Displaying 20 results from an estimated 800 matches similar to: "Multivariate function from univariate functions"
2009 Sep 28
2
re trieve user input from an tcl/tk interface
Hello everyone,
this is my first post here and I hope I signed up correctly and someone will
take me by the hand and help me out. I am new to R and cannot figure out
what to do here...
... I want to have an User Interface that requests input. I want to save
this input to a variable to use it later on. I was able to do this with a
modalDiaglog (
2013 Apr 26
1
prcomp( and cmdscale( not equivalent?
Hello,
I have a dilemma that I'm hoping the R gurus will be able to help resolve.
For background:
My data is in the form of a (dis)similarity matrix created from taking the
inverse of normalized reaction times. That is, each cell of the matrix
represents how long it took to distinguish two stimuli from one another-- a
square matrix of 45X45 where the diagonal values are all zero (since this
2011 Jan 09
2
Post hoc analysis for ANOVA with repeated measures
Dear all,
how can I perform a post hoc analysis for ANOVA with repeated measures (in
presence of a balanced design)?
I am not able to find a good example over internet in R...is there among you
someone so kind to give
me an hint with a R example please?
For example, the aov result of my analysis says that there is a statistical
difference between stimuli (there are 7 different stimuli).
...I
2006 May 04
1
Finding ties in data (be)for(e) BradleyTerry
Dear all,
I have carried out a pairwise comparison study that I want to analyze
using the BradleyTerry package to establish a rank order of my
stimuli. However, BT does not handle ties between stimuli, so I need
to find those in my data before I can use that model.
The code below goes from the format of my result file(s) to a data
frame suitable for BT, but as you can see, there are some ties. I
2011 Jan 05
2
Problem with 2-ways ANOVA interactions
Dear All,
I have a problem in understanding how the interactions of 2 ways ANOVA work,
because I get conflicting results
from a t-test and an anova. For most of you my problem is very simple I am sure.
I need an help with an example, looking at one table I am analyzing. The table
is in attachment
and can be imported in R by means of this command:
scrd<-
2003 Jun 11
1
COX PH models for event histories?
This is a question about the use of the Cox proportional hazards model to analyze event histories.
I am looking at the responses of sympathetic nervous system activity to a stimulus. The activity I observe is a burst that can only occur once per heart beat cycle (e.g., a binary count). Typically bursts occur in 60-80% of the heart cycles * sensory stimuli can modify these burst probabilities.
2011 Jan 10
2
Calculating Portfolio Standard deviation
Dear R helpers
I have following data
stocks <- c("ABC", "DEF", "GHI", "JKL")
prices_df <- data.frame(ABC = c(17,24,15,22,16,22,17,22,15,19),
DEF = c(22,28,20,20,28,26,29,18,24,21),
GHI = c(32,27,32,36,37,37,34,23,25,32),
2011 Feb 14
1
Analyzing dissimilarity ratings with Multidimensional Scaling
Dear R-list members,
I need an help with the Multidimensional Scaling analysis (MDS).
So far I used the cmdscale() command in R, but I did not get the perceptual
map I would love to see,
and I would like to know if it is possible to get it using R, and if yes
how.
I also had a look to the functions isoMDS() and sammoc() but with no luck.
I summarize the experiment I performed, and I would ask you
2005 Dec 01
1
LME & data with complicated random & correlational structures
Dear List,
This is my first post, and I'm a relatively new R user trying to work out a
mixed effects model using lme() with random effects, and a correlation
structure, and have looked over the archives, & R help on lme, corClasses, &
etc extensively for clues. My programming experience is minimal (1 semester
of C). My mentor, who has much more programming experience, but a comparable
2010 Jun 09
1
ANOVA of a sort
Dear R Help,
I have a general question - I know this is the R list, but I hope
someone can help me out a little as I've always found the help here to
be absolutely fantastic.
