similar to: A Few Questions

Displaying 20 results from an estimated 1000 matches similar to: "A Few Questions"

2002 Oct 14
3
normalizing data sets
Hi, Can someone tell me how to normalize a data set so that the mean of the set is 0 and the variance is 1. As I understand, when you calculate the principle components of a data set through correlation as < princomp( dataset, cor=T ) > then a similar calculation is performed. I would like to know how I can perform such a calulation directly. Any help would be greatly appreciated. Many
2002 Apr 16
6
Classification Analysis
Hi everyone, Could somebody explain to me what is the package/function for classification analysis. I am performing analysis of music files in the form of MIDI files. I end up with about 750 dependent variables from the analysis, I also have a number of independent/grouping variables that I set manually. What I would like is to be able to predict which group a particular MIDI files belongs to
2003 May 27
3
0 margin for creating eps files
Dear all, I am trying to create eps files of R plots (in Linux) so that I can import them into Word (obviously in MS Windows). What I would like is for the files to be cropped so that there is no margin around the actual plot, because I have no way of editing the files after they have been created. I have tried using par(mai=c(.75,.75,0,0)) in order to reduce the margin; it works fine when I
2002 Jul 03
2
grouping in scatterplot3d
Hi all, I've been using the scatterplot3d function (from the scatterplot3d library) to create 3D plots. I was wondering whether there is anyway to group the points according to a particular group variable. For example I used the plot function as plot( factor( <GROUPINGVAR> ) , <PLOTVARS> ) to organise the results in a according to the grouping variable. I was wondering
2002 Oct 17
1
panel vs subpanel in cloud from lattice library
Hi, Could somebody explain to be the different between the panel and the subpanel parameter in the cloud function of the lattice library. I'm not sure when to use which. Thanks Rishabh -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or
2012 Jul 27
1
A Little Help
Hi Rishabh, I think its better not to expose RankiList to Letor.h and make it better user friendly. So my suggestion is to convert RankList to the following statement in this method. std::map<Xapian::docid, double> letor_score(const Xapian::MSet & mset); So just convert the RankList in std::map<Xapian::docid, double> format in the methods where you need to return. Parth. On
2012 Jul 18
2
Letor: Post Mid-Term plan
Hello Rishabh, As per our previous discussion, we will talk each week now about the project. Please update the timeline/todo/journal accordingly so that we can check the status on this saturday for this week. Please remember that this half of the programme is smaller and hence we would need to be very punctual about the goals. Regards, Parth. -------------- next part -------------- An HTML
2012 Jul 12
2
Mid-term progress
Hi Rishabh, As per our last progress meeting, I am off for some days and as now its the time to mid-term evaluation, it would be better to generate a progress report. For that, you should first commit the code as it is and then write 2 to 3 page summary explaining the deliverables so far and then the future plan. Tomorrow is the last day, so better by tomorrow morning, send this across and by
2003 Apr 10
3
multiple numerical variables in aov
Hi all, I have a question regarding the anova function aov(). I want to perform an anova calculation using one grouping variable but more than one numerical variables: So instead of: aov(v ~ g) I want something like aov(v1 + v2 + v3 ~ g) Essentially I want to find out whether the variables v1, v2, v3, etc can collectively discriminate between different values of variable g. Could
2012 Apr 24
3
Letor re-factored code
Hello Rishabh, The attached diff file should help you to refactor the existing letor code and plug in your code easily. I have defined the header files with the necessary flow. I have also specified the ranker class, which should be implemented by a new LTR models, ListNet and ListMLE in your case. The evaluation file should be used for validating the performance of the algorithm in the training
2012 Jun 05
1
Letor Project
Hi Rishabh, I took some time out in the recent days to work on the refactoring. And now it looks like I have included all the files necessary for the complete code. I am sure if it will be quite easy for you now to start with the new code. I would like you to complete it by implementing (copy/paste/little modification) some of the methods. https://github.com/parthg/xapian To make it easier,
2002 Oct 22
1
extracting variables with patttern templates
Hi all, I was wondering, does R have a facility to extract datasets based on a string template. I know that you can do something like: X["a"] # extract from 'X' the dataset named 'a'. What I would like is something which says, from 'X' extract all the datasets that have an 'a': X[pat = "a"] I know that the 'pat' option can
2003 Mar 14
2
boxplots with multiple numerical variables
Hi all, I have a question regarding the boxplot function. The data I am working on has 1 grouping variable (G) and it has many numerical variables (V1, V2, V3, V4, Vx, etc). What I would like to do is create a boxplot where the Y-axis represents the numerical values of variable V1...Vx (all the variables have the same range). The X-axis needs to represent the G-V combination. So suppose the
2012 Apr 01
1
[GSoC2012] Learning to Rank: few thoughts/issues
Hello, I would like to work with Orange as part of GSoC 2012(and continue henceforth). Apologies for joining in a bit late- i was waiting to get a proper grasp of things before discussing it here. Currently I am a Masters students in Mathematics with my bachelors in Computer Science[integrated dual degree]. Over the last year and a half, I have worked on a few ML projects and have a couple of
2002 Jul 03
2
lda from MASS function
Hi all, I am using the lda function from the MASS library to measure the discriminance of different variables with respect to different grouping variables by using lda( RESULTVARS[, 1:750] , GROUPVAR , tol=0 ) where RESULTVARS contains some 750 different variables. Occasionally there is a variable within RESULTVARS that has the same values for all values of GROUPVAR, ie no variance so
2002 Mar 17
1
Discriminant Analysis Using Anova in R
Hi All, I am currently trying to use R to perform some statistical discriminant analysis on a data set using ANOVA. I'm new to anova and R as well. As I understand it, ANOVA can be used to perform discriminant analysis by measuring the value of the f-test when given a data set with a grouping variable and the dependent variable. What I would like to do in R is perform ANOVA and extract the
2002 May 30
1
ignoring some constants
Hi all, I'm trying to use the lda function from the MASS library to perform a discrimant analysis. The problem is that some of the variables within the data set are constant with relative to grouping variables and the function gives an error. So when I use the function as: > lda(d[11:14], d$set) where d is the data object, [11:21] is the range of the variables to be analysed,
2012 Apr 04
0
Doubt regarding Feature selection for 'Learning to Rank' algorithms
Hi Rishabh, I had this feeling before. This is a really nice idea BUT we can not go ahead with the project which is still not tested in the experimental settings. Though it may be a wonderful research exercise, I would still vote to go for the state-of-the-art methods which are completely published with full details and experimental results. Hope you get my point. Regards, Parth. On Wed, Apr 4,
2013 Mar 21
1
GSOC - 2013 - Introduction (Learning to Rank)
Hello Everyone, I am looking forward to contribute to Xapian and also apply as a Google Summer of Code student. I would like to start by introducing myself. I am a final year M.Sc.(H) Chemistry and B.E. (H) Electronics and Instrumentation student at BITS - Pilani, Goa. I am interested in Machine Learning and presently pursuing my thesis on the same. I have been selected for Google Summer of Code
2002 Jul 09
4
changing angle in scatterplot3d
Hi all, I was wondering whether it is possible to change the angle of all axis in a scatterplot3d graph. I know that there is one parameter <angle> but I was wondering whether it is possible to control the angle of all different axis individually (eg by using <anglex><angley><anglez>). In addition I was wondering whether there is a way to change the angle of a plot