similar to: Roots of quadratic system.

Hello, I'm playing around with cluster analysis, and am looking for methods to select the number of clusters. I am aware of methods based on a 'pseudo F' or a 'pseudo T^2'. Are there packages in R that will generate these statistics, and/or other statistics to aid in cluster number selection? Thanks, John. --

Hello All, Is there a fast way to find the index(row and column) of a point in a matrix? Thanks, John. -- -------------------------------------------------------------------------- Dr. John Janmaat Department of Economics, Acadia University, Wolfville, NS, B4P 2R6 E-mail: jjanmaat at acadiau.ca Web: http://ace.acadiau.ca/~jjanmaat Tel: 902-585-1461 Fax: 902-585-1070

Hello All, I am drawing four contour plots on a 2x2 layout. I need to downsize the contour line labels. cex and labcex do not seem to work. Any suggestions? Thanks, John. -- -------------------------------------------------------------------------- Dr. John Janmaat Department of Economics, Acadia University, Wolfville, NS, B4P 2R6 E-mail: jjanmaat at acadiau.ca Web:

Hello All, I'm looking to test a variable in a logit model (glm(..., binomial(link="logit"))) for exogeneity (endogeneity). At this point I am planning to try implementing Jeffery Grogger's "A Simple Test for Exogeneity in Probit, Logit, and Poisson Regression Models", Economic Letters, 1990. To do this, I need to be able to do an instrumental variables NLS

Hello, Is there a package that implements the Cochrane-Orcutt itterative procedure for dealing with autocorrelation in a regression model? Thanks, John. -- ========================================== John Janmaat Department of Economics Acadia University, Wolfville, NS, B0P 1X0 (902)585-1461 All opinions stated are personal, unless otherwise indicated.

Dear List Is there a package for leapfrog plotting (Hamiltonian Monte Carlo estimation) in R? I tried the actual "LEAPFrOG" package which doesn't actually give the plot like this one? http://xianblog.files.wordpress.com/2010/09/hamilton.jpg How doe one plot this in R? So, there semi-circle and dots on that semi-circle. I don't think curve() or plot() would produce such plot.

Hello, I am trying to get a time derivative on a plot title. I prefer to have it in the form \dot{s_i}, but \partial s_i/\partial t would be O.K. In the graphics demo I cannot find either a dot or a partial equivalent. Thanks, John. -- ========================================== John Janmaat Department of Economics Acadia University, Wolfville, NS, B0P 1X0 (902)585-1461 All opinions stated

Hello All, Is there an analogue to \underbar or the AMS math \underline in graphical math expressions? Thanks, John. -- ===================================================================================== Dr. John Janmaat Department of Economics Acadia University Wolfville, Nova Scotia, Canada B4P 2R6 TEL: 902-585-1461 WWW: http://ace.acadiau.ca/~jjanmaat/ EMAIL: jjanmaat at acadiau.ca June

Hello, I need to solve a non-linear optimization with non-linear constraints. The 'nlm' routine does not seem to allow constraints. Is there a package for solving such problems in R? Thanks, John. -- ========================================== John Janmaat Department of Economics Acadia University, Wolfville, NS, B0P 1X0 (902)585-1461 All opinions stated are personal, unless

Hello, I have a linear model with different slopes for different treatment groups. I need to pairwise compare the different slope estimates for the different treatment groups. Is there a package that does pairwise comparisons of slope coefficients, making the appropriate adjustments in the P values? Thanks, John. -- ========================================== John Janmaat Department of

Hi all, I would like to ask that is there any function in R which can solve nonlinear system equations with several variables. Thats mean some functions similar to the 'fsolve' or 'fzero' in matlab. Thanks you Jerry _________________________________________________________________ Get 10Mb extra storage for MSN Hotmail. Subscribe Now!

Hello, I am looking for a routine to do a logistic regression. In the book "Modern Applied Statistics with S-PLUS" a function is described which uses the 'ms' command. Is there an analogue for R, or an alternative approach that can accomplish the same thing? Thanks, John. -- ========================================== John Janmaat Department of Economics Acadia

>From time to time people request symbolic computations beyond what D() and deriv() etc can provide. A brief look at the internet shows that there are many more or less developed computer algebra packages freely available. Therefore, I wondered if it would be an idea to try to 'integrate' one of these packages in R, which I guess can be done in more or less elegant ways... I do not know

Hello, I'm trying to assess the similarity of two lines that are represented as points (output of differential equation solvers). Is there a function or a package that deals with things like this? Thanks, John. ==================================================== Johannus (John) Janmaat Assistant Professor of Economics Barber School of Arts and Sciences University of British Columbia -

Hi, I'm having trouble converting code from MATLAB to R; I want to find the equivalence to MATLAB's function 'fsolve'. I've tried 'nlm', on the squared argument, in R but i did not get the same results. Thankful if helped. Best regards, Martin Englund ------------------------------------------------------------------------------ This e-mail and any attachment may

Hey, I was wondering if there existed a R function similar to 'fsolve' or 'fzero' Matlab functions? Thanks! Francois Aucoin [[alternative HTML version deleted]]

Hello, I have a fairly large problem mounting a samba share from within linux. The samba server, running Solaris 7 with Samba pre-2.0.7, has a bunch of shares on it, one of which I can mount from Windows, while logged into the ACADIA domain, but I cannot mount that share using smbmount in linux. When I log into windows, I log in with the username 033197m and my password. In smb.conf I have my

I am trying to download the R program, but am having trouble. I have read through the instructions, but do not seem to be able to do it properly. Can you tell me the step-by-step instructions? Joanne L. Butler, Post-doctoral Fellow Equity and Technology Research Project c/o Department of Sociology Acadia University Wolfville, N.S. B4P 2R6 phone (902) 585-1535 fax (902) 585-1769

Hi All, Briefly, I belong to a fisheries research group. At this time I'm working on my PhD and I'm looking for some statistical help. My mathematical and statistical skills are still scarce, I've gathered many different types of data (landings, climate and upwelling indexes, rains, etc) and I wonder about what kind of statistical procedure use with them. I'm a little confused

I just tried, on a whim, to use an OpenSSH client vs SSH 1.2.26 client, and I can connect with it... Something drastic change between pre23 and pre24? Then again, I can't get pre23 to work anymore either, after further investigation :( OpenSSH clients connect no problem, just not the old SSH 1.2.26 clients ... Marc G. Fournier marc.fournier at acadiau.ca