个调用产生相同的结果.请给出意见.一些会话信息:
I would expect these two calls to generate the same result. Please comment. Some session info:
sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] zoo_1.7-10
loaded via a namespace (and not attached):
[1] grid_3.0.1 lattice_0.20-15
推荐答案
来自 ?rollmean
'rollmean' 的默认方法没有处理包含NA"的输入.在这种情况下,请使用rollapply"相反.
The default method of ‘rollmean’ does not handle inputs that contain ‘NA’s. In such cases, use ‘rollapply’ instead.
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