Displaying 20 results from an estimated 300 matches similar to: "Newbie: Selecting data"
2006 Oct 26
2
Newbie: Better way to do compound conditionals in subset?
There must be a better way to select the rows after 22-Apr-2004 and
before 01-Sep-2004 with a temperature below 65 than this:
> before2sw1 <- subset(energy.data, as.Date(start, format="%d-%b-%y") <
as.Date("01-Sep-04", format = "%d-%b-%y"))
> before2sw2 <- subset(before2sw1, as.Date(start, format="%d-%b-%y") >=
2006 Oct 20
2
Dataset on Baltimore home energy costs
I received a private request for my complete dataset from my previous
questions. In gratitude to the developers of R, and especially to the
helpful members of r-help, I'm happy to attach it. Anyone is free to use
this dataset in any manner they wish, including published books.
Attribution is not required, or even desired.
Explanatory notes on dataset:
This data is collected from monthly
2005 Jul 05
1
by (tapply) and for loop differences
I am getting a difference in results when running some analysis using by and
tapply compare to using a for loop. I've tried searching the web but had no
luck with the keywords I used.
I've attached a simple example below to illustrates my problem. I get a
difference in the mean of yvar, diff and the p-value using tapply & by
compared to a for loop. I cannot see what I am doing wrong.
2008 Sep 19
1
reproduce this graph in ggplot2 (code and data included)
How can I reproduce this graph in ggplot2 (regression lines and data
point superimposed). Thanks, Juliet
filename="http://personality-project.org/r/datasets/heating.txt"
heating=read.table(filename,header=TRUE)
symb=c(19,25,3,23)
colors=c("black","red","green","blue")
2005 Apr 04
1
need any advises for code optimization.
Dear colleagues,
I have the following code. This code is to 'filter' the data set.
It works on the data frame 'whole' with four numeric columns: a,b,d, and c.
Every row in the data frame is considered as a point in 3-D space.
Variables a,b, and d are the point's coordinates, and c is its value.
This code looks at every point, builds a cube 'centered' at this
2006 Jun 28
5
sapply question
sent this to the list yesterday but didn't see it listed in the daily
summary ... apologies if you receive it
twice ...
________________________________
From: Afshartous, David
Sent: Tuesday, June 27, 2006 10:02 AM
To: 'r-help@stat.math.ethz.ch'
Subject: sapply question
All:
I'm trying to use sapply to break up data within another function.
(tapply doens't seem to work
2013 Mar 28
3
problem with plots with short example.
i am having problem running my own data. yesterday it was working just fine. today it is not. this is the code i was using as an example to follow. this code ALSO worked just fine yesterday, and is no longer working at all. i suspect it is a problem with either my computer or the software, at this point. if THIS won't even run.... something is wrong.
i can assure you this isn't
2010 Dec 30
1
data frame subset too slow
Hi all,
First I dont have much experience with R so be gentle. OK, I am dealing
with a dataset (~ tens of thousand lines, each line ~ 10 columns of
data). I have to create some subset of this data based on some certain
conditions (for example, same first column with another dataset etc...).
Here is how I did it:
# import data
dat <- read.table( "test.txt", header=TRUE,
2010 Jun 17
2
feature request: lzma compresion (7zip)
Hello,
many linux SW is starting to implement new lzma compresson instrad of old zlib (gzip) od bzip2.
lzma is default comrpession in very good compression SW 7-zip, which is faster and have higher compression ratio then bzip2 or rar.
Currently its probalby the best compressor in therms of compression and decompression speed / compression ratio.
In linux there is GNU lzma SW which implements
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 =
2012 Jan 22
1
Problem with sapa package and spectral density function (SDF)
Hi everybody,
I'm a beginner R user and I'm trying to use the package "sapa" to
estimate the spectral density function of several time series using
the SDF function. For each time series, I want to calculate the
density function at two temporal resolutions (daily and monthly). The
monthly values calculated as a mean of the daily values. I first
create a ts object for both series
2010 Apr 24
1
Formatting numerical output
Hello,
I am new to R and am having difficulty formatting numerical output from a regression analysis. My code iteratively performs linear regression on a dataset while excluding certain data ranges.
My code:
rm(list = ls(all = TRUE))
sink("outfile")
dat <- read.table("testdat", sep="\t", header=TRUE)
int = 0.2
for (x in c(0:20)) {
subdat <- subset(dat, time
2006 Jun 01
4
refund of $63.80
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2008 Aug 07
2
help with longitudinal data plot
Dear R Help,
I am attempting to make a plot of longitudinal data, a sample data
frame of which is shown below.
I'd like to show all of the subjects in the same plot, with a set of
connecting line segments for each subject. 'age' would be the x-axis
and 'score' would be the y-axis.
subject age score
1 10123 12 51.06
2 10123 14 50.00
3 10123 15 62.22
4
2007 Oct 08
5
Dice simulation: Getting rep to re-evaluate sample()?
I'm trying to get R to simulate the sum of the values on 10 fair dice
(yes, it's related to a homework problem, but is not the problem
itself). I tried to do this:
> rep(sum(sample(1:6,100,replace=T)), times=10)
[1] 341 341 341 341 341 341 341 341 341 341
and noticed that sum(sample()) seems to be only evaluated once. How can
I overcome this, so that I get a vector of values that
2007 Feb 08
4
NEWBIE: @BOOK help?
In Henric's recent post, he included this output:
@BOOK{R:Harrell:2001,
AUTHOR = {Frank E. Harrell},
TITLE = {Regression Modeling Strategies, with Applications to
Linear Models, Survival Analysis and Logistic
Regression},
PUBLISHER = {Springer},
YEAR = 2001,
NOTE = {ISBN 0-387-95232-2},
URL =
2007 Oct 30
3
Homework help: Is this how CI using t dist are constructed?
I'm trying to replicate some of the examples from my textbook in R (my
text uses Minitab). In this problem, I'm trying to construct a 95%
confidence interval for these distance measurements [1]:
> # Case Study 7.4.1, p. 483
> x <- scan()
1: 62 52 68 23 34 45 27 42 83 56 40
12:
Read 11 items
> alpha<-.95
> mean(x) + qt(c((1-alpha)/2, 1-((1-alpha)/2)), df=length(x)-1) *
2008 Mar 20
2
Installation of R, Sweave, ESS and [X]Emacs on Windows?
I'm trying to get R, Sweave, ESS and XEmacs or emacs all installed and
working together on my Windows XP Pro system. I've got R 2.6.0 working
just fine, installed from the R Windows installer. I also have
CYGWIN_NT-5.1 with XEmacs 21.4 working okay. Can anyone point me to any
documentation on how to bring these together so that R code typed in
Xemacs can be run in R? I found the ESS
2008 May 29
1
plotting zoo using datetime as xlim
is there a way to use the actual index value for plotting zoo objects
this is the way that the index is set up and a sample range of what I would
like to plot
01/01/06 00:00:00 - 01/01/06 23:45:00
{
library(zoo)
# chron
library(chron)
fmt.chron <- function(x) {
chron(sub(" .*", "", x), gsub(".* (.*)", "\\1:00", x))
}}
x <- structure(c(15.57, 15.5,
2006 Oct 17
4
Book recommendation for newbie to stats and R?
I'm trying to learn statistics and R at the same time. I have an
undergraduate science degree and one year of calculus (30 years ago),
but never took a stats course. I hope to take some stats courses in the
next year, but thought I would start to see how much I could teach
myself.
I work for an organization that analyses behavior change communication
programs regarding HIV/AIDS and