similar to: newbie question about running mysql

I can't run a function which generates random numbrers using linear congruential generator. My multiplier is a=5+8^6, increment is b=1 and modulo is m=2^30. the code I have written works for modulo upto m=2^28. For m= 2^29 , it says, can not allocate memory for the vector or something like that. For m= 2^31 or more, its says the argument "for i in 1:m " is too large in

Hello there Can anybody please tell me if there is any package in R to solve the following 4 nonlinear equations with 4 unknowns: alpha*exp(20/sigma)+ beta*exp(21/tau) = 2 alpha*exp(22/sigma)+ beta*exp(9/tau) = 4 alpha*exp(10/sigma)+ beta*exp(30/tau) = 6 alpha*exp(40/sigma)+ beta*exp(39/tau) = 5 where alpha = exp(lambda/sigma) beta= exp(delta/tau) I need to estimate lambda, sigma, delta, tau

Hi everyone, I''m just now really starting to look into Agile Development, and so I''m trying to gauge what the Rails community''s preference is in regards to using RSpec versus the built-in Test::Unit. I haven''t really delved much into testing in the past, I''m sad to say, but I understand why it''s beneficial to writing maintainable code and

Sorry, but this is really NOT as easy as the tutorials/books make out. I''m really struggling at the first hurdle here. And while I''m not a programmer by design I do know my way around most stuff. And if I can''t get this to work I suspect more people will have the same issues. There seems to be too many variables to address. I have winXP, I have ruby and rails all

Please forgive me if this has been answered in another post. I''ve looked around but couldn''t find a solution. I bought the book "Agile Web Development with Rails" and think I''m going to really like it. I went through the first chapter with no problems. However, as I begin developing the database on page 57, I get a consitent error: Before updating scaffolding

Can anyone suggest some step-by-step tutorials for using CVS or Subversion on Sourceforge with OS X ? I''m a new to RoR and creating a Sourceforge project was recommended as a way of working and learning from/with others. But I can''t get over the hurdle of transferring what I''ve already build to csv.sourceforge or subversion.sourceforge. All my attempts generate

I''m fairly new to Rails, and I''ve been learning from AGILE WEB DEVELOPMENT WITH RAILS. Everything has been going smoothly until the chapter on Unit Testing, where I''m getting some strange errors. I''m up to page 141 in the Agile book, and attempting to run the test program containing the method test_read_with_hash. The previous tests work properly, but I

Hey guys, I just implemented very simple and primitive class table inheritance in ActiveRecord. The goal is for this to become mature enough to become a true feature in Rails. Check it out here: http://guest@blog.raylucke.com/svn/inherits_from Here?s how it looks in action: create_table "books", :force => true do |t| t.column "product_id", :integer t.column

Apologies if this has been discussed before, but with the search function down its hard to find out if it has The first Agile book recommended using the automatically assigned row id of an object as a foreign key reference, as rails would automatically interpret the attribute (for example) product_id as the table ''product'' and row ''id''. I''ve just

Although somewhat new, I continue to struggle with passing the right parameters to the Rails methods despite making direct reference to the documentation. For example, I want to create a form: form_tag :action => ''deliver'', :id => @event.id, :class => ''entry'' The class doesn''t show up. I''ve tried various combinations of hash

In my webapp a todolist has many todo items. I am trying to display lists that are completed. By incomplete I mean that all the items in that list are done (booolean = true). I hope to have a list of active lists and complete lists on one page. I''m no ruby expert by any means so I think I have to ''pipe'' some results into another query?? Can you help please? -- Posted

Hello, I'm using pscl to run a hurdle model. Everything works great until I get to the point of making predictions. All of my "count" predictions are lower than my actual data, and lower than the "response" predictions, similar to the issue described here ( https://stat.ethz.ch/pipermail/r-help/2012-August/320426.html) and here (

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

Dear list, I am using the hurdle model for modelling the habitat of rare fish species. However I do get an error message when I try to model my data: > test_new1<-hurdle(GALUMEL~ depth + sal + slope + vrm + lat:long + offset(log(haul_numb)), dist = "negbin", data = datafit_elasmo) Error in hurdle(GALUMEL ~ depth + sal + slope + vrm + lat:long + offset(log(haul_numb)), :

I am interested in utilizing this so called "double hurdle" model in my study. We can write the model in the following way: if (z'a + u > 0 & x'b + e > 0) y = x'b + e, else y = 0 In the model, consumption y is the (left-) censored dependent variable. e and u are the normally distributed error terms. z'a is the participation equation and x'b is the

Dear Mr. or Ms.,   I would like to use the R-software to run the zero inflated mixed model and hurdle mixed model. But I do not know how to do? Would you please tell me the code and data format?   I will be very appreciated if you can help me. Thank you very much.   Best regards,   Sincerely, Xiongqing Zhang [[alternative HTML version deleted]]

I''m following along with the depot example in ''Agile Web Development'' and ran into a problem with Scaffold. I changed the MySQL table structure to add a few columns directly and also tried the migrate script to change the database after I got the initial scaffolding to work. However, I can''t seem to get the new columns to show up and am stumped as to how I can

Hello, I have been using mgcv to run GAM hurdle models, analyzing presence/absence data with GAM logistic regressions, and then analyzing the data conditional on presence (e.g. without samples with no zeros) with GAMs with a negative binomial distribution. It occurs to me that using the negative binomial distribution on data with no zeros is not right, as the negative binomial allows zeros.

Dear Listers, I have a general statistical question. Are hurdle logit-poisson model and posson model nested? Thank you so much?

Hi all-- We are planning an intervention study for adolescent alcohol use, and I am planning to use simulations based on a hurdle model (using the hurdle() function in package pscl) for sample size estimation. The simulation code and power code are below -- note that at the moment the "power" code is just returning the coefficients, as something isn't working quite right. The