From: Wensui Liu <liuwensui_at_gmail.com>

Date: Sun 13 Aug 2006 - 15:31:21 EST

data<-data.frame(X);

summary(data);

Date: Sun 13 Aug 2006 - 15:31:21 EST

zubin,

for your second question:

supposed you have x1 and x2 and want to combine them in a matrix X in a data frame called data, try the following code:

X<-matrix(1:10, ncol = 2, dimnames = list(NULL, c("x1", "x2")));

class(X) class(X)<-"AsIs"; class(X)

data<-data.frame(X);

summary(data);

On 8/12/06, zubin <binabina@bellsouth.net> wrote:

> Hello! i know these are basic but i cannot seem to find the answer thru

*> my searches..
**>
**> 1) Can someone recommend an equivalent to SAS PROC Standardize in R? I
**> am in need to frequently standardize a data frame, with z-scores, or
**> squash to 0-1 scale - is there a slick function or package someone can
**> recommend?
**>
**> 2) Also, have data sets with a lot of predictor variables. in the
**> diabetes data frame i see that fields have been grouped to X and Y
**> variables, making it very easy to identify X and Y in the regression
**> techniques. How is this done, how do you group lets say a group of
**> columns into 1 matrix, within a data frame. example: the AsIs group is
**> a matrix of X variables:
**>
**> > str(diabetes)
**> `data.frame': 442 obs. of 3 variables:
**> $ x : AsIs [1:442, 1:10] 0.038075.... -0.00188.... 0.085298....
**> -0.08906.... 0.005383.... ...
**> ..- attr(*, "dimnames")=List of 2
**> .. ..$ : NULL
**> .. ..$ : chr "age" "sex" "bmi" "map" ...
**> ..- attr(*, "class")= chr "AsIs"
**> $ y : num 151 75 141 206 135 97 138 63 110 310 ...
**> $ x2: AsIs [1:442, 1:64] 0.038075.... -0.00188.... 0.085298....
**> -0.08906.... 0.005383.... ...
**> ..- attr(*, ".Names")= chr "age" "age" "age" "age" ...
**> ..- attr(*, "dimnames")=List of 2
**> .. ..$ : chr "1" "2" "3" "4" ...
**> .. ..$ : chr "age" "sex" "bmi" "map" ...
**> ..- attr(*, "class")= chr "AsIs"
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch 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.
**>
*

-- WenSui Liu (http://spaces.msn.com/statcompute/blog) Senior Decision Support Analyst Health Policy and Clinical Effectiveness Cincinnati Children Hospital Medical Center ______________________________________________ R-help@stat.math.ethz.ch 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.Received on Sun Aug 13 15:46:22 2006

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