3 messages · Ethan Johnsons, Dimitris Rizopoulos, John Sorkin
How do you draw a bootstrap sample of size 9, with replacement, from the random dataset I drew? Is there a function for it in R? 9 random samples.
rnorm(9, 0, 1)
[1] 1.2071538 0.3183367 -1.4237989 -0.4050909 0.9953866 0.9588178 0.9180879 [8] -0.1509696 -1.2230688 thx ej
you need ?sample(), e.g., x <- rnorm(9) sample(x, replace = TRUE) I hope it helps. ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm Quoting Ethan Johnsons <ethan.johnsons at gmail.com>:
How do you draw a bootstrap sample of size 9, with replacement, from the random dataset I drew? Is there a function for it in R? 9 random samples.
rnorm(9, 0, 1)
[1] 1.2071538 0.3183367 -1.4237989 -0.4050909 0.9953866 0.9588178 0.9180879 [8] -0.1509696 -1.2230688 thx ej
______________________________________________ R-help at 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.
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
Ethan, It is quite easy if you use the sample function with replace=TRUE:
y<-rnorm(9,0,1) y
[1] 0.0625366 -0.1225751 0.1335859 -1.5930572 0.2493484 -0.1926270 -0.5615023 [8] 0.7537500 1.4977661
sample(y,replace=TRUE)
[1] 1.4977661 0.1335859 0.0625366 0.2493484 -0.1225751 1.4977661 0.7537500 [8] 0.2493484 0.0625366 John John Sorkin M.D., Ph.D. Chief, Biostatistics and Informatics Baltimore VA Medical Center GRECC, University of Maryland School of Medicine Claude D. Pepper OAIC, University of Maryland Clinical Nutrition Research Unit, and Baltimore VA Center Stroke of Excellence University of Maryland School of Medicine Division of Gerontology Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing) jsorkin at grecc.umaryland.edu
"Ethan Johnsons" <ethan.johnsons at gmail.com> 12/10/06 2:27 AM >>>
How do you draw a bootstrap sample of size 9, with replacement, from the random dataset I drew? Is there a function for it in R? 9 random samples.
rnorm(9, 0, 1)
[1] 1.2071538 0.3183367 -1.4237989 -0.4050909 0.9953866 0.9588178 0.9180879 [8] -0.1509696 -1.2230688 thx ej ______________________________________________ R-help at 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. Confidentiality Statement: This email message, including any attachments, is for the so...{{dropped}}