Displaying 20 results from an estimated 1200 matches similar to: "princomp"
2009 Mar 13
1
lsfit w/ rank-deficient x
Dear R-devel,
It seems that lsfit incorrectly reports coefficients when the input matrix 'x' is rank-deficient, see the example below:
## here values of 'b' and 'c' are incorrectly swapped
> x <- cbind(a=rnorm(100), b=0, c=rnorm(100)); y <- rnorm(100); lsfit(x, y)$coef
Intercept a b c
-0.0227787 0.1042860 -0.1729261 0.0000000
Warning
2009 Oct 25
1
lsfit residuals
I'm trying to extract the points above and below a particular lsfit. I
can only get the residuals from the original fit though.
x = runif(100, 0, 10)
plot(x)
abline(lsfit(1:100, test))
abline(lsfit(1:100, test + sd(test))) #I want the points above THIS
line.
Is there a way to use the coefficients from the fit to do this?
Thanks for any help.
2016 Apr 20
0
Solving sparse, singular systems of equations
This is not a solution but your lsfit attempt
#Error in lsfit(A, b) : only 3 cases, but 4 variables
lsfit(A,b)
gave that error because lsfit adds a column of 1 to
its first argument unless you use intercept=FALSE.
Then it will give you an answer (but I think it converts
your sparse matrix into a dense one before doing
any linear algebra).
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On
2002 May 21
1
memory management, scale
Hi experts,
1. I am working with large datasets (80000 rows, 20 columns) with R 1.3.0
und linux; so i try to save memory and remove unused objects. But even if i
remove all objects with rm() and force the garbage collector to work with
gc(), the process monitor utiliity kpm does not show a change of a single
byte in memory consumption. So what is wrong.
2. I order to scale a second dataset
1997 Apr 30
1
R-beta: ls.print
ls.print produces error that I don't seem to be able to trace.
Output of the commands as follows: (hyeung is a 24x2 matrix of data)
-------------------------------------------------
> summary(hyeung)
x.1 x.2
Min. : 28.0 Min. : 10.0
1st Qu.: 72.0 1st Qu.: 87.5
Median : 86.5 Median : 92.5
Mean : 81.0 Mean : 82.5
3rd Qu.: 97.0 3rd Qu.:100.0
Max.
1997 Apr 30
1
R-beta: ls.print
ls.print produces error that I don't seem to be able to trace.
Output of the commands as follows: (hyeung is a 24x2 matrix of data)
-------------------------------------------------
> summary(hyeung)
x.1 x.2
Min. : 28.0 Min. : 10.0
1st Qu.: 72.0 1st Qu.: 87.5
Median : 86.5 Median : 92.5
Mean : 81.0 Mean : 82.5
3rd Qu.: 97.0 3rd Qu.:100.0
Max.
2013 Apr 25
1
lsfit: Error in formatting error message
Hi,
in R-3.0 I get the following error when calling lsfit with more
observations than variables, which seems to come from an error in the
formatting of the error message (note that this was not happening in
2.15.3):
> nobs <- 5; nvar <- 6; lsfit(matrix(runif(nobs*nvar), ncol=nvar),
runif(nobs), intercept=FALSE)
Error in sprintf(ngettext(nry, "%d response", "%d
2003 Jul 21
5
how to test whether two slopes are sign. different?
Not really r-specific:
Z = (b1 - b2) / SQRT ( SEb1^2 + SEb2^2)
-------Original Message-------
From: Gijsbert Stoet <stoet at volition.wustl.edu>
Sent: 07/20/03 09:51 PM
To: r-help at stat.math.ethz.ch
Subject: [R] how to test whether two slopes are sign. different?
>
> Hi,
suppose I do want to test whether the slopes (e.g. determined with
lsfit) of two different population are
2011 Jun 16
1
Scatter plot produces "'x' and 'y' lengths differ"
Hello,
I am working on a project to create some scatter plots. I have syntax
for 26 plots, and 22 of them display as they should. But here, for
example, is a sample of the command syntax I am using:
good <- complete.cases(affect1,adh1scr)
plot
(jitter(affect1,2.0),jitter(adh1scr,1.0),xlim=c(1,35),ylim=c(1,35),pch=1
6,
main='Adherence Score by Affectiveness Level - Visit 1',
2013 Feb 26
2
Efficient way to perform linear regressions
Hi All,
I have millions of regression lines to fit. So I am looking for the
most efficient approach in R.
