survreg (survival) reports erroneous results for left-censored data (PR#2287)

I take that back. I now get the "correct" result on Darwin R-1.6.1,  
the "wrong" result
with Carbon R-1.6.0. On a dual G4 with 10.2.2.

On Thursday, November 14, 2002, at 08:04 AM, Thomas Lumley wrote:

On Wed, 13 Nov 2002, Jan de Leeuw wrote:

No problemo. And, in fact, I get the same results in
the R-1.6.0 Carbon version.

I don't. Could there be a G3/G4 issue?

	-thomas

--- Jan

On Wednesday, November 13, 2002, at 02:05 PM, tim@timcohn.com wrote:

Full_Name: Tim Cohn
Version: 1.6.1
OS: Macintosh OS X
Submission from: (NULL) (130.11.34.250)


The Mac version of survreg does not handle left-censored data
correctly (at
least the results are not what I get doing it other ways, and they  
are
not the
same as I get running R 1.6.1 in Windows 98se;  the Windows 98  
results
are
correct).  On the windows version of R 1.6.1.

survreg(Surv(c(0,1,-1),c(T,T,F),type='left')~1,dist='gaussian')

Call:
survreg(formula = Surv(c(0, 1, -1), c(T, T, F), type = "left") ~
    1, dist = "gaussian")

Coefficients:
(Intercept)
 -0.2321569

Scale= 1.161135

Loglik(model)= -4.1   Loglik(intercept only)= -4.1
n= 3


=================

The Macintosh OS X result for the same command is:

survreg(Surv(c(0,1,-1),c(T,T,F),type='left')~1,dist='gaussian')

Call:
survreg(formula = Surv(c(0, 1, -1), c(T, T, F), type = "left") ~
    1, dist = "gaussian")

Coefficients:
(Intercept)
 -0.7373613

Scale= 1.366282

Loglik(model)= -5.6   Loglik(intercept only)= -5.6
n= 3


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===
Jan de Leeuw; Professor and Chair, UCLA Department of Statistics;
Editor: Journal of Multivariate Analysis, Journal of Statistical
Software
US mail: 9432 Boelter Hall, Box 951554, Los Angeles, CA 90095-1554
phone (310)-825-9550;  fax (310)-206-5658;  email:  
deleeuw@stat.ucla.edu
homepage: http://gifi.stat.ucla.edu

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Thomas Lumley			Asst. Professor, Biostatistics
tlumley@u.washington.edu	University of Washington, Seattle
^^^^^^^^^^^^^^^^^^^^^^^^
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===
Jan de Leeuw; Professor and Chair, UCLA Department of Statistics;
Editor: Journal of Multivariate Analysis, Journal of Statistical  
Software
US mail: 9432 Boelter Hall, Box 951554, Los Angeles, CA 90095-1554
phone (310)-825-9550;  fax (310)-206-5658;  email:  
deleeuw@stat.ucla.edu
homepage: http://gifi.stat.ucla.edu
  
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          No matter where you go, there you are. --- Buckaroo Banzai
                   http://gifi.stat.ucla.edu/sounds/nomatter.au
  
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