Displaying 20 results from an estimated 800 matches similar to: "R function for estimating historical-VaR"
2010 Sep 23
2
dnorm
Dear R-users
Idea:
Plot a dnorm line using specific mean/sd to complete a histogram (skewed). xs:range of y-values, ys: dnorm function
Problem:
I expected to multiply the ys function with the sample size (n=250-300). I was wondering about a factor between 12'000 and 30'000 to match the size of the dnorm line with the specific histogram.
Thanks
Sibylle
hist(Biotree[Ld,]$Height2008,
2011 Dec 09
1
apply on function with vector as result
Hi,
a have some code like
myfunc <- function(x) { ...; return c(a,b) }
ys <- sapply(0:100,myfunc)
so I get something like c(c(a1,b1),c(a2,b2),...)
But now I need the "as" and "bs" in one vector
as <- apply(ys, function(c(a,b)) a)
bs <- apply(ys, function(c(a,b)) b)
Can you help me with the correct syntax, instead of my pseudo code?
thx
Christof
2011 Nov 04
3
barplot as histogram
Hello:
I'm dealing with an issue currently that I'm not sure the best way to
approach. I've got a very large (10G+) dataset that I'm trying to create
a histogram for. I don't seem to be able to use hist directly as I can
not create an R vector of size greater than 2.2G. I considered
condensing the data previous to loading it into R and just plotting
the frequencies as a
2005 Oct 16
2
Animated lissajous
Here's some code to make lissajous dance. I've attached a small sample
GIF.
Cheers,
Rob Steele
robsteele at yahoo dot com
plot.lissajous = function(omega.x, omega.y, delta = 0, num.thetas = 200)
{
thetas = seq(0, 2 * pi, length = num.thetas)
xs = sin(omega.x * thetas + delta)
ys = cos(omega.y * thetas)
plot(xs, ys, type = 'l', lwd = 3, ann = FALSE, axes = FALSE)
}
2003 Aug 04
1
Novice question
Hello.
I am new R user, so this question is probably quite stupid, but for
the life of me I cannot figure out how to get predications using
multivariate linear regression analysis. Single variable predictions
work fine. I am trying the following:
-- Known y's for known x's1 and x's2
ys <- c(133890, 135000, 135790, 137300, 138130, 139100, 139900,
141120, 141890, 143230, 144000,
2002 Jun 20
16
problem with predict()
Hi,
It is most probably just my R-ignorance, but I have following problem with
using predict(). I train the model using 164 cases and then I try to use
it on the data set with 35 cases, but I am getting 164 predictions ?
R-code below illustrates in more detail what I am doing.
Truly yours,
R
train = read.csv("train.csv", header = TRUE, row.names = "mol",
2008 Jan 22
2
contingency table on data frame
I am sorry if this is a faq or tutorial somewhere, but I am unable to
solve this one.
What I am looking for is a count of how many different
categories(numbers in this case) that appears for a given factor.
Example:
> l <- c("Yes", "No", "Perhaps")
> x <- factor( sample(l, 10, replace=T), levels=l )
> m <- c(1:5)
> y <- factor( sample(m, 10,
2011 Oct 24
1
using predict.lm() within a function
I've written a simple function to draw a regression line in a plot and
annotate the line showing the slope
with a label. It works, as I'm using it, when the horizontal variable
is 'x', but gives incorrect results otherwise.
What's wrong?
# simple function to show the slope of a line
show.beta <- function(model, x="x", x1, x2, label, col="black", ...)
2006 Mar 16
2
DIfference between weights options in lm GLm and gls.
Dear R-List users,
Can anyone explain exactly the difference between Weights options in lm glm
and gls?
I try the following codes, but the results are different.
> lm1
Call:
lm(formula = y ~ x)
Coefficients:
(Intercept) x
0.1183 7.3075
> lm2
Call:
lm(formula = y ~ x, weights = W)
Coefficients:
(Intercept) x
0.04193 7.30660
> lm3
Call:
2023 May 20
1
[libguestfs-common PATCH] Add support for OCaml 5.0
Pervasives is deprecated since Ocaml 4.08 and has been
removed in OCaml 5.0.
https://github.com/ocaml/ocaml/pull/1605
---
mlstdutils/std_utils.ml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mlstdutils/std_utils.ml b/mlstdutils/std_utils.ml
index 0d2fa22..86b21a7 100644
--- a/mlstdutils/std_utils.ml
+++ b/mlstdutils/std_utils.ml
@@ -341,12 +341,12 @@ module List =
2012 Feb 06
1
ggplot2 geom_polygon fill
Hi everyone,
i've been trying to make a special plot with ggplot2, but I can't get it to
fill the polygon I'd like to see filled so very very much.
