Displaying 6 results from an estimated 6 matches for "ekol".
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ecol
2008 Dec 01
1
Spatstat - K2 index
...ilable in spatstat, but there
doesn't not appear to be one for the pair-correlation function (O-ring
statistic). As such I was planning to use a new technique (the K2
index) as described in Schiffers et al. (2008) [Ecography, 31:545-555].
The following website has more detail
[http://www.oikos.ekol.lu.se/appendixdown/E5374-example.R]. Despite
this I cannot get the function to run! I am not very familiar with R so
it is likely my problem is simple. Does anyone have any experience with
the K2-index who can give me some pointers?
Many thanks
Lauren
This message has been checked for viruse...
2009 Oct 23
3
opposite estimates from zeroinfl() and hurdle()
Dear all,
A question related to the following has been asked on R-help before, but
I could not find any answer to it. Input will be much appreciated.
I got an unexpected sign of the "slope" parameter associated with a
covariate (diam) using zeroinfl(). It led me to compare the estimates
given by zeroinfl() and hurdle():
The (significant) negative estimate here is surprising, given
2009 Mar 09
2
understanding the output from survival analysis
Why do I get different sign of the coefficients of covariates when I run the
semi-parametric proportional hazard model (coxph) compared to the parametric
proportional hazard model (survreg)?
Anyone with experience in extracting information form survreg to make
predictions are free to contact me.
Cheers,
Ullrika
[[alternative HTML version deleted]]
2009 Jun 01
1
installing sn package
...graph EXCEPT that the y-axis label is wrong. The ylab() is
ignored and the y-label is set to "v.stealspins / v.realtime". What am I
doing wrong here?
------------------------------
Message: 26
Date: Wed, 27 May 2009 13:42:50 +0200
From: "Ullrika Sahlin" <ullrika.sahlin@ekol.lu.se>
Subject: [R] Full likelihood from survreg
To: <r-help@r-project.org>
Message-ID: <002e01c9dec0$437814c0$ca683e40$@sahlin@ekol.lu.se>
Content-Type: text/plain
R users,
I am making model selection with an accelerated failure time model using the
command survreg within the li...
2009 May 27
1
Full likelihood from survreg
R users,
I am making model selection with an accelerated failure time model using the
command survreg within the library survival.
As I want to compare models with different probability distributions I need
to have the full likelihood.
How can I find out what survreg generates: the full likelihood or a
likelihood with "unnecessary" constants dropped?
Example I want to
2009 Jul 29
1
lrm-function: Interpretation and error message
I have a set of data that is not normally distributed and for which I
need to build a model. So, I tried the lrm function from the
design-package. The first run went well, and I got the following
results:
Wald Statistics Response: RVCL2PROC.mott
Factor Chi-Square d.f. P
TTV.mott (Factor+Higher Order Factors) 69.01 4