Displaying 20 results from an estimated 300 matches similar to: "new to R, analysis of latency data"
2003 Aug 19
3
On the Use of the nnet Library
Dear List,
I am trying to solve a problem by the neural network method(library:
nnet). The problem is to express Weight in terms of Age , Sex and Height
for twenty people. The data frame consists of 20 observations with four
variables: Sex, Age, Height and Weight. Sex is treated as a factor, Age
and Weight are variables normalized to unity, as usual. I wanted to
construct a neural network, and so
2012 Jun 02
8
Error
Hello list, after somes days I have this error when I run git pull in samba4
error: Unable to find 3b6a88a1a49fdc23cd956c6583e9ec56e541eeae under
http://gitweb.samba.org/samba.git
Cannot obtain needed blob 3b6a88a1a49fdc23cd956c6583e9ec56e541eeae
while processing commit 1a596076697624545f415eb558c4647267cfe46c.
error: Fetch failed.
root at jupiter:/home/run# error: Unable to find
2008 Nov 26
1
Request for Assistance in R with NonMem
Hi
I am having some problems running a covariate analysis with my
colleage using R with the NonMem program we are using for a graduate
school project. R and NonMem run fine without adding in the
covariates, but the program is giving us a problem when the covariate
analysis is added. We think the problem is with the R code to run the
covariate data analysis. We have the control stream, R code
2023 Oct 24
1
by function does not separate output from function with mulliple parts
Colleagues,
I have written an R function (see fully annotated code below), with which I want to process a dataframe within levels of the variable StepType. My program works, it processes the data within levels of StepType, but the usual headers that separate the output by levels of StepType are at the end of the listing rather than being used as separators, i.e. I get
Regression results StepType
2006 Jun 20
1
Performance tweak when local files are not served by mongrel
Hello Zed !
I''ve experimented a simple but limited performance tweak in the mongrel
rails loader.
With the following apache 2.2 mod proxy loadbalancer setup :
# Redirect all non-static requests to cluster
RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
RewriteRule ^/(.*)$ balancer://mongrel_cluster%{REQUEST_URI} [P,QSA,L]
We can assume that mongrel is called only when the
2008 Feb 18
2
Custom Plot - means, SD & 5th-95th% (Plotmeans or Boxplot)?
Any help with this problem would be greatly appreciated:
I need to produce a custom plot i haven't come across in R. Basically, I
want to show means, 1st standard deviation and 5th and 95th percentiles
visually, using something resembling a boxplot. Is it possible to completely
customize a boxplot so that it shows means as the bar (instead of, not as
well as medians), standard deviations at
2012 Feb 29
1
Coding help
Dear Group,
I have the following dataset:
ID REPI DV CONC SS
1 1 156.84 116 0
1 2 146.56 116 0
1 3 115.13 116 0
1 4 207.81 116 0
1 5 129.53 116 0
1 6 151.48 116 0
1 7 158.95 116 0
1 8 192.37 116 0
1 9 32.97 116 0
1 10 151.66 116 0
I want to calculate the percentile of each CONC within ID=i and add as a
column
2013 Aug 29
23
[PATCH] Btrfs: optimize key searches in btrfs_search_slot
When the binary search returns 0 (exact match), the target key
will necessarily be at slot 0 of all nodes below the current one,
so in this case the binary search is not needed because it will
always return 0, and we waste time doing it, holding node locks
for longer than necessary, etc.
Below follow histograms with the times spent on the current approach of
doing a binary search when the
2011 Apr 17
3
Box plot with 5th and 95th percentiles instead of 1.5 * IQR: problems implementing an existing solution...
Hi all,
I'm just getting started with R and I would appreciate some help. I'm having
trouble creating a boxplot with whiskers at the 95th and 5th percentiles
instead of at 1.5 * IQR. I have read the relevant documentation, and checked
existing mails on this topic. I found a small modification that should work
: https://stat.ethz.ch/pipermail/r-help/2001-November/016817.html and tried
to
2012 Nov 08
3
difference percentile R vs SPSS
Dear list,
I am calculating the 95th percentile of a set of values with R and with SPSS
In R:
> normal200<-rnorm(200,0,1)
> qnorm(0.95,mean=mean(normal200),sd=sd(normal200),lower.tail =TRUE)
[1] 1.84191
In SPSS, if I use the same 200 values and select Analyze -> Descriptive Statistics -> Frequencies
and under "Statistics", I type in '95' under Percentiles,
2004 Aug 31
4
More efficient matrix computation
I have a 20x3 matrix as follows:
> m <- replicate(3, matrix(rnorm(20),20,1))
I need to compute, say, 95th and 99th percentiles of
each column such that the resulting matrix becomes 2x3
with each row representing the respective percentile.
