计算 stl() 的开始
我正在从 .csv 数据文件中读取每周数据。数据示例是:
Date,Demand
"Feb 08, 1991",6621
"Feb 15, 1991",6433
"Feb 22, 1991",6582
"Mar 01, 1991",7224
"Mar 08, 1991",6875
"Mar 15, 1991",6947
"Mar 22, 1991",7328
"Mar 29, 1991",6777
"Apr 05, 1991",7503
.....
我的代码是:
> temp<-read.table(file="E:\\Data\\Demand_00.csv",header=TRUE, sep=",")
> stadat<-strptime(as.character(temp[,1]),"%b %d, %Y")[1]
> statim<-as.numeric(strftime(stadat,"%Y"))+(as.numeric(strftime(stadat,"%j"))/366)
> temdat<-ts(temp[,2],start=statim,frequency=52)
> plot(temp2<- stl(log(temdat), "per"))
我的问题是:是否有更好/更干净的方法来构建 statim(上述 ts 对象中所需的启动)?请注意,这是每周数据,可能会也可能不会从一年的第一周开始。
谢谢,
账单
I'm reading weekly data from a .csv data file. A sample of the data is:
Date,Demand
"Feb 08, 1991",6621
"Feb 15, 1991",6433
"Feb 22, 1991",6582
"Mar 01, 1991",7224
"Mar 08, 1991",6875
"Mar 15, 1991",6947
"Mar 22, 1991",7328
"Mar 29, 1991",6777
"Apr 05, 1991",7503
.....
My code is:
> temp<-read.table(file="E:\\Data\\Demand_00.csv",header=TRUE, sep=",")
> stadat<-strptime(as.character(temp[,1]),"%b %d, %Y")[1]
> statim<-as.numeric(strftime(stadat,"%Y"))+(as.numeric(strftime(stadat,"%j"))/366)
> temdat<-ts(temp[,2],start=statim,frequency=52)
> plot(temp2<- stl(log(temdat), "per"))
My question is: Is there a better/cleaner way to build statim (the start required in the above ts object)? Notice that this is weekly data that may or may not start at the first week of the year.
Thanks,
Bill
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您可以使用 Zoo 软件包来简化此操作:
另一方面,您可能希望在 Epi 软件包中使用
cal.yr
,而不是将其强制为 366 天:You could use the zoo package to simplify this:
On the other hand rather than forcing it into 366 days you might want to use
cal.yr
in the Epi package: