Displaying 20 results from an estimated 10000 matches similar to: "selecting by variable"
2003 Aug 23
2
help--kernel distribution dynamics
Deall all,
I'm just learning R, but unfortunately I need to
urgently do a rather more complex task so I need some
help. I have just learnt the very basics a few days
ago and am not ready yet to deal with panels and
kernel densities, so a soft guidance would be most
appreciated.
I have a (very) large panel data set (400,000
individuals x50 time periods) and need to display the
evolution of
2003 Jul 03
4
Generating a vector for breaks in a histogram
Hi
I have two lots of numbers which I would like to histogram using the hist() function. For comparative reasons, I want them to be on the same scale, which I can use the xlim and ylim options to achieve.
However, having them on the same scale is meaningless unless they have the same "breaks". Consulting the documentation, there are 4 ways of defining the number of breaks, only one
2006 Sep 21
2
R data query
Dear Sir/Madam,
I am encountering one of those alien computer momements one finds every
so often in life. See the sequence below:
> fish3.fis <-read.csv("emperor2.csv", check.names = TRUE, strip.white =
TRUE)
> colnames(fish3.fis)
[1] "Month" "Year" "FishingArea"
"SumOfTotalCatch" "CPUE"
[6]
2003 Dec 02
1
smoothing functions
Dear all,
I am trying to program an estimator which maximizes a likelihood type
objective function which is basically just lots of sums of indicator
functions of data and parameters. In order to make the optimization I
would like to smooth these functions. Since they are either 0 or 1, one
possibility is to use the normal cdf.
I am wondering whether anyone is aware of a less arbitrary choice
2003 Jul 16
4
how to handle missing values
This group impresses me, so far I have been helped with all my questions
within 24 hours. Thanks.
Therefore another one.
I am used to programs (such as STATA) where observations with missing values
that are included in a model are simply ignored in the analysis. So far I
have not been able to figure out how to deal with missing values in R and
have solved the problem by deleting observations
2003 Aug 06
3
problems with lda , data included, can somebody test with the new version
enclosed a simple R script (and a data file, and the output) , with
calls lda similar to the example with the iris data in the
documentation. it is not working and i dont understand the error
message. can anybody help me? i am using R 1.5.1 (2002.06.17) on
debian woody stable.
I would like to avoid updating now, because i want to keep the system
in "stable". can somebody test, if the
2004 Jan 23
1
how to take derivatives of a step function
Hi,
I have estimated a step function and need to take the derivatives of
this function at all points in the range. Does anyone know of any clever
ways to do this?
(I have already tried to fit a polynomial through the points in order to
obtain a smooth representation and then take derivatives of this. Also
tried to smooth it, and used an SG differentiator. Results are rather
poor so far, in
2004 Jul 02
1
help computing a covariance
Hi everyone,
(This is related to my posting on chi-squared from a day ago. I have
tried simulating this but I am still unable to calculate it analytically.)
Let y be an n times 1 vector of random normal variables mean zero
variance 1 and x be an n times k vector of random normal variables mean
zero variance 1. x and y are independent.
Then P is the projection matrix P=x*inv(x'*x)*x'
2008 Jan 16
2
Own classes in "histogram"
Hi,
I try to make a histogram from a variable that contains the number of
shoots from about 1000 individuals from a specific plant species (the range is 1-110).
Those numbers are highly skewed to the right.
My question is: how can I make my own classes with the lattice
"histogram"?
I tried it with "breaks=c(0,5,10,15,20,25,110)" but my "25-110"-class is presented
2003 Dec 15
1
distribution of second order statistic
Hi,
I am getting some weird results here and I think I am missing something.
I am trying to program a function that for a set of random variables
drawn from uniform distributions plots that distribution of the second
order statistic of the ordered variables. (ie I have n uniform
distributions on [0, w_i] for w_i different w_j and i=1..n. I want to
plot the distribution of the second order
2012 Jan 31
1
Currency symbols in Xtick or Ytick labels
How do you label Xtick and Ytick marks with Currency symbols: $2000
instead of 2000? I would like to add dollar symbols to tickmarks on
boxplots, histograms and back-to-back histograms.
My Examples (requiring the lattice and Hmisc packages):
data(case0102, package="Sleuth2")
str(case0102)
boxplot(Salary~Sex, case0102)
histogram(~ Salary | Sex, data=case0102)
require(Hmisc)
#
2009 Nov 24
4
Graphic Device - View/get all graphics
Hi Listers,
I am producing some graphics that the commands are in a FUNCTION...
The problem is that I end up viewing just last graphic and in my FUNCTION
there are 4 graphics with the PAR command function... Like those below...
How do I view/get the other 3 graphics? Any help?
Thanks in advance...
histogram<-par(mfrow=c(1,2))
hist(rw_mean_app,main='Bootstrap Method
2007 Sep 17
3
Histogram with colors
Is there a simple way to plot a histogram with colors?
For example, suppose I generate random points in the
N(2,1) distribution:
x <- rnorm(100000, mean = 2, sd = 1)
Now I would like to plot the histogram:
hist(x)
but I would like to show the bars with x < 0 in red, and the
bars with x >= 0 in lightgreen. Is there any simple way to
do it?
I think I can do it in two steps:
2007 Aug 15
4
Possible to "import" histograms in R?
Hi,
I have a large amount of data that I would like to create a histogram of and
plot and do things with in R. It is pretty much impossible to read the data
into R, so I have written a program to bin the data and now have a list of
counts in each bin. Is it possible to somehow import this into R and use
hist(), so I can, for instance, plot the probability density? I have looked
at the help page
2003 Jan 25
7
Plotting coloured histograms...
Hi, I am having some trouble trying to plot a histogram in more than one
colour. What I want to do is, plot two vectors in the same histogram, but
with different colours, for instance:
> x <- rnorm(1000,20,4);
> y <- rnorm(1000,10,2);
Then I'd like to have x and y ploted on the same hist (I can do that
already doing w <- c(x,y) then hist(w)) but the bars
2004 Aug 19
3
probability histogram question
Hello, all;
I get an unexpected result when trying to plot a probability histogram
with R1.9.1 on windows xp:
#with the following code:
> x <- runif(100,0,1)
> hist(x)
> hist(x, freq=F)
> h <- hist(x, freq=F)
> summary(h)
# Length Class Mode
#breaks 11 -none- numeric
#counts 10 -none- numeric
#intensities 10 -none- numeric
#density 10
2008 May 12
2
Cumulative lattice histograms
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2005 Apr 20
6
Histogram
Dear everybody!
I am analysing data from an enquette. The answers are either A or B. How can I
draw a histogram without transforming the data from characters to numbers? If
the data are saved in a list M, hist(M[,1]) returns:
Error in hist.default(M[, 1]) : `x' must be numeric
Execution halted
Thank you in advance!
2008 Oct 21
5
how to plot the histogram and the curve in the same graph
i want to plot the histogram and the curve in the same graph.if i have a set
of data ,i plot the histogram and also want to see what distribution it
was.So i want to plot the curve to know what distribution it like.
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2010 Nov 11
3
overlap histogram and density
Hi,
Does anybody encounter the same problem when we overlap histogram and density
that the density line seem to shift to the right a little bit?
If you do have the same problem, what should we do to correct that?
Thank you.
par(mar=c(4,4,2,1.2),oma=c(0,0,0,0))
hist(datobs,prob=TRUE, main ="Volume of a catchment from four