Displaying 20 results from an estimated 180 matches for "univariant".

2010 Sep 07

1

boundary correction - univariate kernel density estimation

Hey,
Does anyone know of a package in R that provides univariate kernel
density estimation with boundary correction ?
or how to easily extend an existing bivariate kernel density estimation
function (e.g. lambdahat in the spatialkernel package) with boundary
corrections to allow univariate density estimation?
Thanks a lot,
Steve B.
--
View this message in context:

2009 Oct 08

1

acf for a univariate time series in a data frame

hi everyone!
i want to check the autocorrelation function for a univariate time series
(streamflow) in a data frame as below:
< DF <- read.table("D:/file path....")
< DF
year jan feb mar apr ...... dec
1966 0.504 0.406 0.740 0.241 0.429
1967 0.683 0.529 0.780 0.443 0.503
.
.
.
.
what i first tried is:
acf (DF, plot =

2002 Oct 27

1

denoising univariate data with wavelets

Hi,
I am interested in a applying wavelets as a smoothing tool for my
(1-dimensional) data. I looked into wavetresh and waveslim packages but
could not quite figure out an obvious way to do this after running dwt or
wt functions. Would someone be able to point me in the right direction on
how to denoise univariate data using one of wavelet packages available in
R?
Thank you very much
Jane
ps

2005 Oct 22

0

Getting univariate information from a multivariate data set

A quick question that I've had only partial success in answering. I
have a multivariate dataset, and would like to extract some simple
univariate information from it grouped by treatments, etc. I am
encountering two problems however
Note: I am importing my data with
my_data <- read.csv("/path/data.csv")
1) Scoping of unstack
If I attempt
sorted_data <-

2008 Feb 02

1

ARCH LM test for univariant time series

Hi,
Does anyone know if R has a Lagrange multiplier (LM) test for ARCH
effects for univariant time series?
Thanks!
--
Tom
[[alternative HTML version deleted]]

2018 Mar 13

2

Understanding TS objects

R Help Community
I'm trying to understand time series (TS) objects. Thought I understood but recently have run into a series of error messages that I'm not sure how to handle. I have 15 years of quarterly data and I typically create a TS object via something like...
data.ts <- ts(mydata, start = 2002, frequency = 4)
this create a matric as opposed to a vector object as I receive a

2003 Jul 17

3

univariate normal mixtures

Hello,
I have a concrete statistical question:
I have a sample of an univariate mixture of an unknown number (k) of
normal distributions, each time with an unknown mean `m_i' and a
standard deviation `k * m_i', where k is known factor constant for all
the normal distributions. (The `i' is a subscript.)
Is there a function in R that can estimate the number of normal
distributions k

2008 Aug 04

2

Multivariate Regression with Weights

Hi all,
I'd like to fit a multivariate regression with the variance of the error term porportional to the predictors, like the WLS in the univariate case.
y_1~x_1+x_2
y_2~x_1+x_2
var(y_1)=x_1*sigma_1^2
var(y_2)=x_2*sigma_2^2
cov(y_1,y_2)=sqrt(x_1*x_2)*sigma_12^2
How can I specify this in R? Is there a corresponding function to the univariate specification lm(y~x,weights=x)??

2003 Sep 17

1

Bivariate Ripley K function

Hello,
I have used the univariate Ripley K function in R, but does anyone know if
there is a bivariate function built in? I have two species that I am dealing
with.
Also, how might I add error bars into the graphs (univariate and/or
bivariate)?
Thank you,
Karin Leiderman
k_leiderman at hotmail.com
Graduate Student/Research Assistant
Department of Mathematics
Univesity of New Mexico

2007 Dec 31

0

R to LaTeX Univariate Analysis

Hi all
Well, first: happy new year...
Second: I write a function in R that might interest some other people.
On the other hand, I am closer to beginners than experts; I don't know
how valuable my code is. I don't know how long it will take to me to
create a library and I don't know if it's worth to. So before starting
this long process, I would like some advices, both on the

