http://finzi.psych.upenn.edu/R/Rhelp02a/archive/98227.html
Your Rprofile has the setting
options(stringsAsFactors = TRUE)
If you override it globally by using
options(stringsAsFactors = FALSE)
it will give you what you want but observe Gabor's
caveat. I don't know of the other solution re settings
stringsAsFactors in the data.frame will work but it
looks like it should
--- "Li, Yan (IED)" <[EMAIL PROTECTED]>
wrote:
> Hi all,
>
> I was trying to convert a data frame to a zoo object
> so I can use some
> time series functions like lag(). But it seems then
> everything became a
> factor, so I have to convert it back to numeric to
> run the correct
> regressions. Is there a way to avoid it? Here is an
> example:
>
> #############################
> a <- data.frame(nn =as.character(c("a", "b", "c",
> "d")), dd =
> as.Date("2007-08-01")+ c(1,2,3,4), x = rnorm(4), y =
> rnorm(4))
> a
> str(a)
>
>
> b <- zoo(a, order.by = a$dd)
> b
> str(b)
>
> c <- data.frame(b)
> str(c)
>
> #############################################333
> Results of this example:
> > a
> nn dd x y
> 1 a 2007-08-02 0.388 -0.394
> 2 b 2007-08-03 -0.054 -0.059
> 3 c 2007-08-04 -1.377 1.100
> 4 d 2007-08-05 -0.415 0.763
> > str(a)
> 'data.frame': 4 obs. of 4 variables:
> $ nn: Factor w/ 4 levels "a","b","c","d": 1 2 3 4
> $ dd:Class 'Date' num [1:4] 13727 13728 13729
> 13730
> $ x : num 0.3877 -0.0538 -1.3771 -0.4150
> $ y : num -0.3943 -0.0593 1.1000 0.7632
> > b <- zoo(a, order.by = a$dd)
> > b
> nn dd x y
> 2007-08-02 a 2007-08-02 0.388 -0.394
> 2007-08-03 b 2007-08-03 -0.054 -0.059
> 2007-08-04 c 2007-08-04 -1.377 1.100
> 2007-08-05 d 2007-08-05 -0.415 0.763
> > str(b)
> chr [1:4, 1:4] "a" "b" "c" "d" "2007-08-02"
> "2007-08-03" ...
> - attr(*, "dimnames")=List of 2
> ..$ : chr [1:4] "1" "2" "3" "4"
> ..$ : chr [1:4] "nn" "dd" "x" "y"
> - attr(*, "index")=Class 'Date' num [1:4] 13727
> 13728 13729 13730
> >
> > c <- data.frame(b)
> > str(c)
> 'data.frame': 4 obs. of 4 variables:
> $ nn: Factor w/ 4 levels "a","b","c","d": 1 2 3 4
> ..- attr(*, "names")= chr "1" "2" "3" "4"
> $ dd: Factor w/ 4 levels
> "2007-08-02","2007-08-03",..: 1 2 3 4
> ..- attr(*, "names")= chr "1" "2" "3" "4"
> $ x : Factor w/ 4 levels " 0.388","-0.054",..: 1 2
> 4 3
> ..- attr(*, "names")= chr "1" "2" "3" "4"
> $ y : Factor w/ 4 levels " 0.763"," 1.100",..: 4 3
> 2 1
> ..- attr(*, "names")= chr "1" "2" "3" "4"
> ##################################3
> So after converting to zoo, all the variables became
> factors. How can I
> keep this from happening? Thank you very much for
> any advice.
>
> Yan
>
--------------------------------------------------------
>
> This is not an offer (or solicitation of an offer)
> to bu...{{dropped:22}}
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
>
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