Displaying 20 results from an estimated 1000 matches similar to: "Hierarchical Regression"
2001 Feb 07
2
Literature needed
Howdy!
Could somebody point me to some good introductory readings about data
mining and descriptive data analysis? I'm a psychologist and a couple
of times I realized that some things just don't appear in
psychological literature, e.g. I've never seen a box plot anywhere in
psych journals so I'm not familiar with them. The R help function is
great when it comes to explaining
2000 Jun 16
2
R and OpenBSD
Howdy!
Has anybody successfully installed R under OpenBSD? I just tried to
install the latest R-release under OpenBSD 2.7 and got the following
errors in the make step:
pnorm.c:62 'ML_ERR_return_NAN' undeclared
pnorm.c:62 'ML_NAN' undeclared
pnorm.c:62 'ML_NEGINF' undeclared
--Ragnar
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r-help
2000 Jun 16
2
R and OpenBSD
Howdy!
Has anybody successfully installed R under OpenBSD? I just tried to
install the latest R-release under OpenBSD 2.7 and got the following
errors in the make step:
pnorm.c:62 'ML_ERR_return_NAN' undeclared
pnorm.c:62 'ML_NAN' undeclared
pnorm.c:62 'ML_NEGINF' undeclared
--Ragnar
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r-help
2012 Nov 02
1
add1() alternative
Hi,
I'm trying to build a hierarchical logistic regression model with lme4
package, but I have a problem on selecting the variables to include in this
model.
In a simple logistic regression, using Forward selection, i use a likelihood
ratio test to check which variables i should include in the model, using the
function add1().
The problem is that this function doesn't work with the
2007 Mar 13
3
inconsistent behaviour of add1 and drop1 with a weighted linear model
Dear R Help,
I have noticed some inconsistent behaviour of add1 and drop1 with a
weighted linear model, which affects the interpretation of the results.
I have these data to fit with a linear model, I want to weight them by
the relative size of the geographical areas they represent.
_________________________________________________________________________________________
> example
2009 Apr 20
4
automatic exploration of all possible loglinear models?
Is there a way to automate fitting and assessing loglinear models for
several nominal variables . . . something akin to step or drop1 or add1
for linear or logistic regression?
Thanks.
--Chris
--
Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
40 Arch Street, Johnson City, NY 13790
cryanatbinghamtondotedu
"If you want to build a ship, don't drum
2009 Mar 20
1
CCA - manual selection
Hello,
I am trying to obtain f-values for response (independent) variables from a
CCA performed in vegan package, to see which ones of them have
significative influence in my dependent variables (like the manual selection
in canoco), but I can't find any function (or package) that do such a thing.
The dependents variables are species data, and the independents are
ambiental data.
Than you.
2000 May 03
2
GLM available book recommendation
Howdy,
I looked at the references in the R and S-Plus literature to find a
good introduction/reference to GLM. When I then went to Amazon it
seemed to me that all the recommended books are out of print.
Can anyone give me a recommendation which _available_ book to get?
--Ragnar
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r-help mailing list -- Read
2000 Apr 19
1
scale factors/overdispersion in GLM: possible bug?
I've been poking around with GLMs (on which I am *not* an expert) on
behalf of a student, particularly binomial (standard logit link) nested
models with overdispersion.
I have one possible bug to report (but I'm not confident enough to be
*sure* it's a bug); one comment on the general inconsistency that seems to
afflict the various functions for dealing with overdispersion in GLMs
2011 Jun 21
1
Stepwise Manova
Hello all,
I have a question on manova in R:
I'm using the function "manova()" from the stats package.
Is there anything like a stepwise (backward or forward) manova in R (like there is for regression and anova).
When I enter:
step(Model1, data=Mydata)
R returns the message:
Error in drop1.mlm(fit, scope$drop, scale = scale, trace = trace, k = k, :
no 'drop1'
2008 Aug 01
5
drop1() seems to give unexpected results compare to anova()
Dear all,
I have been trying to investigate the behaviour of different weights in
weighted regression for a dataset with lots of missing data. As a start
I simulated some data using the following:
library(MASS)
N <- 200
sigma <- matrix(c(1, .5, .5, 1), nrow = 2)
sim.set <- as.data.frame(mvrnorm(N, c(0, 0), sigma))
colnames(sim.set) <- c('x1', 'x2') # x1 & x2 are
2011 Nov 23
2
SPSS F-test on change in R square between hierarchical models
Hi,
I am wondering if anyone knows how to perform an F-test on the change in R
square between hierarchical models in R? SPSS provides this information and
a researcher that I am working with is interested in getting this
information. Alternatively, if someone knows how I can calculate the test
statistic (SPSS calls it F-change?) and dfs that would be helpful as well.
The output and the test I am
2001 May 02
2
rounding
Howdy!
I'm trying to print a correlation matrix where every r is rounded to
two digits after the colon. How can I get that? I tried
options(digits=2) but that rather yields two digits minimum precision
so that I get 0.0068 instead of 0.01.
Ragnar
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r-help mailing list -- Read
2005 Feb 24
2
Forward Stepwise regression based on partial F test
I am hoping to get some advise on the following:
I am looking for an automatic variable selection procedure to reduce the
number of potential predictor variables (~ 50) in a multiple regression
model.
I would be interested to use the forward stepwise regression using the
partial F test.
I have looked into possible R-functions but could not find this
particular approach.
There is a function
2007 Jun 12
2
Data transformation for chi-square test.
Dear all R users
:
I am a IT student with few statistical background and new R user for only
have two month exprience. I have a data named medcost, import by
read.table() as follow for example (real dataset has 500 cases), the
heander id means case id, member means members in a family and cost is the
family pay for medical cost every 6 months.
id member cost
1 4
2001 Mar 28
5
R and xterm
Howdy!
I have a problem that's similar to one discussed earlier on the list:
When not in xterm all the backspace and cursor-movements and stuff
are working well. Only when I start R in an xterm window backspace
appears as ^H and so on. What can I do?
Ragnar
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r-help mailing list -- Read
2003 Apr 22
4
fisher exact vs. simulated chi-square
Dear All,
I have a problem understanding the difference between the outcome of a
fisher exact test and a chi-square test (with simulated p.value).
For some sample data (see below), fisher reports p=.02337. The normal
chi-square test complains about "approximation may be incorrect",
because there is a column with cells with very small values. I
therefore tried the chi-square with
2005 Apr 15
0
code for index of canor analysis
i have search the web and not find code to cal these index.so i write one.if there exists code for such index,i hope you can let me know.
this is my first R code.i send the the list and hope uesRs give me some advise for improve it or check if i make any mistake . i appriciate your suggestion .
i have check the result roughly to the SPSS's. though i do not know excatly how SPSS calculate the
2003 Apr 22
7
Subject: Eliminate repeated components from a vector
X-Mailer: VM 7.00 under 21.4 (patch 6) "Common Lisp" XEmacs Lucid
Reply-To: fjmolina at lbl.gov
FCC: /home/f/.xemacs/mail/sent
Does anyone know how I can eliminate repeated elements from a vector?
1999 Dec 21
3
BUG in format()? (PR#383)
In RW0.651 and RW0.901,
I discovered some unexpected behaviour when I used as.matrix.data.frame()
> matrix('"', 2, 2)
[,1] [,2]
[1,] "\"" "\""
[2,] "\"" "\""
> unclass(as.data.frame(matrix('"', 2, 2)))
$V1
[1] "\"" "\""
$V2
[1] "\"" "\""