My "best effort" is to compute one column at a time as
follows:
> quantile(m[,1], c(0.95, 0.99))
To do the same for columns 2 and 3, I
2010 Dec 17
3
box-and-whisker plots based on summary not data
Hi,
Is it possible to produce box-and-whisker plots given that I have the
median, interquartile and 5/95th centile values, but not the data from
which they come? It seems that it ought to be possible to coerce bxp
to do what I want, but I can't quite see how.
Thanks,
Matthew
--
Matthew Vernon, Research Fellow
Ecology and Epidemiology Group,
University of Warwick
2010 Jun 24
4
OT: Bandwidth calculations
Hi,
I know some of you are very experienced as to the working of
networks. I wondered whether there is some accepted way of determining
bandwidth needs based on the network traffic over time. For example,
looking at the figures for the network traffic through the server
interface, we have hourly, daily and monthly figures. If everything
were linear, taking the hourly figure and dividing it by
2017 Aug 16
1
Bias-corrected percentile confidence intervals
Hi folks,
I'm trying to estimate bias-corrected percentile (BCP) confidence
intervals on a vector from a simple for loop used for resampling. I am
attempting to follow steps in Manly, B. 1998. Randomization, bootstrap
and monte carlo methods in biology. 2nd edition., p. 48. PDF of the
approach/steps should be available here:
https://wyocoopunit.box.com/s/9vm4vgmbx5h7um809bvg6u7wr392v6i9
If
2001 Nov 25
2
Boxplots using percentiles?
The standard R boxplot appears to use quartiles to determine the height of
the rectangles and a range parameter - RNG - (default=1.5 I think) that
determines the length of the whiskers as <= RNG x Interquartile Range. Is
it possible to instead define the range as extending to the 95th percentile?
If so, how would this be done?
nb, I'm plotting multiple boxplots on a single chart so a
2008 Jan 31
1
how to customize boxplot
Dear List,
I'd like to make boxplots of a large number of observations (+/-
20.000), which are distributed log-normal and right skewed. The
problem is that with standard boxplots a too large number of
observations are displayed as outliers. I also tried to display the
log of the observations, but even then there are to may outliers to my
taste. So I'd like to change the standard IQR box
2004 Sep 01
1
AW: Looking for help in calculating percentiles
How do I calculate the 95th percentile when I know the 25th, the median and the 75th??
Thanks,
Harmony Tenney
[[alternative HTML version deleted]]
2004 Aug 10
1
Help with Normal Range Estimation for repated measures
I would be grateful if members of the list could point me in the
direction of any code (preferably in R) that will allow me to estimate
95th percentiles from a set of repeated measurements. For example, we
are interested in a clinical measurement where we have 3 measures for 14
subjects and 2 measurements on 24 subjects and single measurement on 36
subjects. We want to combine these to form a
2008 Aug 02
1
Memory Problems with a Simple Bootstrap - Part II
I have distilled my bootstrap problem down to this bit of code, which
calculates an estimate of the 95th percentile of 7500 random numbers drawn
from a standard normal distribution:
library(boot)
per95 <- function( annual.data, b.index) {
sample.data <- annual.data[b.index]
return(quantile(sample.data,probs=c(0.95))) }
m <- 10000
x <- rnorm(7500,0,1)
B <-
2007 Nov 22
3
question about extreme value distribution
Hello,
I have a question about using extreme
value distribution in R.
I have two variables, X and Y, and have pairs
of points (X1,Y1),(X2,Y2), (X3,Y3) etc.
When I plot X against Y, it looks
like the maximum value of Y (for a particular X) is
correlated with X.
Indeed, when I bin the data by X-value into
equally sized bins, and test whether the maximum
value of Y for a bin is correlated with