Displaying 4 results from an estimated 4 matches for "statististics".
2004 Jan 01
1
Barplot errors in MASS script
Reading "Modern Applied Statististics with S" and trying the corresponding
examples both in the book and in ../lib/R/library/MASS/script, I'm now trying
chapter 4 plotting bars with the following code on a linux box with R 1.8.1:
----------------------
library(MASS)
library(lattice)
options(echo=T, width=65, digits=5)
lung.dea...
2007 Oct 25
0
S-Plus or R programmer for Pharmaceutical Company
We currently have an opening for a S-Plus/R programmer at a large
pharmaceutical company.
Job Description:
S-Plus/ R Programmer -BS/MS in statistics - Solid S-Plus (or R) and SAS
programming skills required, minimum 1 year work experience writing
functions in S-Plus or R. SAS experience should include writing SAS macros
and creating and manipulating ODS datasets. Strong interpersonal and
2006 Apr 11
2
variable selection when categorical variables are available
Dear All,
Probably it is not highly relevant question: Why do stepwise regression
functions in R (step() or stepAIC()) add/delete categorical variables as a
set? For example, I have a four-level factor variable d, so dummies are
d1,d2,d3, as stepwise regression operates d, adding or removing, d1,d2,d3
are simultaneously added/removed. What's the concern here if operating
dummies individually?
2003 Dec 01
2
wilcoxon-pratt signed rank test in R - drug-effiacy
Hi.
I'm going to introduce the R-package for a group of medical doctors later
this week and is a little confused about there use of a test named
"willcoxon-pratt" for testing if the clinical and biochemical markers has
decreased significantly after the use of some drugs for a group of patients.
Looking into the R-functions I would in R recommand using a matched-pairs
Wilcoxon