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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