I want to display the difference or change in the distribution of the
modified Rankin Scale between two groups. mRS is a scale for disability or
daily activities competence.
It looks like this.
2002 Jan 05
1
abline and log plots (PR#1243)
Full_Name: Stephen Eglen
Version: 1.4
OS: Redhat Linux 7.1
Submission from: (NULL) (128.252.204.36)
abline() produces a spurious line in addition to the correct line, at least with
the X11 driver. The postscript file generated also has nan values in it, which
causes an error under ghostscript.
xs <- c(0, 150, 300)
ys <- c(75, 40, 23)
par(mfrow=c(1,2))
plot(xs,ys, log="")
2006 May 08
1
ob.step$anova interpretation
hello
I built logistic regression model.
To model check I used stepAIC. But I don't know how it
is interpreted . I could not any find any explanation about it
For instance which model is preferable ? What are the critarias
to choose beter model
I will appreciate if you give me an explanation ?
models
---------
> lo1.step$anova
Stepwise Model Path
Analysis of Deviance Table
Initial
2008 Oct 28
1
Source code for ppr (Projection Pursuit Regression)
Dear R users,
I am looking for the source code of the implementation of ppr (Projection
Pursuit Regression) in R.
It will be great if citations of the source papers on which the
implementation is based, are also provided.
Thank you,
Arvind Iyer,
Grad student, Deptt. of Biomedical Engineering
Viterbi School of Engineering
University of Southern California, Los Angeles
[[alternative HTML
2016 Jul 07
2
Re: [PATCH v3 4/8] mllib: Add some imperative list manipulation functions.
On Thursday 07 July 2016 17:30:03 Richard W.M. Jones wrote:
> This adds imperative list manipulation functions inspired by Perl.
> The functions are passed list refs which get updated in place.
>
> This allows us to replace some awkward pure functional code like:
>
> let xs = ys in
> let xs = if foo then xs @ zs else xs in
>
> with:
>
> let xs = ref ys in
2013 Apr 19
1
How to select the scale parameter for Gabor transform (Rwave)?
Dear list,
I am trying to choose the scale parameter for the cgt transform but I don't
know how to do it. In time I would like to be able to separate points 30
samples apart, and in frequency I would like to separate bands 0.04 Hz
apart. I tried the two approaches described below and they gave me
different results. I would appreciate advise on how to do this.
The Rwave Gabor transform uses
2003 Aug 13
6
placing labels in polygon center ?
Dear all,
is there any function to calculate the center of a polygon mass in R?
Actually I need to find the best location within polygons to place labels.
Thanks for any hint
Jens Oehlschl?gel
--
COMPUTERBILD 15/03: Premium-e-mail-Dienste im Test\ --------...{{dropped}}
2008 Jun 05
2
Fourier Transform
Hello All,
I wanted to perform a fourier transform on high frequency financial data. I
have searched and have not found much on this topic for R. I was wondering
if anyone has used any libraries for it or have come across any papers I may
read.
Many Thanks,
Neil Gupta
[[alternative HTML version deleted]]
2004 Feb 16
1
understanding loops for "loop-plotting"
Hi,
i make some practice on "loops" to understand this important
issue in "difference" to the wrappers like apply finally!
The point is that i want plot's for different different const and wish in one
pdf the 5 plots . So i want plots for const=1:5 which change the undelying
data expressed in t1 and t2.
I attempt some trials , while, for and now
repeat loop now ,
2016 Jul 08
2
Re: [PATCH v3 4/8] mllib: Add some imperative list manipulation functions.
On Thu, Jul 07, 2016 at 06:08:43PM +0100, Richard W.M. Jones wrote:
> On Thu, Jul 07, 2016 at 07:00:46PM +0200, Pino Toscano wrote:
> > On Thursday 07 July 2016 17:30:03 Richard W.M. Jones wrote:
> > > This adds imperative list manipulation functions inspired by Perl.
> > > The functions are passed list refs which get updated in place.
> > >
> > > This