A follow-up on the data/variable issue I posted earlier:

Here was what I did, which might was obviously causing the problem:

I inserted the following line in my file "Rprofile.site":
   setwd("z:/R")

Then, as soon as I run R (before I read any data) I issue

summary(mydata)

I get summary statistics for a dozen variables from a file that 
appeared to reside in z:/R.

Am I not supposed to set the working directory by the line above 
(which brings me to my preferred working directory each time I run R)?

At 06:05 PM 11/15/2011, Steven Yen wrote:
>Can someone help me with this variable/data reading issue?
>I read a csv file and transform/create an additional variable (called y).
>
>The first set of commands below produced different sample statistics 
>for hw11$y and y
>
>In the second set of command I renameuse the variable name yy, and 
>sample statistics for $hw11$yy and yy are identical.
>
>Using y <- yy fixed it, but I am not sure why I would need to do that.
>
>That "y" appeared to have come from a variable called "y" from 
>another data frame (unrelated to the current run).
>
>Help!
>
> > setwd("z:/homework")
> > sink ("z:/homework/hw11.our", append=T, split=T)
> > hw11 <- read.csv("ij10b.csv",header=T)
> > hw11$y <- hw11$e3
> > attach(hw11)
>The following object(s) are masked _by_ '.GlobalEnv':
>     y
> > (n <- dim(hw11)[1])
>[1] 13765
> > summary(hw11$y)
>     Min.  1st Qu.   Median     Mean  3rd Qu.     Max.
>   0.0000   0.4500   1.0000   1.6726   2.0000 140.0000
> > length(hw11$y)
>[1] 13765
> > summary(y)
>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
>0.00000 0.00000 0.00000 0.24958 0.00000 1.00000
> > length(y)
>[1] 601
> >
>
> > setwd("z:/homework")
> > sink ("z:/homework/hw11.our", append=T, split=T)
> > hw11 <- read.csv("ij10b.csv",header=T)
> > hw11$yy <- hw11$e3
> > attach(hw11)
> > hw11$yy <- hw11$e3
> > summary(hw11$yy)
>     Min.  1st Qu.   Median     Mean  3rd Qu.     Max.
>   0.0000   0.4500   1.0000   1.6726   2.0000 140.0000
> > length(hw11$yy)
>[1] 13765
> > summary(yy)
>     Min.  1st Qu.   Median     Mean  3rd Qu.     Max.
>   0.0000   0.4500   1.0000   1.6726   2.0000 140.0000
> > length(yy)
>[1] 13765
> >
>
>--
>Steven T. Yen, Professor of Agricultural Economics
>The University of Tennessee
>http://web.utk.edu/~syen/

--
Steven T. Yen, Professor of Agricultural Economics
The University of Tennessee
http://web.utk.edu/~syen/  
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