Displaying 20 results from an estimated 106 matches for "annals".
2004 Oct 04
3
(off topic) article on advantages/disadvantages of types of SS?
...of SS in the context of
unbalanced data in ANOVA, regression and ANCOVA, especially including
the use of different types of contrasts and the meaning of the
hypotheses that are tested in such cases.
Thanks for any leads.
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2008 Jul 21
2
Time Series - Long Memory Estimation
...know).
However there are three estimators already built-in the fracdiff package
(GPH, Sperio, MLE)
I was wondering if there is someone who had used an estimation introduced by
P.M. Robinson (related paper: "Log-Periodogram regression of time series
with long range dependence", 1995, The Annals of Statistics, Vol. 23, p.
1048 - 1072)
The estimator is similar to GPH and Sperio based on the periodogram.
Thank you in advance,
Fotis
--
fp
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2009 Mar 12
3
avoiding termination of nls given convergence failure
...this happens the
function stops and prints an error message, thus preventing the loop from
continuing. Is there some what of detecting the convergence problem while
preventing the nls function from stopping when this happens, so that the
loop can continue?
Bill Shipley
North American Editor, Annals of Botany
Département de biologie
Université de Sherbrooke
Sherbrooke (Québec) J1K 2R1
Canada
(819) 821-8000, poste 62079
(819) 821-8049 FAX
http://pages.usherbrooke.ca/jshipley/recherche/
[[alternative HTML version deleted]]
2011 Jan 07
2
survval analysis microarray expression data
...s:
1. Remeber the rule of thumb for a Cox model of 20 events per variable
(not n=20). Many microarray studies will have very marginal sample
size.
2. If you are looking at many genes then a completely different strategy
is required. There is a large and growing literature; I like Newton et
al, Annals of Applied Statistictis, 2007, 85-106 as an intro; but expect
to read much more.
Terry Therneau
-------- begin included message ---------
I want to test the expression of a subset of genes for correlation with
patient survival. I found out that the coxph function is appropriate
for
doing thi...
2004 Apr 26
2
mixed model with binomial link?
...nd the appropriate package in R. I have looked
at glmmML, but it doesn’t seem to allow any mixed structure beyond a
simple 2-level one. Can anyone point me to the appropriate package, so
that I don’t have to go to SAS?
Thanks.
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2004 Sep 30
1
histograms with more than one variable
...on the same graph as histograms. I suppose one could
call this a 2-d histogram? Can this be done in R? Here is a typical
data.set:
y group
1.2 1
3.3 1
2.4 2
5.7 1
0.2 2
etc.
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2006 Apr 13
1
obtaining residuals from lmer
Hello. I cannot find out how to extract the residuals from a mixed model
using the lmer function. Can someone help?
Bill Shipley
North American Editor, Annals of Botany
Editor, "Population and Community Biology" series, Springer Publishing
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2009 Jul 08
1
Dantzig Selector
...I know Emmanuel Candes has Matlab
routines to do this but I was wondering if someone had ported those to
R.
Thanks,
T
---Reference---
@article{candes2007dantzig,
title={{The Dantzig selector: statistical estimation when p is much
larger than n}},
author={Candes, E. and Tao, T.},
journal={Annals of Statistics},
volume={35},
number={6},
pages={2313--2351},
year={2007},
publisher={Hayward, Calif.[etc] Institute of Mathematical Statistics [etc]}
}
2005 Oct 17
1
mauchly.test (instead of mauchley.test) ?
Wherever I look up the following reference
the name of the author is spelled Mauchly
contrary to the naming of the R function.
Mauchly, J.W.,
Significance test for sphericity
of a normal $n$-variate distribution,
Annals of mathematical statistics, 11(1940),
p. 204-209.
Is this a typo on the original article (which
R Core has corrected) or is it a typo in the
function name ?
Best regards,
Tobias
2005 May 06
0
FW: distance between distributions
...ious case for using
the bootstrap. A paper by Mallows, the exact reference escapes me,
establishes the conditions under which asymtotics of the marginal
distribution imply a well behaved limit. Perhaps a better discussion of the
issues can be found and a pair of papers by Bickel and Freedman, see Annals
Of Statistics Vol 9, Number 6.
HTH
Phineas Campbell
>>> Vadim Ogranovich <vograno at evafunds.com> 05/06/05 1:36 AM >>>
Hi,
This is more of a general stat question. I am looking for a easily
computable measure of a distance between two empirical distributions.
