On Oct 9, 2011, at 2:24 PM, Carlos Ortega wrote:

Hello,

In R you just need to take the log of the whole whole data.frame where you
have your pci* and store in a new variable.
You do not need to use a "for" loop:

log.df <- log(your_data_frame)

Possibly with a selection for the column names in question:

log.pci.df <- log( your_data_frame[ , grep("^pci", names(your_data_frame) ) ]

You can also cbind() your identifiers and covariates columns to the result.

--
David.

Regards,
Carlos Ortega
www.qualityexcellence.es


On Sun, Oct 9, 2011 at 5:34 PM, deepankar <db...@econs.umass.edu> wrote:

Hi All,

This is surely an easy question but somehow I am not being able to get it.

I am using R 2.13.2 and have a data set where variable names like this
appear:

pci1990, pci1991, ... , pci2009.

"pci1990" has data on per capita income for 1990, "pci1991" has data on per
capita income for 1991, and so on.

I would like to create the logarithm of per capita for each of the year and
could do so in STATA with the following commands:

forvalues number = 1990/2009 {
  gen lpci`number' = log(pci`number')
}

What would be the corresponding set of commands in R?

Thanks a lot in advance.

Deepankar

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