search for: lxhalf

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2008 Feb 12
1
Namespace/method oddity
...gt; library(stats4) > example(mle) > confint.default(fit2) Error in UseMethod("vcov") : no applicable method for "vcov" In addition: Warning message: In object$coefficients : $ operator not defined for this S4 class, returning NULL > vcov(fit2) lymax lxhalf lymax 0.02857612 -0.04870231 lxhalf -0.04870231 0.11457338 > coef(fit2) lymax lxhalf 3.218870 1.117006 And confint.default does indeed use the generic extractors vcov() and coef(). Q: is this to be expected? and why? (I kind of suspect that this has in fact been discussed at some point...
2007 Dec 06
1
suggested modification to the 'mle' documentation?
...s data via function arguments rather than global variables ll.5 <- function(ymax=15, xhalf=6, x., y.) -sum(stats::dpois(y., lambda=ymax/(1+x./xhalf), log=TRUE)) (fit.5 <- mle(ll.5, start=list(ymax=15, xhalf=6), fixed=list(x.=x, y.=y))) ll3 <- function(lymax=log(15), lxhalf=log(6), x., y.) -sum(stats::dpois(y., lambda=exp(lymax)/(1+x./exp(lxhalf)), log=TRUE)) (fit3 <- mle(ll3, start=list(lymax=0, lxhalf=0), fixed=list(x.=x, y.=y)))
2004 Dec 09
2
wishlist -- names gives slotnames (PR#7410)
Full_Name: Elizabeth Purdom Version: 1.9.1 OS: Windows XP Submission from: (NULL) (171.64.102.199) It would be nice if names(obj) would give slot names as well. Since for many people slots are new, the first thing that happens is you try to access what's in them and can't find how to do it. If you don't know that slotNames() exists, it can be very frustrating. Moreover, if you
2006 Jun 23
1
How to use mle or similar with integrate?
Hi I have the following formula (I hope it is clear - if no, I can try to do better the next time) h(x, a, b) = integral(0 to pi/2) ( ( integral(D/sin(alpha) to Inf) ( ( f(x, a, b) ) dx ) dalpha ) and I want to do an mle with it. I know how to use mle() and I also know about integrate(). My problem is to give the parameter values a and b to the