Say I h...
2006 Feb 16
1
help downloading lme4 from CRAN
...mode = "wb") :
cannot open URL
`http://cran.r-project.org/bin/windows/contrib/2.0/Matrix_0.95-5.zip'
In addition: Warning message:
cannot open: HTTP status was `404 Not Found'
Can someone please explain what I am doing wrong?
Bill Shipley
North American Editor, Annals of Botany
Editor, "Population and Community Biology" series, Springer Publishing
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2008 Jan 11
1
Adding weights to ecdf
...Rao, C. R., 1997.
Statistic and True. Putting chance to work.
World Scientific Publishing.
Cox, D. R., 1969.
Some Sampling Problems in Technology.
New Developments in Survey Sampling, pg. 506--527
John Wiley, New York.
Vardi, Y., 1982.
Nonparametric estimation in the presence of length bias
The Annals of Statistics, vol. 10, num. 2 , pg. 616--620.
Gill, Richard D. and Vardi, Yehuda and Wellner, Jon A., 1988.
Large sample theory of empirical distributions in biased sampling models.
The Annals of Statistics, vol. 16, num. 3, pg. 1069--1112.
and all the references there in.
In this case, and for...
2003 Oct 28
1
setting up complicated ANOVA in R
...an these be somehow combined to include a split-plot &
repeated-measures design? If not, can I perhaps use a mixed-model
analysis with random subjects nested within the whole-plot?
Any suggestions or leads are appreciated.
Bill Shipley
Associate Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2004 Oct 22
1
p-values for the dip test
...ckage as 'qDiptab' (but at greater accuracy). n=63 is not
tabled but n=50 and 100 are. In the table for n=100 the value given for 90%
is 0.0471 so where does the 0.474 come from?
Any help appreciated!
Kylie.
[1] Hartigan JA & Hartigan PM. "The Dip Test of Unimodality", The Annals of
Statistics, v13(1):70-84, 1985.
2004 Apr 01
1
nls function
...he control parameters but this
does not always help.
Is there another non-linear regression function in R that I might try
(other than regression smoothers, which won’t give the parameter
estimates of the specified function)?
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2003 Nov 04
3
help with lme()
...but are NOT comparable if the types of contrasts are
changes? Or rather, does it simply mean that one should use t or F
tests for the fixed effects, and restrict the likelihood ratio tests to
the random effects only if using REML?
Bill Shipley
Associate Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2005 Jan 05
1
cubic spline smoother with heterogeneous variance.
...ld give me the mean
of Ln(Y) at each time (i.e. the mode of Y when back-transformed) and the
derivative of Ln(Y) with time (i.e. d(Ln(Y))/dt = dY/YDt), not dY/dt.
Can anyone suggest the best strategy for solving this problem?
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2003 Dec 11
2
typeIII SS for lme?
...ged using the non-marginal
terms in the ANOVA. However, given that type III SS is also demanded by
some… is there a function (equivalent to drop1 for lm) to obtain type
III sums of squares for mixed models using the lme function?
Bill Shipley
Associate Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]
2008 May 06
1
Type I or III SS with mixed model function lme
...) give the same
output since they correspond to Type I and III sums of squares in the SAS
terminology. At least, this is the case with normal (i.e. not mixed) linear
models. However, he finds very different results of these two types of
ANOVA tables. Why?
Bill Shipley
North American Editor, Annals of Botany
Département de biologie
Université de Sherbrooke
Sherbrooke (Québec) J1K 2R1
Canada
(819) 821-8000, poste 62079
(819) 821-8049 FAX
<http://pages.usherbrooke.ca/jshipley/recherche/>
http://pages.usherbrooke.ca/jshipley/recherche/
[[alternative HTML version deleted]]
2005 Feb 15
1
shrinkage estimates in lme
...to help determine when it is better to use the
OLS slope estimates and when to use the mixed model (lme) shrinkage
estimates? I have 35 groups but the numbers per group vary from over 50
to as low as 4.
Thanks for any help.
Bill Shipley
Subject Matter Editor, Ecology
North American Editor, Annals of Botany
Département de biologie, Université de Sherbrooke,
Sherbrooke (Québec) J1K 2R1 CANADA
Bill.Shipley@USherbrooke.ca
<http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/
[[alternative HTML version deleted]]