Displaying 20 results from an estimated 4000 matches similar to: "R update"
2008 Sep 09
1
help on wavelet
Hi,
I have little experience using wavelet and I would like to know if it is
possible,using R wavelet package, to have a plot of frequency versus time.
thank you
giov
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2008 Aug 28
1
Renaming objects
Hi,
Is there any quick and easy way to rename a number of objects, without
having to rename each one individually and then remove the old one? And
if so, is there anything I can do to adjust the associated comments
accordingly?
Thanks for any help,
Robin Williams
Met Office summer intern - Health Forecasting
robin.williams@metoffice.gov.uk
[[alternative HTML version deleted]]
2008 Sep 04
1
help on jarque test
Hi all,
I used the function jarque.test (in the moments package) on my data set and
I obtained something like this:
Jarque-Bera Normality Test
data: x
JB = 4.8381, p-value = 0.089
alternative hypothesis: greater
or
Jarque-Bera Normality Test
data: x
JB = 2.6018, p-value = 0.2723
alternative hypothesis: greater
I cannot understand this. Please, someone can help me?
thank you
2008 Aug 12
3
dixon test
Hi, I need some help using the R outliers package. I would like to perform a
Q-test (Dixon test) on my data set. I used the dixon.test function, but I
cannot understand what is the confidence level used to perform the test. I
have n=101 (n= number of data). So, can I use directly dixon.test ? What
about qdixon and qtable functions?
thank you so much!
--
View this message in context:
2008 Jul 24
4
Just 2 more questions - for now!
Hi all,
Thanks for the help with my previous post.
I have just two more questions for the minute.
I think I said in a previous post that I like to use the terminal,
i.e. run rterm.exe. On exiting the terminal, I am asked if I want to
save the workspace. If I hit y (yes), the workspace is just saved as
.rdata in my working directory, does anyone know how I can name it
directly from the
2008 Sep 11
3
periodicity validation
There is a series of data contains time in fixed step and energy
varying with time, how to test its periodicity?In R, it seems there is
no direct tools since I have search the R manual with periodic and I
have not found any related topic.
Thanks a lot
2008 Oct 20
2
calculating mean for samples
Hi everyone,
> does any one knows how can I calculate mean for different samples
> i.e. I have a data like this:
>
> s1 s2 s3 s4
> 1 0 0 0 1
> 2 1 0 1 0
> 3 0 0 0 0
> 4 0 0 0 0
> 5 0 1 0 1
> 6 1 0 0 0
> 7 0 0 0 0
> 8 0 0 0 0
> 9 0 0 0 0
> 10 0 0 0 1
>
> I need to make 5 different sample with 5
2008 Nov 04
2
Zoo seems to be running slow in R 2.8.0 windows
R version 2.8.0 (2008-10-20)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] StreamMetabolism_0.01 chron_2.3-24 zoo_1.5-4
loaded
2008 Sep 20
1
fitting a hyperbole
I have got a data set that is Gross Primary Productivity ~ Total
Suspended Solids it is a hyperbola just like:
plot(1/c(1:1000))
how do I model this relationship so that I can get all of the neat
things that lm gives residuals etc. etc. so that I can see if my
eyeball model stands up. Thanks for any help, pointers, or good
things to read.
--
Stephen Sefick
Research Scientist
Southeastern
2008 Aug 28
1
abline of an lm fit not correct
mac osx 10.5.4
R 2.7.1
I have fit a model
d<-lm(y~x)
with an R^2 of 0.963
but when I issue the command
abline(d)
the line is below where it ought to be. Looks like the right slope,
but not the right intercept.
thanks
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that are
so little or so large
2008 Oct 23
1
Reversing xlim qplot
I would like to be able to reverse the xlim on qplot
this is the code that I am using
qplot(a[,"River.Mile"], a[,26]
,ylab=colnames(a)[26], xlab="RiverMile", xlim=rev(c(60,
216)))+geom_smooth()+scale_x_continuous(breaks=c(215,202,198,190,185,179,148,119,61),
2008 Oct 29
1
Macro stuff to work on up through august 2007
Title says it all remember cast() with sum as the aggregation function
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being
2008 Nov 09
1
maptools sunrise sunset function
##This is a function that I am trying to write to calculate sunrise
and sunset and works "mostly", but returns nonsensical values. What
am I #missing? Thanks in advance.
###remember to include maptools as dependence###
library(maptools)
sunrise.set <- function(lat, long, date, timezone="UTC", num.days=1){
#this needs to be long lat#
lat.long <- matrix(c(long, lat),
2008 Oct 22
1
plotting matrix
a <- c(1:26)
b <- rnorm(25)
e <- rnorm(25)
f <- rnorm(25)
g <- data.frame(b,e, a,f)
I would like to plot a agianst all possibilities and then shoot it out
to a pdf one graph per page. I think it would be okay to have this as
a lattice plot or a ggplot with many graphs per page. I can figure
all of that out I think, but I need something like
r <- as.matrix(g)
plot(.~a, data=r)
2008 Aug 29
2
non-parametric Anova and tukeyHSD
I have insect data from twelve sites and like most environmental data
it is non-normal mostly. I would like to preform an anova and a means
seperation like tukey's HSD in a nonparametric sense (on some sort of
central tendency measure - median?). I am searching around at this
time on the internet. Any suggestions, books, etc. would be greatly
appreciated.
--
Stephen Sefick
Research
2008 Oct 20
5
Staging area for data before read into R
I am wondering if there is a better alternative than Excel for data
storage that does not require database knowledge (I will eventually
have to learn this, but it is not on my immediate todo list). I need
something that is not limited to 256 columns... I don't need any of
the built in functions in excel just a spreadsheet like program with
cells that hold data in a data.frame format for a
2008 Sep 15
4
getting data into correct format for summarizing ... reshape, aggregate, or...
I would like to reformat this data frame into something that I can
produce some descriptive statistics. I have been playing around with
the reshape package and maybe this is not the best way to proceed. I
would like to use RiverMile and constituent as the grouping variables
to get the summary statistics:
198a 198b
mean mean
sd sd
... ...
etc. for all of these.
I have tried
2008 Sep 24
2
lattice xyplot symbols instead of colors and legend matching plot symbols or colors
I would like to use the data below where the plots are close to what I
want. Instead of color I would like to use different symbols, and
have the symbols in the legend match the graphs. I am also going to
add a regression line to these I know about the type="r" (which is
fine for these particular graphs) argument, but it fits the subsets
instead of the entire data set-- should I use a
2008 Nov 01
2
Hidden line algorithms and a different kind of waterfall
This is not the same as the recent thread on a waterfall graph.
I'm thinking about the rolling FFT display used in acoustics and other
spectrum analysis tasks.
Here's an example of a very fancy 3-D waterfall display:
http://www.ultimaserial.com/UltimaWaterfall.html
I was just wondering if there are any simple hidden-line tools in R that
I could use to draw simple waterfall displays.
2008 Sep 06
1
plot a list
i have a list of 6 each containing a dataframe of 96 observations as a
zoo object. Is there a way to plot these in one frame
par(mfrow=c(3,2))
this is what I tried
lapply(d, FUN=plot)
I can provide data, list is large.
thanks
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that are
so little or so