Displaying 20 results from an estimated 90 matches similar to: "confidence intervals when using polr()"
2007 Aug 20
1
rv package, rvnorm function
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
2006 Apr 13
1
Subset rows over multiple columns
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
2001 Aug 17
2
Principle Component Analysis
I have the manual for S+ 6 and I'm trying to use R for the Principle
Component Analysis example and I'm getting a few interesting answers...
The log is as follows:
R : Copyright 2001, The R Development Core Team
Version 1.3.0 (2001-06-22)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type `license()' or
2005 Dec 26
2
resorting a dataset
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
2005 Dec 21
7
use of SET command in find_by_sql
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
2008 Jun 17
3
rindex not working with objects from db model
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|
2009 Dec 15
2
[PATCH 1/2] drm/nouveau: Kill global state in NvShadowBIOS
---
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
2010 Apr 30
3
Ogv file only plays in VLC / Can't be used by most tools.
Hi,
I'm new here - thanks for having me. (Sorry if I'm in the wrong place or a noob.)
I downloaded the Theora encoder sample (ver 1.1.1), modified it to encode a sequence of bitmaps, and created an OGV file.
The OGV file plays fine in the latest VLC (1.0.5), but I can't do much else with it:
I tried uploading to YouTube, and the video just comes out really corrupt:
2002 Sep 09
1
Re: Biplot function of PCA
[was sent a wrong R-help address; manually resent by MM]
Hello
I'am using the 'biplot' and 'biplot.pincomp' functions of the 'mva'
package for my studies.
The biplot represents both the observations and the variables of a
matrix of multivariate data on the same plot.
The observations are represented by their numbers (the line of the data
matrix), but I would need to
2005 Apr 27
0
problems with nano howto load balancing adsl links
Hi all, ive been using the nano howto to load balance to adsl links for
a good while now ive got our live server running kernel 2.6.11.6 and
these links work fine.
i set up another server same model of machine and used the same kernel
config ( wanted to try some tos stuff out) 2.6.11.6 but this one doesnt
balance properly. what ever i put in table 222 (which is looked at from
all sources) it
2014 Sep 01
1
Correlation Matrix with a Covariate
R Help -
I'm trying to run a correlation matrix with a covariate of "age" and will
at some point will also want to covary other variables concurrently.
I'm using the "psych" package and have tried other methods such as writing
a loop to extract semi-partial correlations, but it does not seem to be
working. How can I accomplish this?
library(psych)
> set.cor(y =
2009 Mar 11
2
Question about datatypes/plotting issue
Hi,
I am trying to plot the Case-Shiller index found at: http://www2.standardandpoors.com/spf/pdf/index/CSHomePrice_History_022445.xls
The way I'm importing it into R is as follows:
library(gdata)
W <- read.xls("http://www2.standardandpoors.com/spf/pdf/index/CSHomePrice_History_022445.xls
", header=TRUE)
attach(W)
To give you and idea of what the data looks like:
>
2012 Aug 03
1
How can I read time series data to create zoo objects if I have two title lines?
Hello,
This is a standard example in which I read the time series data from a
csv file and create a zoo object:
x0 <- read.csv(file="CPI.csv", header=TRUE)
time_0<-as.yearmon("1981-01")+(0:371)/12
x0zoo<-zoo(x0, time_0)
The data look like this:
TIME CPI CPI_food CPI_Clothes CPI_House CPI_Rent 198101 62.1 55.34
103.45 65.24 61.43 198102 63.16 56.95
2010 Oct 06
1
selected value in a vector to make bold
I wasn't sure about the subject so I am sorry about the vagueness, but if I
have a vector of values, how do I get a certain type of vectors to be bold
or italics?
So let x be a vector from -10 to 10, how would I tell it to bold the x
values that are greater than 0? Or like absolute value of 5? Is it possible
to do this in like an if else statement? Could I use
x<-seq(-10,10,1)
2011 Jan 20
2
splitting a square symmetric matrix
So many matrices are square symmetrical (i.e. variance-covariance matrices),
is there any way to get R to split the matrix on its diagonal and just
return one diagonal?
So if I have
mat<-matrix(c(1,4,3,4,1,2,3,2,1), nrow = 3, ncol=3, byrow=TRUE)
is there anyway to get the lower right diagonal instead of the entire
symmetric matrix?
-------------------------------------------
2011 Apr 11
1
predict ordered regresssion
Is there a way to get confidence intervals around an ordered regression like
polr() in the MASS package?
-------------------------------------------
Joe King, M.A.
Ph.D. Student
University of Washington - Seattle
206-913-2912
<mailto:jp@joepking.com> jp@joepking.com
-------------------------------------------
Ad astra per aspera - "Through hardships to the stars"
2011 Jan 31
2
Rubin's rules of multiple imputation
Hello all, if I have multiple imputed data sets, is there a command or
function in R in any package you know of to combine those, I know one common
MI approach is rubins rules, is there a way to do this using his rules or
others? I know theres ways, like using Amelia from Gary King's website to
create the imputed data sets, but how to make them into one or combine them
for analysis.
2013 Feb 19
2
Cramer von Mises test for a discrete distribution
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
2009 Feb 14
2
anova help
Hi all, I am trying to run a two factor anova, but one of the factors is a
random factor, now I am also running in SPSS and it seems its dividing by
the wrong term to get the appropriate F term. here is my data. In SPSS the F
scores about double the ones in R, how can I specify one of my factors as a
random factor or change it to where it does the right model fitting? I am
using the lm command
2010 Jun 13
1
using latticeExtra plotting confidence intervals
I am wanting to plot a 95% confidence band using segplot, yet I am wanting
to have groups. For example if I have males and females, and then I have
them in different races, I want the racial groups in different panels. I
have this minor code, completely made up but gets at what I am wanting, 4
random samples and 4 samples of confidence, I know how to get A & B into one
panel and C&D in to