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

[Achim Zeileis]

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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