Displaying 8 results from an estimated 8 matches for "bortz".
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bartz
2012 Feb 19
3
Non-parametric test for repeated measures and post-hoc single comparisons in R?
...;- matrix( sample( 1:7, 17*6, repl=T ),
nrow = 17, byrow = TRUE,
dimnames = list(1:17, paste( 'T', 1:6, sep='' ))
)
I found the Friedman test and the Quade test for testing the overall
hypothesis.
friedman.test( x )
quade.test( x )
However, the R help files, my text books (Bortz, Lienert and Boehnke,
2008; K?hler, Schachtel and Voleske, 2007; both German), and the
Wikipedia texts differ in what they propose as requirements for the
tests. R says that data need to be unreplicated. I read 'unreplicated'
as 'not-repeated', but is that right? If so, the exam...
2003 Nov 16
1
SE of ANOVA (aov) with repeated measures and a bewtween-subject factor
...(ANOVA) I have to
calculate the treatment effect (easy with coef(...)).
But how can I get the standard errors, or more exactly
the 98.21% confidence
intervals?
- lm() does not work with an Error()-term in the
formula
- using lme(), I can not reproduce results e.g. of an
example of a text book ((Bortz,
Statistik f?r Sozialwissenschaftler, p.412, 3.
Auflage, see at the very end)
Here what I have done (with random data):
# Random generation of data
NSubj<-30 # No. of subjects
set.seed(1234)
id<-c(1:NSubj) # ID of subjects
treat<-runif(NSubj, min=0, max=1) > 0.5 # Treatment...
2003 Mar 31
2
point-biserial correlation
Dear list,
has anyone written a package/function in R for computing a point-
biserial resp. biserial correlation?
Thanks in advance
Bernd
2003 Jun 08
2
LDA: normalization of eigenvectors (see SPSS)
Hi dear R-users
I try to reproduce the steps included in a LDA. Concerning the eigenvectors there is
a difference to SPSS. In my textbook (Bortz)
it says, that the matrix with the eigenvectors
V
usually are not normalized to the length of 1, but in the way that the
following holds (SPSS does the same thing):
t(Vstar)%*%Derror%*%Vstar = I
where Vstar are the normalized eigenvectors. Derror is an "error" or
"within"...
2006 Aug 25
1
exact Wilcoxon signed rank test with ties and the "no longer under development" exactRanksumTests package
...cannot calculate the exact values with ties.
Is there any other package that is providing a similiar test? Or is
there an easy work out how to take the ties into account? (Or a chance
that the correction is taken into account for the stats package?)
Stefan Grosse
Take the following example from Bortz/Lienert/Boehnke:
> x1<-c(9,14,8,11,14,10,8,14,12,14,13,9,15,12,9)
> x2<-c(13,15,9,12,16,10,8,13,12,16,9,10,16,12,9)
# exactRankTests package:
> wilcox.exact(x1,x2,paired=TRUE)
Exact Wilcoxon signed rank test
data: x1 and x2
V = 13, p-value = 0.1367
alternative hypothesi...
2005 Feb 18
1
Two-factorial Huynh-Feldt-Test
...Adj Pr > F
Source G - G H - F
roi*ord 0.0663 0.0591
Error(roi*ord)
Now, to do this in R, I have a short (and not very thorough) description
of it in "Lehrbuch der Statistik", Bortz and I have the script from
http://maths.newcastle.edu.au/~rking/R/help/03b/7891.html
Still, I can't figure out how to do this correctly in the two-factorial
way (and with the different models that SAS seems to use.) I'll attach
my code at the end, in case there's something that makes...
2006 Apr 17
0
Rails Developer Available for Remote Assignments
Hello
My name is Jordan Bortz and I am an experienced OOP/Web developer with over
15 years experience overall and extensive Smalltalk,C#,Java, and Web Design
experience..
I have been work with Ruby/RoR extensively lately and am looking to start
doing Ruby development projects....I am available for contracts on a
remote/te...
2006 Apr 21
0
Rails Develper Available, San Diego or Telecommute
Hello
I am somewhat new to rails but not new to web development -- I have over 10
years in software devlopment and web development....
I''m looking to do my first commercial project in rails and I am availble
for telecommute or onsite assignments (onsite if they are in San Diego)
If interested please email for more info
Jordan