Details:
I have a large desing matrix X. The dimension is n by p.
Each time when fitting the model, select rows from this matrix X and
form a new design matrix, called X_current.
There is another binary matrix M, with dim m by n, and each row is a
1*n vector. It helps to determin X_current.
2016 Apr 20
6
Solving sparse, singular systems of equations
I have a situation in R where I would like to find any x (if one exists) that solves the linear system of equations Ax = b, where A is square, sparse, and singular, and b is a vector. Here is some code that mimics my issue with a relatively simple A and b, along with three other methods of solving this system that I found online, two of which give me an error and one of which succeeds on the
2013 Apr 23
2
Help: Where can I find the code for 'C_Cdqrls'?
Dear all,
I’m not sure if it is O.K. to ask this question here.
But where can I find the code for the function ‘C_Cdqrls’ which is called by the R function ‘lsfit‘.
Thank you all.
Sorry for being naïve if so.
--------------------
Ziqiang Zhao
2013-04-23
[[alternative HTML version deleted]]
2010 Jan 02
3
Help needed on applying a function across different data sets and aggregating the results into a single data set
Hi folks,
Wish y'all a Happy New Year 2010!
I need some help with the following:
Say I have lots of data sets, on which I have to apply a certain function on
the same set of columns in each of the data set. Let's take, for ex, the
typical data set is:
df1 <- as.data.frame(cbind(rnorm(10),rnorm(10)))
names(df1)[1] <- "A"
names(df1)[2] <- "B"
There are many
2001 Mar 07
1
cross-validation
The function crossval (in library bootstrap)
works well for the first degree polynomial model,
but in the case of the second degree model I got
an error message (see below).
I would be very greatfull if somebody could
give some advices for the following:
> library(bootstrap)
>
> x<-c(22,23.4,24.9,28.5,29.8,31.6,34.2,36.4,37.7,39)
>
2006 Aug 04
1
Integration and Loop in R
Dear All,
I have seldom needed to use loops in R, but now I need to code a loop
with a stride different from one.
In the R manual I downloaded I have the example:
> xc <- split(x, ind)
> yc <- split(y, ind)
> for (i in 1:length(yc)) {
plot(xc[[i]], yc[[i]]);
abline(lsfit(xc[[i]], yc[[i]]))
}
but in my case I'd like to add a condition so that i varies by 4 from
one go
2012 May 07
1
Value of Hurst exponent (R/S) method > 1
Hello,
I'm using fArma package to estimate the value of Hurst exponent using R/S
method. However, for a certain set of data I get H ~ 1.8. How do I
interpret this?
Following are the output that I get for this set:
> mean(data[,2])
[1] 400.5433
> sd(data[,2])
[1] 1139.786
>
> rsFit(data[,2], levels = 64)
Title:
Hurst Exponent from R/S Method
Call:
rsFit(x = data[, 2], levels
2010 Oct 04
2
i have aproblem --thank you
dear professor:
thank you for your help,witn your help i develop the nomogram successfully.
after that i want to do the internal validation to the model.i ues the bootpred to do it,and then i encounter problem again,just like that.(´íÎóÓÚerror to :complete.cases(x, y, wt) : ²»ÊÇËùÓеIJÎÊý¶¼Ò»Ñù³¤(the length of the augment was different))
i hope you tell me where is the mistake,and maybe i have
2010 Sep 30
2
panel.pairs in splom
Hello,
I have a customized pairs () fonction as follows that displays correctely my
data.
------------------------------------------------------------------------
panel.cor1 <- function (x, y, digits=2, prefix="")
{
usr <- par("usr"); on.exit(par(usr))
par(usr = c(0, 1, 0, 1))
r <- cor(x, y,use="pairwise.complete.obs",
2002 Jun 12
6
Rcmd on Windows
Hi there,
I was tryting to use "Rcmd SHLIB --help" on Windows RGui. However it always
gives me sytax error message. I wonder whether you have any suggestion.
Thanks in advance!
Best,
Yunda
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r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help",
2016 Apr 20
0
Solving sparse, singular systems of equations
> On 20 Apr 2016, at 13:22, A A via R-help <r-help at r-project.org> wrote:
>
>
>
>
> I have a situation in R where I would like to find any x (if one exists) that solves the linear system of equations Ax = b, where A is square, sparse, and singular, and b is a vector. Here is some code that mimics my issue with a relatively simple A and b, along with three other