Displaying 3 results from an estimated 3 matches for "riskfactor".
2007 Feb 05
2
Two ways to deal with age in Cox model
...ere are two ways to
deal with age,
including age as a covariate, or to include age as part of the
follow-up time, viz,
Age as a covariate:
tetest1 <- list(time= c(4, 3,1,1,2,2,3),
status=c(1,NA,1,0,1,1,0),
age= c(0, 2,1,1,1,0,0),
riskfactor= c(0, 0,0,0,1,1,1))
fitagecovariate<-coxph( Surv(time, status) ~ age +riskfactor, test1)
fitagecovariate
Age included as part of follow-up time:
test2<-test1
test2$timeplusage<-test2$time+test2$age
fitagefollowup<-coxph( Surv(timeplusage, status) ~ riskfactor, test2)
fitagefo...
2006 Dec 05
4
has_many with :uniq not working for me
Hi all,
I have a relationship (no really!)
class RiskMatrix < ActiveRecord::Base
has_many :severities, :order => :position, :uniq => true
end
class RiskFactor < ActiveRecord::Base
belongs_to :risk_matrix
validates_presence_of :descriptor, :example
validates_uniqueness_of :descriptor, :example, :scope=> :risk_matrix_id
end
class Severity < RiskFactor
acts_as_list :scope => :risk_matrix
end
I don''t want any duplicates...
2008 Jun 09
2
Probs with paste
Hello all,
After some months doing ok with R, I am embarrassed that I have to make
this my first posting to the help list. I am trying to run the
following (actually in a loop but shortened for the post):
risk.factors <- c("file$A", "file$B", "file$C", "file$D", "file$E")
table(paste(risk.factors[1]))
but run into problems