search for: pietrobon

...he mean and median costs for the costs happening from 6 to 12 months after the index encounter, and so on. Notice that the first ID has two encounters during the index date, making it more difficult to define a single row with the index encounter. Any help would be appreciated, Ricardo Ricardo Pietrobon, MD Assistant Professor of Surgery Duke University Medical Center Durham, NC 27710 US

...0.971 pfq_rsocial_event 0.930 pfq_sleisure_home 0.811 This is just one example -- all other comparisons with a different number of factors, with and without rotation, generated different numbers. Any thoughts from the list members on the reasons for the discrepancy? thanks, Ricardo Pietrobon, MD, PhD Duke University Health System [[alternative HTML version deleted]]

https://gist.github.com/rpietro/6430771 stemDocument function doesn't seem to be working. Tried to look up and a few people have reported the problem, but no solution that I could find. would appreciate any help

...:45:51 GMT Password last set: Tue, 24 Oct 2006 14:09:22 GMT Password can change: 0 Password must change: Sun, 22 Apr 2007 14:09:22 GMT Last bad password : 0 Bad password count : 0 Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF LDIF: dn: uid=administrator,ou=Users,dc=studiopietrobon,dc=it objectClass: inetOrgPerson objectClass: sambaSamAccount objectClass: posixAccount objectClass: shadowAccount gidNumber: 0 uidNumber: 0 homeDirectory: /dev/null sambaLogonTime: 0 sambaLogoffTime: 2147483647 sambaKickoffTime: 2147483647 sambaPwdCanChange: 0 sambaHomeDrive: H: sambaPrimaryGroupS...

rrdf is incredibly helpful, but I've notice that the rrdf package for mac hasn't been working for some time: http://goo.gl/5Ukpn . wondering if there is still a plan to maintain that in the long run, or if there is some other alternative to read RDF files. [[alternative HTML version deleted]]

...tion on how to handle survey data. In other words, is there a specific package to handle a combination of weigths, clusters and strata. I am also struggling to handle such a large data set. Any suggestions and/or references regarding these two issues would be greatly appreciated. Rick Ricardo Pietrobon, MD Assistant Professor of Surgery Duke University Medical Center -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in...

Yesterday I just noticed the new document on R and regulatory aspects for biomedical research posted at http://www.r-project.org/doc/R-FDA.pdf Coming from an institution that performs a large number of clinical trials for FDA and being an advocate of R myself, I have found that the following issues usually come up when discussing the use of R for FDA trials: 1. Most FDA submissions come down to

I currently have a data set describing human subjects enrolled into an international clinical trial, the name of the hospital enrolling this human subject, the date when the subject was enrolled, and a vector with variables representing characteristics of the site (e.g., number of beds in a hospital). my data sets looks like this: subject hospital date_enrollment hospital_beds 1 hospitalA

Hi all, I will be teaching a graduate-level course on R at CU Boulder next semester. I have a teaching idea that might also help improve the R wiki page... I wanted to know what you all thought of it and wanted to solicit some advice about doing it. During the latter part of the course, students will choose a topic of interest (e.g., hierarchical linear modeling), and show how to achieve it in

our group at Duke is currently attempting to connect two data sets fed through a web-based system, one containing research questions (i.e., variables positioned with certain roles) and a database of statistical methods. this connection is done informally in a number of R packages and related software such as Rcmdr, R4calc, and Rkward where a variable of a certain type is matched to a certain