[R] interpolation to montly data

[stef salvez]

I would like to clarify that since each observation is obtained every
28 days, each such observation is a 4-week average

thanks

On 6/16/12, stef salvez <loggyedy at googlemail.com> wrote:
> I have a panel data set (in MS excel)  like the one below
>
>
>  1         "23/11/08"            2
> 1   "28/12/08"                   3
> 1    "25/01/09"                   4
> 1   "22/02/09"                   5
> 1    "29/03/09"                  6
> 1  "26/04/09"                   32
> 1  "24/05/09"                   23
> 1  "28/06/09"                   32
> 2   "26/10/08"                45
> 2  "23/11/08"                 46
> 2  "21/12/08"               90
> 2  "18/01/09"                54
> 2  "15/02/09"                 65
> 2   "16/03/09"               77
> 2  "12/04/09"                    7
> 2   "10/05/09"                   6
>
>
>
>
> the start and end date of the time series for countries 1 and 2 are
> different. For example, for country 1 the time series begins on
> "23/11/08" while for country 2 the time series begins on "26-10-2008”.
>
> My data on prices are available every 28 days (or equivalently every 4
> weeks). But in some cases I have jumps (35 days or 29 days instead of
> 28 days). For example from the above table we have such jumps: from
> "28/12/08" to "28/12/08" , from 22/02/09" to "29/03/09", etc
>
> My goal is to have a unified sequence of dates across countries. So,
> to achieve this I want to apply the following solutions
>
> I want  to take what I have and calculate monthly average prices and also
> report how many prices those averages are based on. I suppose that I
> will still have gaps and may well need to interpolate.
>
> Please, I would be grateful to you if you could provide the exact code
> for doing this
>
>
> thanks a lot
>