[R] Converting Variable Name into String

[Bert Gunter]

1. This won't work. The lagged variables have length one less than the
originals.

2. How about:

lagged_Q <- data.frame( lapply( QuarterlyData,diff))

You can then change the names in lagged_Q to something like
lagged_originalName via paste() if you like.

3. I strongly suspect that none of this is necessary or wise: R  has
numerous time series modeling and graphical capabilities that handle
this automatically. I suggest you first  check the time series Task
View on CRAN to see if something there already does what you want.

-- Bert

On Thu, May 19, 2011 at 8:05 AM, Paolo Rossi
<statmailinglists at googlemail.com> wrote:
> Hello,
>
> I would like to create lagged and delta variables from a set of variables
> and then add them to a dataframe
>
> Suppose that GDPPcSa is a variable. I would like to be able to do this
>
> QuarterlyData$D1GdpPcSa = diff(GDPPcSa , 1)
>
> in an automated fashion so that I loop over Quartely data to compute the
> first difference  of its variables and add them to the dataframe.
>
> .It would be great to get a way to create the string "D1GdpPcSa" knowing
> that the name of the var is GdpPcSa. Then I can add the varibale  D1GdpPcSa
> to the dataframe and work on its names attribute.
>
> Thanks
>
> Paolo
>
>        [[alternative HTML version deleted]]
>
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-- 
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Bert Gunter
Genentech Nonclinical Biostatistics