Displaying 9 results from an estimated 9 matches for "byar".
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2009 May 04
1
Nelson-Aalen estimator of cumulative hazard
...hey should be identical. However, they are not. Their difference is a monotonically increasing with time. This difference is probably not large to make any impact in the application, but is annoyingly non-trivial for me to just ignore it.
This is a competing risks problem, with the Green & Byar (1980) data set (the STATA data set is attached).
Can anyone explain to me the reason for the discrepancy?
require(foreign)
gb <- read.dta("GB.dta") # Green & Byar data; N = 483
# Method 1
fit1 <- coxph( Surv(time, status=="Cancer" | status=="CVD" | st...
2002 May 21
2
weird winbind scenario
Hi, I have a box running Mandrake 8.2 and samba 2.2.4 on an NT
domain. smbpasswd -j says it joins the domain ok, I use the included
sys-auth-windbind file for pam, and the winbind entries are in
nsswitch.conf. Everything appears to be running, but when I try wbinfo -u
I get "Error looking up domain users". getent passwd only return the linux
accounts. Yet wbinfo -t returns
2004 Feb 05
2
Incomplete Factorial design
...+
-
Treatment A
+
a
b
-
c
-------
I am looking for functions in R to estimate the sample size and/or to conduct the
analysis. I have just found an article from Byar in Statistics in Medicine for a 2^3
incomplete factorial design, but I would like not to discover again the wheel..
TIA
dr. Giovanni Parrinello
Section of Medical Statistics
Department of Biosciences
University of Brescia
25127 Viale Europa, 11
Brescia Italy
Tel: +390303717528
Fax: +390303701157...
2005 Feb 14
3
Help, problems with permissions
Hi
I am replacing my current mail system, using Exim/Postgres/WU-IMAP to
another host using Dovecot.
Everything has gone well, until I have tried to access some test mails
via POP.
The error message I am getting is
Feb 14 03:03:57 wpc1273 pop3(simonw at orion-w-t.co.uk): lstat
(/home/dovecot/users/orion-w-t.co.uk/simonw/cur) failed: Permission
denied
Feb 14 03:03:57 wpc1273 pop3(simonw at
2009 Jan 15
1
Confidence Intervals for Poisson
Hi folks!
I run the following code to get a CI for a Poisson with lambda=12.73
library(MASS)
set.seed(125)
x <- rpois(100,12.73)
lambda_hat<-fitdistr(x, dpois, list(lambda=12))$estimate
#Confidence Intervals - Normal Approx.
alpha<-c(.05,.025,.01)
for(n in 1:length(alpha)) {
LowerCI<-mean(x)-(qnorm(1-alpha[n]/2, mean = 0, sd =
1)*sqrt(var(x)/length(x)))
2002 May 23
1
Regenerate MACHINE.SID
I goofed adding some machines to my domain so now I have to do it all over.
I removed the secrets.tdb and MACHINE.SID files, but when I join the domain
again, the MACHINE.SID is not regenerated. How do I force them to be
correctly regenerated on 2.2.4? Here's what I'm doing:
1. kill smb and winbind
2. delete secrets.tdb and MACHINE.SID
3. remove from NT4 PDC
4. add machine to NT4 PDC
5.
2003 Apr 03
1
samba 3 as a pretend DC?
Hi, I'm stuck in a network enviroment where ADS has taken over and by the end of the year the main DC's will only allow kerberos authentication. The problem is I have several legacy systems that are equipment controllers that can't be upgraded. They are running everything from OS/2 to NT4. So I need something for them to authenticate against using Lanman/NTLM/etc.
Would it be
2003 Dec 03
1
net rpc vampire is sucking my brain!
Trying to migrate NT4 to samba 3.0.0 or 3.0.1pre3 with an ldap backend.
I add a backup server account to the domain and joined. Getting the SID
and the ldap init seem to work, and I start windbind. When I run net rpc
vampire all I get is a ton of "Could not create posix account info for "
errors. Then ofcourse pdbedit -L returns smbldap_search_suffix: Problem
during the LDAP search:
2009 May 05
1
self organizing map advice for categorical data
...atters which method is used to handle
ties in "coxph". The default is "efron". If I use method="breslow", there
is no difference between the 2 different ways of computing the Nelson-Aalen
estimte.
require(foreign)
gb <- read.dta("GB.dta") # Green & Byar data; N = 483
# Method 1 (note the use of Breslow estimator)
fit1 <- coxph( Surv(time, status=="Cancer" | status=="CVD" |
status=="Other") ~ 1, method="breslow", data=gb)
h1 <- basehaz(fit1)
# Method 2
fit2 <- survfit(Surv(time, status=="C...