Displaying 20 results from an estimated 2000 matches similar to: "randomForest partial dependence plots"
2010 Nov 13
2
interpretation of coefficients in survreg AND obtaining the hazard function for an individual given a set of predictors
Dear R help list,
I am modeling some survival data with coxph and survreg (dist='weibull') using
package survival. I have 2 problems:
1) I do not understand how to interpret the regression coefficients in the
survreg output and it is not clear, for me, from ?survreg.objects how to.
Here is an example of the codes that points out my problem:
- data is stc1
- the factor is dichotomous
2010 Nov 15
1
interpretation of coefficients in survreg AND obtaining the hazard function
1. The weibull is the only distribution that can be written in both a
proportional hazazrds for and an accelerated failure time form. Survreg
uses the latter.
In an ACF model, we model the time to failure. Positive coefficients
are good (longer time to death).
In a PH model, we model the death rate. Positive coefficients are
bad (higher death rate).
You are not the first to be confused
2010 Nov 16
1
Re : interpretation of coefficients in survreg AND obtaining the hazard function for an individual given a set of predictors
Thanks for sharing the questions and responses!
Is it possible to appreciate how much the coefficients matter in one
or the other model?
Say, using Biau's example, using coxph, as.factor(grade2 ==
"high")TRUE gives hazard ratio 1.27 (rounded).
As clinician I can grasp this HR as 27% relative increase. I can
relate with other published results.
With survreg the Weibull model gives a
2012 Nov 22
1
Partial dependence plot in randomForest package (all flat responses)
Hi,
I'm trying to make a partial plot with package randomForest in R. After I
perform my random forest object I type
partialPlot(data.rforest, pred.data=act2, x.var=centroid, "C")
where data.rforest is my randomforest object, act2 is the original dataset,
centroid is one of the predictor and C is one of the classes in my response
variable.
Whatever predictor or response class I
2011 Aug 04
1
randomForest partial dependence plot variable names
Hello,
I am running randomForest models on a number of species. I would like to be
able to automate the printing of dependence plots for the most important
variables in each model, but I am unable to figure out how to enter the
variable names into my code. I had originally thought to extract them from
the $importance matrix after sorting by metric (e.g. %IncMSE), but the
importance matrix is n
2008 Feb 14
1
Package for Multiple Additive Regression Trees
Hello List,
I've been unsuccessful in tracking down a package that does MART. J
Friedman's website has a page that mentions an R implementation but the
links lead nowhere. There is also a nice walkthru/vignette pdf on his site.
But I can not find this package anywhere. Perhaps it's commercial? Does
anyone know of where it might be available or of any other R package (or
Matlab
2012 Apr 11
4
Partial Dependence and RandomForest
Hello all~
I am interested in clarifying something more conceptual, so I won't be
providing any data or code here.
>From what I understand, partial dependence plots can help you understand the
relative dependence on a variable, and the subsequent values of that
variable, after "averaging out the effects" of the other input variables.
This is great, but what I am interested in
2009 Dec 23
7
[Bug 25777] New: Blank Screen on Gt230M
http://bugs.freedesktop.org/show_bug.cgi?id=25777
Summary: Blank Screen on Gt230M
Product: xorg
Version: git
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/nouveau
AssignedTo: nouveau at lists.freedesktop.org
ReportedBy:
2007 Apr 18
0
[patch 2/9] Guest page hinting: unused / free pages on s390.
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
From: Hubertus Franke <frankeh@watson.ibm.com>
From: Himanshu Raj <rhim@cc.gatech.edu>
[patch 2/9] Guest page hinting: unused / free pages on s390.
s390 uses the milli-coded ESSA instruction to set the page state. The
page state is formed by four guest page states called block usage states
and three host page states called block
2007 Apr 18
0
[patch 2/9] Guest page hinting: unused / free pages on s390.
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
From: Hubertus Franke <frankeh@watson.ibm.com>
From: Himanshu Raj <rhim@cc.gatech.edu>
[patch 2/9] Guest page hinting: unused / free pages on s390.
s390 uses the milli-coded ESSA instruction to set the page state. The
page state is formed by four guest page states called block usage states
and three host page states called block
2004 Mar 11
3
widen the screen place
I have this problem: my screen seems not wide enough in R. My true
computer monitor is very wide, so I wish that I can line up the text
when I stretch it wide. i.e.:
This is typical R returns:
> summary(a)
V1 V2 V3 V4
F:625 Min. :20020103 EMC : 34 Min. : 9300300
L:944 1st Qu.:20020530 BRW : 27 1st Qu.: 9323865
2011 Jan 24
1
Extracting information from text data
Hi R-Users,
Thanks in advance.
