Displaying 4 results from an estimated 4 matches for "deltavar".
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datavar
2011 Oct 10
1
variable scope for deltavar function from emdbook
Dear all,
I want to use the deltavar() function from emdbook. I can use it
directly from the command terminal but within a function it behaves weird.
Working example:
----------------------
library("emdbook")
fn <- function()
{
browser()
y <- 2
print(deltavar(y*b2, meanval=c(b2=3), Sigma=1) )
}
x <- 2
print(delt...
2008 Aug 01
1
Confidence intervals with nls()
I have data that looks like
O.lengthO.age
176 1
179 1
182 1
...
493 5
494 5
514 5
606 5
462 6
491 6
537 6
553 6
432 7
522 7
625 8
661 8
687 10
704 10
615 12
(truncated)
with a simple VonB growth model from within nls():
plot(O.length~O.age, data=OS)
Oto = nls(O.length~Linf*(1-exp(-k*(O.age-t0))), data=OS,
start=list(Linf=1000, k=0.1, t0=0.1), trace=TRUE)
mod <- seq(0, 12)
2008 Nov 03
2
standard errors for predict.nls?
Dear all,
Is there a way to retrieve standard errors from nls models? The help page tells me that arguments
such as se.fit are ignored...
Many thanks and best wishes
Christoph
--
Dr. rer.nat. Christoph Scherber
University of Goettingen
DNPW, Agroecology
Waldweg 26
D-37073 Goettingen
Germany
phone +49 (0)551 39 8807
fax +49 (0)551 39 8806
Homepage http://www.gwdg.de/~cscherb1
2008 Mar 25
1
Error propagation
Dear R-helpers,
I´m in the context of writing a general function for error propagation
in R.
There are somehow a few questions I would like to ask (discuss), as my
statistical knowledge is somewhat restricted.
Below is the function I wrote, the questions are marked.
Many thanks in advance.
propagate <- function(expr, varList, type = c("stat", "raw"), cov =
TRUE)
{