I have run a psychological study where participants are given multiple
stimuli and their responses to those stimuli are measured on the same
numerical scale, i.e., the data is something like
Participant Stimulus
2011 Oct 07
1
ANOVA/ANCOVA Repeated Measure Mixed Model
Hello,
I am trying to test some results I have for significance. It has been
recommended that I use R and I am completely new to this.
Set-up:
Groups: two groups of 8 subjects (16 total)
Two conditions: alert and passive
Measurements: responses for three different stimuli (A, B, and C)
measured in each condition
Experiment: Testing the order of conditions
Group one: Alert A, B
2004 Jun 21
6
Visual stimulus presentation using R?
Dear all!
Although the Psycho-Toolbox for Matlab is free software, Matlab isn't.
I'm planning to do an experiment where it's essentail to travel to the
subjects, not let the subjects come to where the Matlab licences are
:-(
So I need to use a free software for my experiment if I don't want to
by an extra Matlab licence (which I don't want to).
Did anyone ever try to do
2010 Jun 09
3
comparing two regression models with different dependent variable
Hi,
I would like to compare to regression models - each model has a different
dependent variable.
The first model uses a number that represents the learning curve for reward.
The second model uses a number that represents the learning curve from
punishment stimuli.
The first model is significant and the second isn't.
I want to compare those two models and show that they are significantly
2018 Feb 06
2
add Spectre variant 2 mitigations
On 6 February 2018 at 20:09, David Newall <openssh at davidnewall.com> wrote:
> Do we need to do anything? It's not clear to me how SSH is vulnerable to
> Spectre -- that is, how SSH can be used to execute a Spectre attack?
I am more concerned with it being the target of a Spectre style
attack. There's some long lived private data (host keys in the case
of sshd, session keys
2010 May 31
2
Ignoring initial rows in a text file import
I am trying to import a series of text files generated by stimulus
presentation software. The problem that I am having is that the number of
rows I need to skip is not fixed (depending on subject's pretest behavior)
nor is the first row of the data I want always the same (the stimuli were
presented in random order). So I need to bring in the .txt file (using
readLines?), look for the row
2008 Dec 12
1
Support vector model?
Dear All,
Apologies for sending this email to both list, but at this point I'm not
sure which one could help me the most.
I have 4 sets of data, 1 test and 3 different sets of controls.
The measurements are binary, with a matrix of 0 and 1
I'm measuring across time (rows, ~815) the behaviour of organelles in
the cell by microscopy in response to different stimuli (several
measurements
2010 May 24
5
Means do not tally
Hi all,
here is my situation
In my experiment, I expose 10 subjects to 24 different conditions of
stimuli. Each condition is exposed to the same subject 3x.
This would make each subject have 24x3=72 data points. All the subjects
combined would have 72x10=720 data points with each condition having 30
datapoints.
To find the grand average of each condition, I find the average of all the
2006 Feb 20
1
Plots: displaying mathematical symbols in specific fonts
Dear SavioRs,
I am doing some research where characters in different microsoft
fonts serve as experimental stimuli. Hence, in plot labels, I would
like to display the characters in specific microsoft fonts. I have
figured out how to display letters and numbers, but I am having
trouble with symbols such as capital delta. Before I go further, I
am using R 2.2.1 on Windows XP with everything
2011 Dec 08
1
prop.test() and the simultaneous confidence interval for multiple proportions in R
Dear list members,
I want to perform in R the analysis "simultaneous confidence interval for multiple proportions", as illustrated in the article of Agresti et al. (2008) "Simultaneous confidence intervals for comparing binomial parameter", Biometrics 64, 1270-1275.
If I am not wrong the R function implementing the Agresti et al. method is prop.test(). I ask an help because I
2012 Aug 03
0
MANOVA with repeated measures in R
Dear list member,
I deperately need an help in performing a MANOVA in R, but I encountered some
problems both in the design and in the synthax with R.
I conducted a listening experiment in which 16 participants had to rate the audio
stimuli along 5 scales representing an emotion (sad, tender, neutral, happy and aggressive).
Each audio stimulus was synthesized in order to represent a