I am using R-2.12.0 on Windows XP.
I am trying to produce an n X m matrix from text data stored in different files. Where n = number of words (say w1, w2, …, wn). M is the number of documents (say d1, d2, …, dm)
A. Using package tm
I am using package tm to do the job. I have provided the code below:
> my.corpus <- Corpus(DirSource(my.path),
2011 Jul 11
3
NetCDF, open *.nc
*Good day!*
I'm using Vista(x64) and R 2.13.0(x64) (with ncdf and RnetCDF packs)
*I have a problem:* I'm trying to open **.nc* file and I use this script
(http://r.789695.n4.nabble.com/Problem-downloading-and-opening-netcdf-file-td3046897.html#a3046965)
library(ncdf)
link <-
"http://ibis.grdl.noaa.gov/SAT/SeaLevelRise/slr/slr_sla_gbl_free_all_66.nc"
dest <-
2007 Feb 16
2
How is the line in av.plot calculated?
I suspect that the line in the added variable plot (library car) is a SLR of
the residuals, but I can't seem to find this written anywhere. Can someone
confirm this? Thanks.
Tom
[[alternative HTML version deleted]]
2016 Dec 22
2
struct bitfield regression between 3.6 and 3.9 (using -O0)
Here's our testcase:
#include <stdio.h>
struct flags {
unsigned frog: 1;
unsigned foo : 1;
unsigned bar : 1;
unsigned bat : 1;
unsigned baz : 1;
unsigned bam : 1;
};
int main() {
struct flags flags;
flags.bar = 1;
flags.foo = 1;
if (flags.foo == 1) {
printf("Pass\n");
return 0;
} else {
2016 Dec 22
0
struct bitfield regression between 3.6 and 3.9 (using -O0)
On 12/21/2016 4:45 PM, Phil Tomson via llvm-dev wrote:
> Here's our testcase:
>
> #include <stdio.h>
>
> struct flags {
> unsigned frog: 1;
> unsigned foo : 1;
> unsigned bar : 1;
> unsigned bat : 1;
> unsigned baz : 1;
> unsigned bam : 1;
> };
>
> int main() {
> struct flags flags;
> flags.bar = 1;
>
2008 Oct 15
0
Iterative estimation of linear regression model
Dear all
I am intrested in making iterative estimation (thro' loop statements) of, say, linear regression model. For this purpose, I have written the following programme and that I have made use of a sample data (viz., exp.txt):
?
Programme:
?
# Linear regression modelling with sample data (try5.txt)
# Repeated estimation through loop statement
2010 Nov 17
1
Problem downloading and opening netcdf file
I am trying to download and open an on-line netcdf file.
I'm using Windows XP and R 2.11.1
Here's my script
library(ncdf)
link <-
"http://ibis.grdl.noaa.gov/SAT/SeaLevelRise/slr/slr_sla_gbl_free_all_66.nc"
dest <- "C:/temp/slr_sla_gbl_free_all_66.nc"
download.file(url=link,destfile=dest)
nc1 <- open.ncdf(dest)
The file appears in my C:/temp
2007 Apr 30
3
syslinux booting from a third partion of ipod.
Hello,
I hope that somebody can help me, I am trying to boot Knoppix from the third
parition of an ipod nano with out loosing the player capabilities. After
fdisk I have the following partitions:
slr ~ # fdisk -l /dev/sda
Disk /dev/sda: 4095 MB, 4095737344 bytes
255 heads, 63 sectors/track, 497 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End
2009 Feb 10
1
error using R Commander for text file import
I am getting the following error on iMac running Mac OS 10.5.6; this occurs whenever I try to import a text file into R Commander:
Error in splitCmd(command) : unbalanced quotes
Thus, I am unable to import data into R Commander. Any suggestions as to how I might fix this error? I have gotten it many times with more than one installation of R 2.8.1 on this computer.
Dwight Krehbiel
Bethel