From p.dalgaard at biostat.ku.dk  Fri Sep  9 11:55:49 2005
From: p.dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: 09 Sep 2005 11:55:49 +0200
Subject: [Rd] nls fails to return correlation matrix (PR#8127)
In-Reply-To: <20050909093202.40C241C519@slim.kubism.ku.dk>
References: <20050909093202.40C241C519@slim.kubism.ku.dk>
Message-ID: <x2psrid0pm.fsf@turmalin.kubism.ku.dk>

Carsten.Urbach at physik.fu-berlin.de writes:

> Full_Name: Carsten Urbach
> Version: 2.1.1  (2005-06-20)
> OS: Linux
> Submission from: (NULL) (141.34.5.241)
> 
> 
> I observed one case where nls failed to return the correlation matrix, while the
> parameter estimates were computed correctly. In the follwing I include all the
> commands leading to this problem. R was started with 'R --vanilla':


.............................
> 
> Residual standard error: 0.001722 on 1 degrees of freedom
> 
> Correlation of Parameter Estimates:
>   a b c d
> b   1
> c , , 1
> d   * , 1 
> e . , * *
> attr(,"legend")
> [1] 0 ? ? 0.3 ?.? 0.6 ?,? 0.8 ?+? 0.9 ?*? 0.95 ?B? 1


And the problem was??? 

You may not like the graphical representation, but it is not a bug.

Just use

print(summary(fit),symbolic.cor=FALSE)

to get rid of it.


-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907



[Rd] nls fails to return correlation matrix (PR#8127)
Peter Dalgaard