Displaying 20 results from an estimated 4000 matches similar to: "Logistic regression model + precision/recall"
2006 Nov 21
1
Logistic regression model (Urjent help needed)
I am using logistic regression model (lrm) of package Design.
Can some one please tell me how to calculate the average Area Under Curve
(AUC) for n-fold cross-validation
The help for lrm function says to do cross validation like this
f <- lrm( cy ~ x1 + x2, x=TRUE, y=TRUE)
val <- validate.lrm(f, method="cross", B=5)
Now I dont know what to do with variable "val" to
2007 Jan 21
1
logistic regression model + Cross-Validation
Hi,
I am trying to cross-validate a logistic regression model.
I am using logistic regression model (lrm) of package Design.
f <- lrm( cy ~ x1 + x2, x=TRUE, y=TRUE)
val <- validate.lrm(f, method="cross", B=5)
My class cy has values 0 and 1.
"val" variable will give me indicators like slope and AUC. But, I also need
the vector of predicted values of class variable
2006 Nov 14
1
Using lrm
Hi,
I have to build a logistic regression model on a data set that I have. I
have three input variables (x1, x2, x3) and one output variable (y).
The syntax of lrm function looks like this
lrm(formula, data, subset, na.action=na.delete, method="lrm.fit",
model=FALSE, x=FALSE, y=FALSE, linear.predictors=TRUE, se.fit=FALSE,
penalty=0, penalty.matrix, tol=1e-7,
2008 Jan 05
1
AUC values from LRM and ROCR
Dear List,
I am trying to assess the prediction accuracy of an ordinal model fit with
LRM in the Design package. I used predict.lrm to predict on an independent
dataset and am now attempting to assess the accuracy of these predictions.
>From what I have read, the AUC is good for this because it is threshold
independent. I obtained the AUC for the fit model output from the c score (c
=
2009 Jul 17
2
Getting the C-index for a dataset that was not used to generate the logistic model
Does anyone know how to get the C-index from a logistic model - not using
the dataset that was used to train the model, but instead using a fresh
dataset on the same model?
I have a dataset of 400 points that I've split into two halves, one for
training the logistic model, and the other for evaluating it. The structure
is as follows:
column headers are "got a loan" (dichotomous),
2010 Dec 09
1
error in lrm( )
Dear Sir or Madam?
I am a doctor of urology,and I am engaged in developing a nomogram of bladder cancer. May I ask for your help on below issue?
I set up a dataset which include 317 cases. I got the Binary Logistic Regression model by SPSS.And then I try to reconstruct the model
?lrm(RECU~Complication+T.Num+T.Grade+Year+TS)? by R-Project,and try to internal validate the model through
2010 Feb 12
1
validate (rms package) using step instead of fastbw
Dear All,
For logistic regression models: is it possible to use validate (rms
package) to compute bias-corrected AUC, but have variable selection
with AIC use step (or stepAIC, from MASS), instead of fastbw?
More details:
I've been using the validate function (in the rms package, by Frank
Harrell) to obtain, among other things, bootstrap bias-corrected
estimates of the AUC, when variable
2008 Sep 08
2
ROC curve from logistic regression
I know how to compute the ROC curve and the empirical AUC from the logistic
regression after fitting the model.
But here is my question, how can I compute the standard error for the AUC
estimator resulting form logistic regression? The variance should be more
complicated than AUC based on known test results. Does anybody know a
reference on this problem?
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2012 Sep 20
1
validate.lrm - confidence interval for boostrap-corrected AUC ?
Hi
Does anyone know whether the rms package provides a confidence interval for
the bootstrap-corrected Dxy or c-index?
I have fitted a logistic model, and would like to obtain the 95% confidence
interval of the bootstrap-corrected area under the ROC curve estimate.
Thanks.
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2010 Sep 20
5
predict.lrm ( Design package)
Dear List,
I am familier with binary models, however i am now trying to get predictions from a ordinal model and have a question.
