similar to: Identifying breakpoints/inflection points?

Dear All, I have a binomial response with one continuous predictor (d) and one factor (g) (8 levels dummy-coded). glm(resp~d*g, data, family=binomial) Y=b0+b1*X1+b2*X2 ... b7*X7 how can I get the inflection point per group, e.g., P(d)=.5 I would be grateful for any help. Thanks in advance, Ren?

Hi! Some weeks ago I discovered R. Now, I have a somewhat complicated task and am not sure whether R is the right tool to solve it. I got data of several series or measurements where I have to find the two inflection points. I did a linear regression (with ^2 and ^3 arguments), the problem there was that I had to look only at a very narrow band of measurement in order to get the

Is there any way to identify or infer the inflection points in a smooth spline object? I am doing a comparison of various methods of time-series analysis (polynomial regression, spline smoothing, recursive partitioning) and I am specifically interested in obtaining the julian dates associated with the inflection points inferred by the various models. Tyler e.g.

Hi, I have this non-linear function: y=115.251 - 118.69 * exp(-0.123517*x) I try to discovery the x value for the assyntoptic value of y and the x value where the behavior of curve change, the inflection point. How to make this? Is poss?ble to make this on R? Thanks Ronaldo -- O Flamengo e o Bangu terminaram o jogo em 0 x 0. Quem fez o gol? A Volkswagen -- | // | \\

Hi: I have a problem with the plural of fracancia, I got fragancium but in spanish is fragancia. I modified inflections in environment.rb Inflector.inflections do |i| i.irregular ''fragancia'', ''fragancias'' end but is ignored. The solution that I found was comment this inflection on inflections.rb #inflect.singular(/([ti])a$/i,

Yesterday, I opened a GitHub Issue<https://github.com/rails/rails/pull/7071> about moving Rails inflections to an initializer. The idea wasn''t received well, understandably, as generating a large initializer with new Rails apps is pretty unappealing. However, the core members seemed open to the discussion of alternatives continuing here. For those of you not in the know,

I have a model ''xp_jurisdiction_taxes'' which rails (3) created correctly. Another model ''xp_jurisdiction_states'' has many :xp_jurisdiction_taxes. In my spec I am using a shoulda helper to test the association but get the following error. BTW, greped the whole project just in case and the string ''taxi'' exists nowhere. 1)

I''m using Rails (3.0.3) and have the following code in initializers/inflections.rb ActiveSupport::Inflector.inflections do |inflect| inflect.irregular(''nursery'', ''nurseries'') end From the console I''m getting: "nursery".pluralize => "nurseries" "nurseries".singularize => "nurseries" I should be

Have a look: http://dev.rubyonrails.org/ticket/10615 This is actually a singularize method bug: >> "Business".singularize => "Busines" seems that classify uses singularize internally. Rick resolved it as invalid but I cannot understand why. Rick, could you shed some light on your decision? MK --~--~---------~--~----~------------~-------~--~----~ You received

Hello, I recently updated Rails to 3.0.5. The very same code that worked on 3.0.3 now gives error. The code is: def kategorialista Kategoria.where(:elfogadva => TRUE).order("nev").collect {|s| [s.nev, s.sefuri]} end It is in application_controller.rb with helper_method :kategorialista The error it gives on 3.0.5: SQLite3::SQLException: no such table: kategoria: SELECT

Dear all - I have followed the thread the reply to which was lead by Thomas Lumley about using pweibull to generate fitted survival curves for survreg models. http://tolstoy.newcastle.edu.au/R/help/04/11/7766.html Using the lung data set, data(lung) lung.wbs <- survreg( Surv(time, status)~ 1, data=lung, dist='weibull') curve(pweibull(x, scale=exp(coef(lung.wbs)),

Hi R help, I am trying to determine how nls() generates a function based on the self-starting SSlogis and what the formula for the function would be. I've scoured the help site, and other literature to try and figure this out but I still am unsure if I am correct in what I am coming up with. ************************************************************************** dat <-

x = c(runif(1000, 0,2.5), runif(100, 2.5, 4)) plot(ecdf(x)) You will notice a sharp turn around x = 2.5 How do I get that value of x using R? -- Thanks, Jim. [[alternative HTML version deleted]]

I'm sure there must be various peak-finding algorithms out there. Not knowing of any, I have written one myself*, but I thought I'd ask to see what's out there. Basically, I have a 2-dimensional data set and I want to identify local peaks in the data, while ignoring "trivial" peaks. My naive algorithm first identifies every peak and valley (point of inflection change

Hi. Assume you have an array of person names. I want to generate results in my view that look like this: Abby is your friend or Abby, Bob, and Carol are your friends. So I''d like to say: <%= friends.to_sentence %> <%= pluralize(friends.count, "is") %> your <%= pluralize(friends.count, "friend") %> But because pluralize puts in the

Buenas, ¿Cómo calculariais el punto de inflexion de esta curva marcado en rojo? [X] He probado de la siguiente manera: 1- Haciendo la segunda derivada:No me sirve, porque m edetecta muchas veces esos casos 2- Mirando si el siguiente valor es mayor que el anterior. No me vale, ya que si hay ruido, no lo va a detectar. 3. Mirando que el punto siguiente crezca respecto al anterior. No me

Hi, I was hoping to get some advice on how to derive estimates of slopes from four parameter logistic models fit with SSfpl. I fit the model using: model<-nls(temp~SSfpl(time,a,b,c,d)) summary(model) I am interested in the values of the lower and upper asymptotes (parameters a and b), but also in the gradient of the line at the inflection point (c) which I assume tells me my rate of

Hello, RoR seems to be aware of plurals like category=>categories etc..I Want to be able to use this in my application to relate some keywords.Is it possible ?or does RoR itself use some ruby library? Thanks Vivek -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060119/d5660663/attachment.html

Hi, when I execute dispatch.cgi at the command line, I get the following error message: [cg@cg rails]$ ./public/dispatch.cgi ./public/dispatch.cgi:3:in `require'': ./public/../config/environment.rb:8: syntax error, unexpected ''<'' (SyntaxError) <%= ''# '' if freeze %>RAILS_GEM_VERSION = ''<%= Rails::VERSION::STRING %>''

My hosting company is still supporting only Rails 1.0. I have installed Rails 1.1.2 to my vendor directory and deployed it in production which should mean that my application should be using the Rails version in my vendor diretory. But It looks like its still using local gem libraries, here is the error from dispatch.fcgi when I try and invoke my app NoMethodError (undefined method