2008 Sep 30

0

Univariate kernel density estimation with boundary correction

Hi,
Does anyone know which packages in R can deal with "univariate kernel
density estimation with boundary correction" ?
Thanks a lot.
Ying-Chao Hung

2009 Aug 13

2

Fitting a quasipoisson distribution to univariate data

Dear all,
I am analyzing counts of seabirds made from line transects at sea.
I have been fitting Poisson and negative binomial distributions to the data
using the goodfit function from the vcd library. I would also like to
evaluate how well a quasi-poisson distribution fits the data. However, none
of the potentially suitable functions I have identified (goodfit(vcd),
fitdistr(MASS),

2005 Jun 03

1

ts.intersect a multivariate and univariate ts

This seems like a FAQ, but I can't figure it out.
I have a mv ts object:
R > tsp(pg)
[1] 1982 2003 1
R > dim(pg)
[1] 22 12
and a univariate ts:
R > tsp(rw)
[1] 1690 1996 1
Yet, when I try to intersect them:
R > tsp(ts.intersect(rw, pg))
[1] 1982 2176 1
the process goes awry.
How to I get rw and pg to be one ts that runs from 1982 to 1996 and has 13
univariate time

2009 Mar 03

1

repeated measures anova, sphericity, epsilon, etc

I have 3 questions (below).
Background: I am teaching an introductory statistics course in which we are
covering (among other things) repeated measures anova. This time around
teaching it, we are using R for all of our computations. We are starting by
covering the univariate approach to repeated measures anova.
Doing a basic repeated measures anova (univariate approach) using aov()
seems

2006 Jun 19

5

multivariate splits

Dear R users!
Does someone know about any algorithms / packages in R, that perform
classification / regression / decision trees using multivariate
splits?
I have done some research, but I found nothing. Packages "tree" and
"rpart" seem only to be able to do CART with univariate splits.
Thank you for your help!
B?lint
--
Cz?cz B?lint
PhD hallgat?
BCE KTK

1999 Aug 10

1

Problems with the ts library

Well, I upgraded to a later release and have been having good luck (R vers.
0.65.0) I haven't upgraded my Red-Hat linux from 5.2 so I had to compile from
source , ... so far so good. My problem is with the time series functions
[library(ts)]. I'm trying to use the autocorrelation function-acf() and am
having problems with it. mainly an error ERROR -Couldn't find function

2011 Sep 20

2

Multivariate spline regression and predicted values

Hello,
I am trying to estimate a multivariate regression of Y on X with
regression splines. Y is (nx1), and X is (nxd), with d>1. I assume the
data is generated by some unknown regression function f(X), as in Y =
f(X) + u, where u is some well-behaved regression error. I want to
estimate f(X) via regression splines (tensor product splines). Then, I
want to get the predicted values for some new

2008 Oct 22

3

Help finding the proper function

This might not be the correct forum for this question for there might be some
flaws in my logic so the R function I'm looking for might not be the
correct, but I know there?s a lot of smart people in this forum so please
correct me if I'm wrong. I have been googling and searching in this forum
for something useful but so far I'm out of luck.
This is the background to my problem. I

2004 Oct 23

4

Plotting Bivariate Normal Data

Dear list
I have a vector of values that allegedly have a bivariate normal distribution.
I want to create a plot that shows the values I have obtained, and the
bivariate normal distribution curve for the data.
Is there a way of doing this in R?
Many thanks for your help,
Sarah.
---------------------------------
[[alternative HTML version deleted]]

2017 Sep 29

5

Converting SAS Code

Hello all,
My statistical analysis training up until this point has been entirely done
in SAS. The code I frequently used was:
*Yield Champagin;
data yield;
set stress;
if field='YV' then delete;
if field='HB' then delete;
if barcode='16187DD4015' then delete;
if barcode='16187DD6002' then delete;
if barcode='16187DD2007' then delete;
if