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Terry Griffin, PhD tgriffin at uaex.edu 501.249.6360 -----Original Message----- From: Alfredo Alessandrini <alfreale74 at gmail.com> Sent: Tuesday, May 10, 2011 9:23 AM To: r-sig-geo at r-project.org Subject: [R-sig-Geo] NA...

Dear List, There has been some interest in imposing cardinality constraints in a portfolio optimization such that optimal portfolios are constrained to a minimum and maximum number of assets; recent literature has suggested genetic algorithms. One blogger suggested how this...

Terry Griffin, PhD tgriffin at uaex.edu 501.249.6360 -----Original Message----- From: Chris English <sglish at hotmail.com> Sent: Saturday, May 28, 2011 11:20 AM To: r-sig-geo at r-project.org Subject: [R-sig-Geo] Creating...

----- Original Message ----- From: "juanita choo" <juanitachoo at gmail.com> To: r-sig-geo at r-project.org Sent: Monday, December 27, 2010 11:19:42 AM GMT -06:00 US/Canada Central Subject: [R-sig-Geo] advice on spatial regression...

-----Original Message----- From: Roger Bivand <Roger.Bivand at nhh.no> Sent: Monday, September 27, 2010 6:36 AM To: Maxime Pauwels <Maxime.Pauwels at univ-lille1.fr> Cc: r-sig-geo at stat.math.ethz.ch Subject: Re: [R-sig...

----- Original Message ----- From: "Jeffrey Stratford" <jeffrey.stratford at wilkes.edu> To: r-sig-geo at r-project.org Sent: Sunday, January 23, 2011 8:26:39 PM GMT -06:00 US/Canada Central Subject: [R-sig-Geo] difficulty converting DDD...

Thank you Roger! >>> Roger Bivand <Roger.Bivand at nhh.no> 08/31/07 1:19 AM >>> On Thu, 30 Aug 2007, Terry Griffin wrote: > Greetings, > > In a simulation I'm running, I would like to create a series of listw...

----- Original Message ----- > From: "Rafael Terra" <rflterra at yahoo.com.br> > To: r-sig-geo at r-project.org > Sent: Thursday, September 15, 2011 3:00:43 PM > Subject: [R-sig-Geo] Spatial Hausman Test for Maximum Likelihood estimated models > > Dear...

Patrick, Specification of the spatial weights matrix (W) is important, and, in general, the connectedness of the W influences the estimation and inference of the model. When you say that you do not know the "true rho", I suspect you...

Julia, There are some techniques that may be useful to determine the proper connectedness of the spatial weights matrix. One method is the spatial correlogram. I've played around with other techniques such as LM tests on the residuals of...

Patrick, Good questions, the package spdep has the functions you are looking for, specifically invIrM or invIrW. I suspect you'll figure it out from there but if not, please respond back. Terry Terry Griffin, Ph.D. Associate Professor - Economics...

-----Original Message----- From: Robert J. Hijmans <r.hijmans at gmail.com> Sent: Thursday, December 23, 2010 12:00 PM To: Advait Godbole <advaitgodbole at gmail.com> Cc: r-sig-geo <r-sig-geo at stat.math.ethz.ch> Subject: Re...

Julia, >From you initial question I had assumed you had 91 sub-field observations but your latest response has me questioning if I understood the original question. Are your 91 observations in a single field or do you have 91...

Terry Griffin, PhD Assistant Professor - Economics University of Arkansas - Division of Agriculture 501.671.2182 -----Original Message----- From: Rainer M Krug <r.m.krug at gmail.com> Sent: Friday, January 07, 2011 3:44 AM To: Edzer Pebesma <edzer.pebesma...