similar to: Principle Component Analysis

Hi, I''m trying to execute something like this method in a model: def self.sql_for_rankings() sql = "SET @counter:=0;" sql << " SET @counter:=0; SELECT *, @counter:=@counter+1 AS rank FROM testscores. " find_by_sql(sql) end Where the new rank column is a kind of autoincrementer inside of

Quick question to see how I might re-sort an Activerecord data set. Let''s say I have this table: tablename: testscores | id | student | score | avg_for_year 1, steve, 85, 82 2, tom, 84, 92, 3, jim, 92, 95 In my controller, I have something like: t= Testscores.find(:all, :order => "score DESC", :limit => 2) ...where it would return the records for Jim and Steve.... My

I have a data frame where I need to subset certain rows before I compute the mean of another variable. However, the value that I need to subset by is found in multiple columns. For example, in the data below the value R0000160 is found in the first and second columns (itd_1 and itd_45). These data are student responses to multiple choice test items from a computer adaptive test. So, the variable

In an attempt to learn to use the rv package, I have been working through the examples in Jouni Kerman and Andrew Gelman's "Using Random Variables to Manipulate and Summarize Simulations in R" (July 4, 2007). I am using a Dell Precision 380n computer running Gentoo Linux and R 2.2.1 (the latest available through Gentoo's portage/emerge system). Everything worked well until I

Hello, I am running a model with four categories and want predicted probabilities in each category. Now for this example I wont give a counterfactual just the training data is fine but is there anyway to get a confidence interval around the predicted probabilities in each group? I have tried but it gives me probabilities and I have used interval="confidence", level=.095 and then interval

I''m sorting a separate list that doesn''t contain a certain user''s attribute, but trying to but that certain user''s attribute on the separate percentile. test_scores = Testscore.find(:all, :conditions=> {...}) my_testscore = current_user.test_score my_ts = Testscore.new(:score => my_testscore) test_scores.push(ts) sorted_ts = test_scores.sort {|x,y|

--- drivers/gpu/drm/nouveau/nouveau_bios.c | 47 ++++++++++++++----------------- 1 files changed, 21 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c index 5eec5ed..04ac564 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bios.c +++ b/drivers/gpu/drm/nouveau/nouveau_bios.c @@ -181,43 +181,42 @@ struct methods { const char

Hi, ? I'm trying to carry out Cramer von Mises tests between pairs of vectors belonging to a discrete distribution (concretely frequencies from 0 to 200). However, the program crashes in the attempt. The problem seems to be that these vectors only have positive integer numbers (+ zero). When I add a random very small positive decimal to the non-decimal part everything works fine (files prm1