[R] converting to time series object : ts - package:stats

[Gabor Grothendieck]

We don't have data.csv so its still not ***reproducible*** by anyone
else.  To be reproducible it means that anyone can copy the code
in your post, paste it into R and get the same answer.

Suggest you post the output of
   dput(df)

and then post
dput <- ...the output you got from dput(df)...

Now its reproducible.

On 6/26/06, Sachin J <sachinj.2006 at yahoo.com> wrote:
> Hi Achim,
>
>  I did the following:
>
>  >df <- read.csv("C:/data.csv", header=TRUE,sep=",",na.strings="NA", dec=",",  strip.white=TRUE)
>
>  Note: data.csv has 10 (V1...V10) columns.
>
> >df[1]
>              V1
>  1        11.08
> 2         7.08
> 3         7.08
> 4         6.08
> 5         6.08
> 6         6.08
> 7        23.08
> 8        32.08
> 9         8.08
> 10       11.08
> 11        6.08
> 12       13.08
> 13       13.83
> 14       16.83
> 15       19.83
> 16        8.83
> 17       20.83
> 18       17.83
> 19        9.83
> 20       20.83
> 21       10.83
> 22       12.83
> 23       15.83
> 24       11.83
>
>  >tsdata <-  ts((df[1]),frequency = 12, start = c(2005, 1))
>
>  The resulting time series is different from the df. I don't know why? I think I am doing something silly.
>
>  TIA
>
>  Sachin
>
>
> Achim Zeileis <Achim.Zeileis at wu-wien.ac.at> wrote:
>  On Mon, 26 Jun 2006, Sachin J wrote:
>
> > Hi,
> >
> > I am trying to convert a dataset (dataframe) into time series object
> > using ts function in stats package. My dataset is as follows:
> >
> > >df
> > [1] 11.08 7.08 7.08 6.08 6.08 6.08 23.08 32.08 8.08 11.08 6.08 13.08 13.83 16.83 19.83 8.83 20.83 17.83
> > [19] 9.83 20.83 10.83 12.83 15.83 11.83
>
> Please provide a reproducible example. You just showed us the print output
> for an object, claiming that it is an object of class "data.frame" which
> is rather unlikely given the print output.
>
> > I converted this into time series object as follows
> >
> > >tsdata <- ts((df),frequency = 12, start = c(1999, 1))
>
> which produces the right result for me if `df' is a vector or a
> data.frame:
>
> df <- c(11.08, 7.08, 7.08, 6.08, 6.08, 6.08, 23.08, 32.08, 8.08, 11.08,
> 6.08, 13.08, 13.83, 16.83, 19.83, 8.83, 20.83, 17.83, 9.83, 20.83,
> 10.83, 12.83, 15.83, 11.83)
> ts(df, frequency = 12, start = c(1999, 1))
> ts(as.data.frame(df), frequency = 12, start = c(1999, 1))
>
> > The resulting time series is as follows:
> >
> > Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
> > 1999 2 15 15 14 14 14 12 13 16 2 14 5
> > 2000 6 8 10 17 11 9 18 11 1 4 7 3
> >
> > I am unable to understand why the values of df and tsdata does not match.
>
> So are we because you didn't really tell us enough about df...
>
> Best,
> Z
>
> > I looked at ts function and I couldn't find any data transformation. Am
> > I missing something here? Any pointers would be of great help.
> >
> > Thanks in advance.
> >
> > Sachin
> >
> >
> > ---------------------------------
> >
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> >
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