search for: themodels

I''ve got an application that will have a handful of lookup tables. To be clear by this I mean tables that only have two attributes, id, name and are used to provide drop-down lists for other tables/forms so that these fields have "standard" values. I need 5 to 10 of these tables. I''m a ruby/rails neophyte but I''ve read Agile Web Devel with Rails, Rails

Hi, I am trying to forecast a model using predict.Arima I found arima model for a data set: x={x1,x2,x3,...,x(t)} arima_model = arima(x,order=c(1,0,1)) I am forecasting the next N lags using predict: arima_pred = predict(arima_model,n.ahead = N, se.fit=T) If I have one more point in my series, let's say x(t+1). I do not want to recalibrate themodel, I just want to forecast the next N-1

...e tried to change the na.action with no success (na.pass, na.fail, na.exclude... all give the same error message) I have also tried to follow the approach suggested by Charles Sharpsteen (http://www.mail-archive.com/r-help@r-project.org/msg74759.html) with similar results. The code is as follows: theModels <- by( theTestLineal, list( theTestLineal$ids, zongTestLineal$variable), function( dataSlice ){ linMod <- lm( value ~ seqMonth, data = dataSlice ) # Slope and intercept may be recovered from the output of the coef() function: intercept <- coef( linMod )[1] slope <- coef( linMod )[2] #...

What''s the best idion when you need to present the user a single form, whose data is loaded into several models? Issues: * How to display the errors together * How do you handle one model being valid but not the other * How do you do validations if one model''s validity depends on the other (I guess transactions could be used to handle #2 and #3...) -- Posted via

Dear useR's, I was comparing results for a logistic regression model between different library's. themodel formula is arranged as follows: response ~ (intercept) + value + group OR: glm( response ~ (intercept) + value + group , family=binomial(link='logit')) lrm( response ~ (intercept) + value + group ) ROC( from = response ~ (intercept) + value + group ,

Hello fellow RSpec users. Before you all start warming up your flame throwers please let me explain my Subject line. I''ve been working over 4 months on a large Rails project with a few other developers. Test coverage was spotty at best, though they *were* RSpec tests. One of the other developers and I had started adding more tests, mostly controller tests using the methodology