Strange, I did attach. Attaching again. Maybe the file just doesn't go through?
I have:
names(OrigData):
[1] "Brand" "Month" "Value"
I read ?read.zoo
According to that index should be the column number.
I thought it should be split = 1 in my case - because I am splitting by Brand.
But neither split = 1 nor split =2 work.
And split ="Brand" does not work either. Why?
D.
On Fri, Jul 23, 2010 at 12:52 PM, David Winsemius
<dwinsem...@comcast.net> wrote:
> ?read.zoo
>
> You didn't specify the index column correctly.
> On Jul 23, 2010, at 12:36 PM, Dimitri Liakhovitski wrote:
>
>> Hello!
>>
>> I have a data set similar to the data set "monthly" in the example below:
>>
>>
>> monthly<-data.frame(month=c(20090301,20090401,20090501,20100301,20100401,20090301,20090401,20090501,20100301,20100401),monthly.value=c(100,200,300,101,201,10,20,30,11,21),market=c("Market
>> A","Market A", "Market A","Market A", "Market A","Market B", "Market
>> B","Market B","Market B", "Market B"))
>> monthly$month<-as.character(monthly$month)
>> monthly$month<-as.Date(monthly$month,"%Y%m%d")
>> (monthly)
>> str(monthly)
>>
>>
>> I am trying to use read.zoo - like in 3 lines below:
>> library(zoo)
>> z <- read.zoo(monthly, split = "market")
>> (z)
>>
>> With the artificially produced data set above, it works just fine.
>> However, with my data it gives me an error:
>>
>> OrigData<-read.csv("OrigData.csv")
>> OrigData$Month<-as.character(OrigData$Month)
>> OrigData$Month<-as.Date(OrigData$Month,"%m/%d/%y")
>> str(OrigData)
>>
>> ### The result of str(OrigData) is:
>> 'data.frame': 440 obs. of 3 variables:
>> $ Brand : Factor w/ 11 levels "aBrand","bBrand",..:
>> Month :Class 'Date' num [1:440] 13514 13545 13573 13604,...
>> Value: int NA NA NA 100 100 100 100 100 100 99
>
> ?read.zoo
>
> You didn't specify the index column correctly. In this case it needs to be =
> 2.
>
>>
>> Then I try:
>> z <- read.zoo(OrigData, split = "Brand")
>>
>> And get the error:
>> Error in read.zoo(OrigData, split = "Brand") :
>> index has 440 bad entries at data rows: 1 2 3 4 5 6 7 8 9 10 11 12 13
>>
>> But the structure of my OrigData is exactly the same as of monthly. OK
>> - OrigData always has a few NAs in "Value" coming first - but that's
>> consistent for all brands.
>> Any idea what might be wrong?
>> Thanks a lot!
>>
>> Just in case -attaching the actual file.
>>
> No. Not attached.
>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
>
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com
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