Dermot MacSweeney dsweeney at nmrc.ucc.ie
Sat Oct 14 20:33:17 CEST 2000

```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

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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```