I have a data set made up of 12 categorical predictors, the response variable is classed as 1,2,3,4,5,6, this relates to threat level of the species ( on the IUCN rating).
Previously i have combined levels 1 and 2 to form = non threatened and then combined 3-6 to
2009 Jul 17
1
c-index validation from Design library
Hi Group,
I have a question about obtaining the bias-corrected c-index using
validate from the Design library.
As an example, consider the example from help page:
library(Design)
?validate.lrm
n <- 1000
age <- rnorm(n, 50, 10)
blood.pressure <- rnorm(n, 120, 15)
cholesterol <- rnorm(n, 200, 25)
sex <- factor(sample(c('female','male'),
2010 Dec 05
1
HOW to use the survivalROC to get optimal cut-off values?
I have the same problem of a prevous request
HOW to use the survivalROC (or another library in R) to get optimal
cut-off values?
I want to use the time-dependent survivalROC package.according to
the,reference material,it only gives a set of ordered cut-off values
.eg.
--------------------------------------------------------------------------------
data(mayo)
str(mayo)
attach(mayo)
2010 Dec 05
1
HOW to use str() after the survivalROC (or another library in R) to get optimal cut-off values
I have the same problem of a previous request
HOW to use the survivalROC (or another library in R) to get optimal
cut-off values?
I want to use the time-dependent survivalROC package.according to
the,reference
material,it only gives a partial set of ordered cut-off values .eg.
--------------------------------------------------------------------------------
data(mayo)
str(mayo)
attach(mayo)
2008 Mar 11
2
xen configuration variables
Hi
Is there any link from where i can get complete information about the
variables used in xen domu configuration in details
like hvm, pae, acpi, apic, device_model etc and when to use which variable
thansk
_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users
2008 Feb 25
4
cpu does not support long mode. use 32 bit distribution.
hi all
i am trying to boot from rhel5.1 x86_64 image. with the following
configuration
kernel = "/usr/lib/xen/boot/hvmloader"
builder=''hvm''
memory = 3048
name = "rhel51"
vcpus=1
cpus = ""
vif = [ ''type=ioemu, bridge=xenbr0'' ]
disk = [ ''phy:/dev/cciss/c0d0p7,ioemu:hda,w'',
2007 Jul 26
5
ROC curve in R
Hi,
I need to build ROC curve in R, can you please provide data steps / code
or guide me through it.
Thanks and Regards
Rithesh M Mohan
[[alternative HTML version deleted]]
2017 Jun 13
7
[Bug 2729] New: Can connect with MAC hmac-sha1 even though it's not configured on the server
https://bugzilla.mindrot.org/show_bug.cgi?id=2729
Bug ID: 2729
Summary: Can connect with MAC hmac-sha1 even though it's not
configured on the server
Product: Portable OpenSSH
Version: 7.5p1
Hardware: All
OS: Linux
Status: NEW
Severity: security
Priority: P5
2009 Oct 22
5
How to calculate the area under the curve
Hi all,
I would like to calculate the area under the ROC curve for my predictive
model. I have managed to plot points giving me the ROC curve. However, I do
not know how to get the value of the area under.
Does anybody know of a function that would give the result I want using an
array of specificity and an array of sensitivity as input?
Thanks,
Olivier
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2007 Feb 01
16
Help with RadRails...
Hi everyone,
I hope someone can help with some RadRails guidance...
( on WIndows XP )
I''ve been using UltraEdit and it''s Project management is good, but I
feel RadRails should be better with the inbuild Ruby and RoR
features...
I''ve tried working through the tutorials on the web site for example
the CookBook tutorial & it tells me to go the Generators Pane, which
2002 Jan 23
6
meaning of "IO Error: skipping the delete...."
On 23 Jan 2002, Nitin Agarwal <nitin.agarwal@timesgroup.com> wrote:
> Hi,
> I am Nitin from India working with a leading Indian newspaper "The Times
>
> of India".
> We recently downloaded "rsync" and found it to be very useful and good
> utility.
> We tried to implement it between our main server and the DRS (Disaster
> Recovery System), located