the sender.
-Original Message-
From: Rolf Turner [mailto:r.tur...@auckland.ac.nz]
Sent: 17. januar 2014 22:47
To: Vito Ricci
Cc: Frede Aakmann Tøgersen; Göran Broström; r-h...@stat.math.ethz.ch
Subject: Re: [R] Estimating parameters of 3 parameters lognormal
distribution
Can you
.
-Original Message-
From: Rolf Turner [mailto:r.tur...@auckland.ac.nz]
Sent: 17. januar 2014 22:47
To: Vito Ricci
Cc: Frede Aakmann Tøgersen; Göran Broström; r-h...@stat.math.ethz.ch
Subject: Re: [R] Estimating parameters of 3 parameters lognormal
distribution
Can you please tell us (me
Hi Rolf,
I fit 3 parameters lognormal in this way
myf-function(x,m,s,t)(1/((x-t)*s*(2*pi)^0.5))*exp(((-(log(x-t)-m)^2)/(2*s^2)))
then fitdistr(y, myf, list(m=1,s=1, t=2))
I choose initial parameters value seeing data, I noted that a goog estimate of
t would be 2...Me too I've some errors,
Offhand, I'd say that the issue isn't so much the starting values as the risk
of hitting the upper bound on gamma. If you get gamma set to min(x) at any
point during the iteration, the density at the corresponding point is zero, the
log-likelihood is -Inf, and poof, the magic smoke escapes.
On 19/01/14 06:20, peter dalgaard wrote:
Offhand, I'd say that the issue isn't so much the starting values as the risk of
hitting the upper bound on gamma. If you get gamma set to min(x) at any point during
the iteration, the density at the corresponding point is zero, the log-likelihood is
On 01/17/2014 08:42 AM, Vito Ricci wrote:
Hi Goran,
thanks for your suggestion, but I believe it's not helpful for me...
phreg statement Proportional hazards model with parametric baseline
hazard(s). Allows for stratification with dif-ferent scale and shape in
each stratum, and left
Emne: Re: [R] Estimating parameters of 3 parameters lognormal distribution
Hi Goran,
thanks for your suggestion, but I believe it's not helpful for me...
phreg statement Proportional hazards model with parametric baseline hazard(s).
Allows for stratification with dif-ferent scale and shape
have a look at fitdistr() and tell us if fit your needs.
Br. Frede
Oprindelig meddelelse
Fra: Vito Ricci
Dato:17/01/2014 08.44 (GMT+01:00)
Til: Göran Broström ,r-h...@stat.math.ethz.ch
Emne: Re: [R] Estimating parameters of 3 parameters lognormal distribution
Hi Goran
.
Please have a look at fitdistr() and tell us if fit your needs.
Br. Frede
Oprindelig meddelelse
Fra: Vito Ricci
Dato:17/01/2014 08.44 (GMT+01:00)
Til: Göran Broström ,r-h...@stat.math.ethz.ch
Emne: Re: [R] Estimating parameters of 3 parameters lognormal distribution
Hi Goran
Can you please tell us (me!) how you chose starting values?
Out of curiosity I tried the following:
set.seed(42)
x - rlnorm(100,1,2) + 3
require(MASS)
strt - list(mu=1,sigma=2,gamma=3)
fit - fitdistr(x,densfun=function(x,mu,sigma,gamma)
Hi guys,
is there in some R package a statement to fit parameters in a 3 parameters
lognormal distribution.
Many thanks
Vito Ricci
[[alternative HTML version deleted]]
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R-help@r-project.org mailing list
On 01/16/2014 04:59 PM, Vito Ricci wrote:
Hi guys,
is there in some R package a statement to fit parameters in a 3 parameters
lognormal distribution.
Yes, the function 'phreg' in the package 'eha'.
Göran Broström
Many thanks
Vito Ricci
[[alternative HTML version deleted]]
Hi Goran,
thanks for your suggestion, but I believe it's not helpful for me...
phreg statement Proportional hazards model with parametric baseline hazard(s).
Allows for stratification with dif-ferent scale and shape in each stratum, and
left truncated and right censored data
I've data whose
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