search for: subject_id

Hi there, Just wondering if anyone has any tips for using arrays? I am trying to convert the following SAS code to R: data A2; set A1; by subject_id; retain BX1-BX10 i; array b(1:10) BX1-BX10 ; if first.subject_id then do ; do j=1 to 10; b(j) = .; end; i=1; end; b(i) = BX; i = i+1; if last.subject_id then output; run ; Many thanks in advance, Bronagh [[alternative...

...e following script to calculate the median for a data frame where each recorded distance has its own row, and where temp is a dataframe containing each unique SubjectID and routes is the file I describe above. for(i in 1:nrow(temp)){ temp$mediandistance[i] <- median(routes$Distance_miles[routes$Subject_ID==temp$Subject_ID[i]]) } I am interested to know... (1) Is there a way to incorporate a weighted median into this script, where the weights are the number of times each distance is recorded? (2) Can I transform my current matrix into one that gives each distance its own row? Help is much appreciat...

...r in any programming language. Anyhow, how can I calculate the SD for each person in my table? I have two patients in this R data.frame, 7200 and 23955. I extracted this from a relational database, but am I better off attempting to compute SD in SQL, or is this easily accomplished in R? * SUBJECT_ID HR 1 7200 158 2 7200 165 3 7200 138 4 7200 152 5 7200 139 6 7200 157 7 7200 186 8 23955 167 9 23955 162 10 23955 171 11 23955 139 12 23955 170 13 23955 177 14 23955 180 15 23955 176 16 23955 172 17...

Hi there, I am interested in converting SAS code to R & I wondered if anyone had any quick R code/tips for the following piece of test SAS code? Any feedback greatly appreciated. data A1; set A1; count + 1; by subject_id; if first.subject_id then count = 1; run; [[alternative HTML version deleted]]

...OS X 10.5.5; R: 2.8.1; lattice 0.17-20 library(reshape) library(lattice) plotdensitymeans <- function(data,measure,factors=c('subject_group','task'), xlab="",xlim=NULL, ...) { # Create means by subject x.melted <- melt(data, id.var = append(factors,'subject_ID'), measure.var=measure,na.rm=T) formula.bysubject.cast <- paste(factors[1],"+",factors[2],"+ subject_ID ~ .") x.cast.subject <- data.frame(cast(x.melted,formula.bysubject.cast, mean)) # Plot means by subject text.formula <- paste(factor...

...made on a specific date for a single subject. I would like to transform the data so that I have an R object with a single entry for each subject and start date and vectors for the observation dates and the observations. The data are something like the following where for each subject the subject_id does not change and the start_date does not change, but the obeservation_date and the three different observations change between rows. (There is one row for each day for each subject over a three year period although some entered the study late): 'subject_id', 'start_date',...

hi, I want to display a drop down list and when i select some option from the drop down list i want to display all the records under that selected category in the "SAME PAGE".. eg .. <%= collection_select(:question,:subject_id ,@subject, :id, :name) %> when i choose a subject i should, display all the questions under that subject in the same page.I am new to rails.Can anyone please help me out.. Thanks in advance -- Posted via http://www.ruby-forum.com/.

Hello: I have something very order to create my object def review @bit = Bit.find(:first, :select => "bits.*,subjects.id as sid, subjects.name,gaps.id as gid, gaps.gap", :joins => "left join (subjects,gaps) on (bits.subject_id = subjects.id and bits.gap_id = gaps.id)", :conditions => "bits.status=''a'' and next_review <= CURDATE()", :order => "gap,next_review,subject_id,bits.id") end But when I try to save it rails...

...ed_by"=>"", "product_type"=>"curriculum", "product"=>"", "approved"=>"N", "reviewer_email"=>"", "used_since"=>"2000", "what_i_liked"=>"", "subject_id"=>"17", "publisher_id"=>"2", "what_could_be_changed"=>""}, "submit"=>"Save"} This error seems to generate when Rails attempts to re-render the add form. Removing the ''collection_select...'' sta...

...es have an effect on the initial query issued - though not the desired on: it just mentions all the fields explicitly, but creates no joins: [4;36;1mCourse Load Including Associations (0.002771) [0m [0;1mSELECT courses.`id` AS t0_r0, courses.`name` AS t0_r1, courses.`reference` AS t0_r2, courses.`subject_id` AS t0_r3, courses.`course_type_id` AS t0_r4, courses.`description` AS t0_r5, courses.`credits` AS t0_r6, courses.`lock_version` AS t0_r7, courses.`created_on` AS t0_r8, courses.`updated_on` AS t0_r9 FROM courses ORDER BY name [0m And then, when rendering, it churns out the myriad of individual q...

...I want to display a subject drop down list and when i select some option from the drop down list i want to display all the questions under that selected category in the "SAME PAGE" and also get a form to add new questions in the same page. eg .. <%= collection_select(:question,:subject_id ,@subject, :id, :name) %> when i choose a subject i should, display all the questions under that subject in the same page and a text box to add new quesions too in the same page.I am new to rails.Can anyone please help me out.. Will page rendering partial help in any way? Thanks in advance -...

Anybody know why this: User.find(current_user).update_attribute(:last_subject, params[:subject_id]) results in this: AREL (0.6ms) UPDATE "users" SET "last_subject" = 4, "encrypted_password" = ''f470e6e76203973146c3b07e8b31c976b19cb23a9bf37485ad1911687cdc7a29'', "updated_at" = ''2011-10-12 13:43:21.727558'' WHERE "us...

...class CreateSchemesWorks < ActiveRecord::Migration def self.up create_table :schemes_works, :id => false do |t| t.references :scheme t.references :work end THE ERROR >> scheme = Scheme.last => #<Scheme id: 21, schemename: "another", colour: nil, share: nil, subject_id: nil, user_id: 2, created_at: "2010-10-05 08:17:03", updated_at: "2010-10-05 08:17:03"> >> work = Work.last => #<Work id: 5, workname: "thrd", unit_id: 4, user_id: nil, unit: nil, created_at: "2010-10-11 17:24:51", updated_at: "2010-10-11...

I have a large dataset where each Subject answered seven similar Items, which are binary yes/no questions. So I've always used Subject and Item random effects in my models, fit with lmer(), e.g.: model<-lmer(Response~Race+Gender+...+(1|Subject_ID)+(1| Item_ID),data,binomial) But I recently realized something. Most of the variables that I've tested as fixed effects are properties of the subject (e.g. Race, Gender, etc.). Is it correct to be using a random effect Subject that is nested within (partially-crossed) fixed effects like...

Hi, In a few words, can someone explain to me the NoMethodError. Googling for answers will get you to something but a direct answer from experts will give you something. NoMethodError in Book#new Showing app/views/book/new.html.erb where line #4 raised: undefined method `title'' for #<Book id: nil, created_at: nil, updated_at: nil> Extracted source (around line #4): 1: