Displaying 20 results from an estimated 10000 matches similar to: "Discriminant analyse"
2010 Nov 16
3
discriminant function analysis
My objective is to look at differences in two species of fish from morphometric measurements. My morphometric measurements are head length, eye diameter, snout length, and measurements from tail to each fin. I want to use discrimanant function analyis to determine if there are differences between the two species.
I am familiar with R but new to discrimannt function analysis. I want to learn
2005 Sep 29
1
Fisher's discriminant functions
Hi everyone,
I'm trying to solve a problem about how to get the
Fisher's discriminant functions of a "lda" (linear
discriminant analysis) object, I mean, the object
obtained from doing "lda(formula, data)" function of
the package MASS in R-project. This object gives me
the canonical linear functions (n-1 coefficients
matrix of n groups at least), and only with this
2004 Jul 23
1
discriminant analysis
Hello.
I have a data base with 50 qualitative variables and a lot of
individuals. I try to estimate the links between one of these variables
(landcover) and the 49 others (geomorphology, hydrography...). I want to
use a "discriminant analysis on qualitative variables" (as DISQUAL in
SPAD) or a " log-linear model ". Which R-Package(s) or other methods can
you advise me.
2005 Jul 05
4
Discriminant Function Analysis
Dear All
This is more of a statistics question than a question about help for R,
so forgive me.
I am using lda from the MASS package to perform linear discriminant
function analysis. I have 14 cases belonging to two groups and have
measured each of 37 variables. I want to find those variables that best
discriminate between the two groups, and I want to visualise that and
create a
2005 Aug 05
1
lda discriminant functions
Hi list,
I'm looking about lda function.
I'd like to know how calcolate the value of the discriminant functions for the
original datas.
I see that in the result object "lda" there is $scaling a matrix which
transforms observations to discriminant functions, normalized so that within
groups covariance matrix is spherical.
I'd like to have the value of the discriminant
2003 Aug 26
2
discriminant function
How can I extract the linear discriminant functions resulting from a LDA
analysis?
The coefficients are listed as a result from the analysis but I have not
found a way to extract these programmatically. No refrences in the
archives were found.
Thank you very much,
Stefan
2009 Feb 25
2
Linear Discriminant Analysis
Kindly let me know the process to carry out a Linear discriminant
analysis...thanks in advance
Arup
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2007 Aug 23
4
Calculating diameters of cirkels in a picture.
Hi,
Maybe this is more a programming questions than a specific R-project question, but maybe there is someone who can point me in the right direction.
I have a picture of cirkels which I took with a digital camera.
Now I want to use the diameter of the cirkels on the picture for analysis in R.
I can use pixmap to import the picture, but how do I find the outside cirkels and calculate the
2010 Dec 14
4
Discriminant Correspondence Analysis
Hello everyone,
I am totally new to the R program. I have had a look at some pdf documents
that I downloaded and that explain how to do many things in R; however, I
still cannot figure out how to do what I want to do, which is to perform
Discriminant Correspondence Analysis on a rectangular matrix of data that I
have in an Excel file. I know R users frown upon Excel and recommend
converting Excel
2005 Aug 05
2
Discriminant analysis
Hi,
I'm a newbie in R and don't much aobut all the
modules and their capabilities, but I'm interested in
solving a problem about a discriminant analysis done
with SPSS tool. The thing is that I would like to make
a discrimant analysis similar to the one done with
SPSS, but I can't find the way to solve it.
I've been playing with R and I can handle more or
less my data,
2007 Feb 05
1
manova discriminant functions?
Hello,
I've been playing with the manova() function to do some pretty
straightforward multivariate analyses, and I can't for the life of me figure
out how to get at the discriminant functions used. When predicting several
variables simultaneously, it's important to be able to gauge how much each
variable is contributing to the analysis...a simple p-value isn't really
enough. I
2010 Jun 05
1
Prediction in discriminant analysis
Sir,
I am working with multiclass discriminant analysis.(say response variable
has 3classes).In R, using lda(), I get 2 sets of coefficients for the
discriminant function.Now, I want to put a new x-vector(vector of
independent variables) and want to check it corresponds to which class of
y.Is there any formula for doing this? or how can I do this?
Regards,
Suman Dhara
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2012 Nov 16
1
discrete discriminant analysis
Hello,
I am using the mda package and in particular the fda routine to classify in
term of gear a set of 20 trips.
I preformed a flexible discriminant analysis (FDA) using a set of 151
trips.
FDAT1 <- fda(as.factor(gear) ~ . , data =matrizR)
A total of 22 predictors were considered. 20 of the predictors are
"numeric" and 2 are "factors/discrete".
The resulting FDA
2009 Oct 15
1
Discriminant plot
Hi Alejo,
According to my knowledge the two plots are different because in the
first one a point belongs to a group depending on its group in the data
whereas in the second plot a point belongs to the group predicted by the
linear discriminant analysis.
I hope somebody will correct me if I am wrong.
Alain
Alejo C.S. wrote:
> Hi Alain, this is the code:
>
>
> library(MASS)
>
1999 Aug 19
3
Discriminant analysis with R
Hello,
I might have missed it in the help pages, but I cannot find if something
exits in a package to make discriminant analysis.
Any help, or hint about where to look for it, is welcome,
Laurent
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2013 Apr 07
1
discriminant function analysis
I have the Rexcel package. Which of the functions do I want to run a
discriminant function analysis? Or, how would I do it in R?
Thanks.
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2004 Nov 29
1
Kernel Fisher Discriminant in R?
Dear members,
I am wondering if there are any functions to perform the Kernel Fisher
Discriminant method, especially for multi-class problems, in R. I would
appreciate any kind of information on this.
Thanks for your time.
Seungho Huh, Ph.D.
Research Statistician
RTI International
North Carolina, USA
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2012 Oct 21
1
Linear discriminant function analysis based median as group centroid and nonparametric scale estimators???
Dear All,
I am using a specific approach for my master thesis. In essence, a
supervised reclassification is used as an intermediate step to find chemical
parameters which are able to reclassify defined groups. These variables will
be used in a next step where location and scale estimators of the groups are
important. Traditionally linear discriminant analysis is used for
reclassification which
2004 Jan 20
1
evaluation of discriminant functions+multivariate homoscedasticity
Hello,
I am switching from SPSS-Windows to R-Linux. My university is very
SPSS-oriented so maybe that's the cause of my problems. I am a beginner
in R and my assignments are SPSS-oriented, so I hope I don't annoy
anyone with my questions...
Right now I've got 2 problems:
-I have to evaluate discriminant functions I have calculated with
lda(MASS). I can't find a measure that
2006 Nov 16
3
X-fold cross validation function for discriminant analysis
Hi all,
I ran a discriminant analysis with some data and want to get a general idea
of prediction error rate. Some have suggested using X-fold cross validation
procedure. Anyone know if there is a function for this in R?
Thanks,
Wade
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