[R] Access to calculations in nls

[Dermot MacSweeney]

Hi,

I would like to be able to access the calculated results from the nls package. 
Using the example in R, fm3DNase1 we can reurn certain parts of the 
calculations:

> coef(fm3DNase1)
    Asym     xmid     scal 
2.345179 1.483089 1.041454 

> resid(fm3DNase1)
 [1] -0.0136806237 -0.0126806237  0.0089488569  0.0119488569 -0.0025803222
 [6]  0.0064196778  0.0026723396 -0.0003276604 -0.0187778127 -0.0237778127
[11]  0.0381369952  0.0201369952 -0.0335131004 -0.0035131004  0.0150122651
[16] -0.0049877349
attr(,"label")
[1] "Residuals"

What I would like to be able to return are the Std. Errors shown with the 
Parameter estimates below. Is there a command such as stderr(fm3DNase1) that 
would return:

[1] 0.07815 	0.08135		0.03227

> summary(fm3DNase1)

Formula: density ~ Asym/(1 + exp((xmid - log(conc))/scal))

Parameters:
     Estimate Std. Error t value Pr(>|t|)    
Asym  2.34518    0.07815   30.01 2.16e-13 ***
xmid  1.48309    0.08135   18.23 1.22e-10 ***
scal  1.04145    0.03227   32.27 8.50e-14 ***
---
Signif. codes:  0  `***'  0.001  `**'  0.01  `*'  0.05  `.'  0.1  ` '  1 

Residual standard error: 0.01919 on 13 degrees of freedom

Correlation of Parameter Estimates:
       Asym   xmid
xmid 0.9868       
scal 0.9008 0.9063

Thanks in Advance,

Dermot MacSweeney.

**************************************************************

Dermot MacSweeney			NMRC, 
Email: dsweeney at nmrc.ucc.ie		Lee Maltings, 
Tel: +353 21 904178			Prospect Row, 
Fax: +353 21 270271			Cork, 
WWW: http://nmrc.ucc.ie			Ireland

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