search for: posttest

Hi, I am running a learning experiment in which both training subjects and controls complete a pretest and posttest. All analyses are being conducted in R. We are looking to compare two training methodologies, and so have run this experiment twice, once with each methodology. Methodology is a between-subjects factor. Trying to run this analysis with every factor included (ie, subject as a random factor, sess...

Greetings! I am a new user of R. The only one in my department, all others use SPSS. I have two data sets of students with test scores, pretest and posttest. The first column StuNum and then columns of scores. The problem is that the lists are slightly different not all students are in both data sets. So I did: intersect(pretest$StuNum, posttest$StuNum) -> common.id At this point I need to select from pretest the students in common.id and do th...

(Have searched for this already) Hi, How do you find the strength of correlation between two variables using an ANOVA table? "Pr(>F)" gives the statistical significance of the association, but not the strength of the correlation. See data (from R) below Readable: "Df" "Sum Sq" "Mean Sq" "F value"

...for my models for a while. After that I was tweaking around and again continued writing unit tests. Earlier all my unit tests were working - successfully. But now WHen I run them, it gives me Loaded suite unit/post_test Started EEEE Finished in 0.112698 seconds. 1) Error: test_presence_of_body(PostTest): NoMethodError: undefined method `key?'' for #<String:0x103519a88> 2) Error: test_presence_of_body_and_title(PostTest): NoMethodError: undefined method `key?'' for #<String:0x1034dd420> 3) Error: test_presence_of_title(PostTest): NoMethodError: undefined method...

Is there an easy way to make graphs for the following data. I have pretest and posttest scores for men and women. I would like to form a 'titlted segment' plot for the data. That is, make segments joining the scores, with different types of segments for men and women. Example data: menpre <- c(43,42,26,39,60,60,46) menpost <- c(40,41,36,42,54,58,43) womenpre <- c(4...

...sphericity correction. Unless I use the scan function. I have not been able to access the values ​​of sum squares and degrees of freedom for each effect in the univariate summary table. Example of the car library for Anova function: library(car) phase <- factor(rep(c("pretest", "posttest", "followup"), c(5, 5, 5)), levels=c("pretest", "posttest", "followup")) hour <- ordered(rep(1:5, 3)) idata <- data.frame(phase, hour) mod.ok <- lm(cbind(pre.1, pre.2, pre.3, pre.4, pre.5, post.1, pos...

...=========== posts.yml =========== basic_post: id: 1 title: Title body: Body created_at: 2006-02-01 00:00:00 updated_at: 2006_02-02 00:00:00 =========== post_test.rb =========== require File.dirname(__FILE__) + ''/../test_helper'' class PostTest < Test::Unit::TestCase fixtures :posts def setup @post = Post.find(1) end def test_create assert_kind_of Post, @basic_post assert_equal @basic_post.id, @post.id assert_equal @basic_post.title, @post.title assert_equal @basic_post.body, @...

Hi, I am new to R (and not really a stats expert) and am having trouble interpreting its output. I am running a human learning experiment, with 6 scores per subject in both the pretest and the posttest. I believe I have fitted the correct model for my data- a mixed-effects design, with subject as a random factor and session (pre vs post) nested within group (trained vs control). I am confused about the output. The summary command gives me this table: > D.lme<- lme(score~GROUP/sessio...

Data set up as one observation/subject looks like (with a total of 10 subjects) Two treatments: shoe type with 3 categories and region with 8 categories ==> 24 "treatment" columns Subject PHallux PMidToes PLatToe PMTH1 PMidMTH PLatMTH PMidfoot PRearfoot LHallux LMidToes LLatToe LMTH1 LMidMTH LLatMTH LMidfoot LRearfoot DHallux DMidToes DLatToe DMTH1 DMidMTH DLatMTH

HI All, I have a long data file generated from a minimal pair test that I gave to learners of Arabic before and after a phonetic training regime. For each of thirty some subjects there are 800 rows of data, from each of 400 items at pre and posttest. For each item the subject got correct, there is a 'C' in the column 'Correct'. The line: tapply(ALLDATA$Correct, ALLDATA$Subject, function(x)sum(x=="C")) gives me the sum of correct answers for each subject. However, I would like to have that sum separated by Time (p...

...but there are some questions about car on R-help, so I thought this would be the correct place. ###### Example follows ##### require(car) set.seed(1) n.OBrienKaiser <- within(OBrienKaiser, age <- sample(18:35, size = 16, replace = TRUE)) phase <- factor(rep(c("pretest", "posttest", "followup"), c(5, 5, 5)), levels=c("pretest", "posttest", "followup")) hour <- ordered(rep(1:5, 3)) idata <- data.frame(phase, hour) mod.ok <- lm(cbind(pre.1, pre.2, pre.3, pre.4, pre.5, post.1, post.2, post.3, post.4, post.5, fup....

...n learning the Anova syntax in order to perform an SS type III Anova with repeated measures designs (thank you Prof. John Fox!) And another question came up: where/what are the (between/within) residuals for my model? ############ Play code: phase <- factor(rep(c("pretest", "posttest", "followup"), c(5, 5, 5)), levels=c("pretest", "posttest", "followup")) hour <- ordered(rep(1:5, 3)) idata <- data.frame(phase, hour) idata mod.ok <- lm(cbind(pre.1, pre.2, pre.3, pre.4, pre.5, post.1, post.2, post.3,...

...ntrasts, etc. For instance, let me use an example with the OBrienKaiser data set (as in the help documentation for Anova() and linearHypothesis()). The calculation of the multivariate linear model and Anova is copied from those help files: > phase <- factor(rep(c("pretest", "posttest", "followup"), c(5, 5, 5)), + levels=c("pretest", "posttest", "followup")) > hour <- ordered(rep(1:5, 3)) > idata <- data.frame(phase, hour) > mod.ok <- lm(cbind(pre.1, pre.2, pre.3, pre.4, pre.5, + post.1, post.2, p...

Hello, I''m a newbie. I need help resolving this issue. I recently added a pdf to the newsletter admin section of the website and now I can no longer view page 2 of the list of pdf''s. Nor can I login to see the newsletters as a student. I''m using Ruby 1.9.3, Rails 3.2.1. Here''s the information from the log file. ActionView::Template::Error (undefined

Does anyone know where I could get text file with the code from the famous video where they create a Weblog in 15 minutes -- The one that''s here: href="http://rubyonrails.com/screencasts? (I can''t just watch it here at work, and I''d like to avoid having to re-type everything in any case.) Thanks! -- Posted via http://www.ruby-forum.com/.