Questions tagged [r]

R is a free, open-source programming language and software environment for statistical computing, bioinformatics, and graphics.

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3
votes
2answers
681 views

How to run R programs on multicore using doParallel package?

I am running SVM algorithm in R.It is taking long time to run the algorithm.I have system with 32GB RAM.How can I use that whole RAM memory to speed my process.
3
votes
3answers
4k views

Visualizing Support Vector Machines (SVM) with Multiple Explanatory Variables

I was wondering if anyone was aware of any methods for visualizing an SVM model where there are more than three continuous explanatory variables. In my particular situation, my response variable is ...
2
votes
3answers
844 views

Choosing the right data mining method to find the effect of each parameter over the target

I am dealing with a lot of categorical data right now and I would like to use an appropriate data mining method in any tool [preferably R] to find the effect of each parameter [categorical parameters] ...
2
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1answer
333 views

survey data analysis (discrete data)

I did small survey and get such data: ...
2
votes
1answer
378 views

Which packages or functions can I use in R to plot 3D data like this?

There're many data points, each of which is associated with two coordinates and a numeral value, or three coordinates. And I wish it is coloured. I checked packages "scatterplot3d" and "plot3D" but I ...
4
votes
9answers
2k views

Python and R good tutorials? [closed]

I would like to learn both Python and R for usage in data science projects. I am currently unemployed, fresh out of university, scouting around for jobs and thought it would be good if I get some ...
3
votes
1answer
4k views

R Script to generate random dataset in 2d space

I want to analyze the effectiveness and efficiency of kernel methods for which I would require 3 different data-set in 2 dimensional space for each of the following cases: BAD_kmeans: The data set ...
2
votes
3answers
324 views

Differences in scoring from PMML model on different platforms

I've built a toy Random Forest model in R (using the German Credit dataset from the caret ...
2
votes
1answer
65 views

Adaptive regression parameter estimation in R

How would I do parameter estimation and prediction for the adaptive regression model using R, as in the 4th page of the paper linked below? http://papers.ssrn.com/sol3/papers.cfm?abstract_id=923635 ...
3
votes
0answers
38 views

What are the parameter estimation methods for the two methods in this paper?

Automated Time Series Forecasting for Biosurveillance in the above paper, page 4, two models, non-adaptive regression model, adaptive regression model, the non-adaptive regression model's parameter ...
27
votes
10answers
22k views

Any Online R console?

I am looking for an online console for the language R. Like I write the code and the server should execute and provide me with the output. Similar to the website Datacamp.
6
votes
2answers
4k views

Kappa near to 60% in unbalanced (1:10) data set

As mentioned before, I have a classification problem and unbalanced data set. The majority class contains 88% of all samples. I have trained a Generalized Boosted Regression model using ...
2
votes
1answer
173 views

Creating obligatory combinations of variables for drawing by random forest

Problem For my machine learning task, I create a set of predictors. Predictors come in "bundles" - multi-dimensional measurements (3 or 4 - dimensional in my case). The hole "bundle" makes sense ...
2
votes
0answers
432 views

ANOVA RBF kernel returns very poor results

I was curious about the ANOVA RBF kernel provided by kernlab package available in R. I tested it with a numeric dataSet of 34 input variables and one output variable. For each variable I have 700 ...
7
votes
3answers
1k views

Forecasting Foreign Exchange with Neural Network - Lag in Prediction

I have a question regarding the use of neural network. I am currently working with R (neuralnet package) and I am facing the following issue. My testing and validation set are always late with respect ...
10
votes
1answer
863 views

Libraries for (label propagation algorithms/frequent subgraph mining) for graphs in R

General description of the problem I have a graph where some vertices are labeled with a type with 3 or 4 possible values. For the other vertices, the type is unknown. My goal is to use the graph to ...
-6
votes
2answers
280 views

which programming language has a large library that can do machine learning algorithm, R, matlab or python [closed]

As what I described in the title, we are especially interested in those for dealing with big data----ts efficiency and stability, and used in industry not in experiment or university. Thanks!
-3
votes
2answers
1k views

Which one will be the dominating programming language for next 5 years for analytics , machine learning . R or python or SAS [closed]

Which one will be the dominating programming language for next 5 years for analytics , machine learning . R verses python verses SAS. Advantage and disadvantage.
4
votes
1answer
839 views

Understanding output stepAIC

I am using the stepAIC function in R to do a bi-directional (forward and backward) stepwise regression. I do not understand what each return value from the function ...
2
votes
3answers
3k views

Analysis of Split (A/B) tests using Poisson and/or Binomial Distribution

Cross posting this from Cross Validated: I've seen this question asked before, but I have yet to come across a definitive source answering the specific questions: What's the most appropriate ...
-1
votes
1answer
135 views

R error using Knitr

I am attempting to compile code using Knitr in R. My code below is returning the following error, and causes errors in the rest of the document. ...
3
votes
1answer
223 views

Avoid iterations while calculating average model accuracy

I am fitting a model in R. use createFolds method to create several k folds from the data set loop through the folds, repeating ...
19
votes
6answers
12k views

What do you use to generate a dashboard in R?

I need to generate periodic (daily, monthly) web analytics dashboard reports. They will be static and don't require interaction, so imagine a PDF file as the target output. The reports will mix tables ...
89
votes
1answer
248k views

How to get correlation between two categorical variable and a categorical variable and continuous variable?

I am building a regression model and I need to calculate the below to check for correlations Correlation between 2 Multi level categorical variables Correlation between a Multi level categorical ...
3
votes
1answer
5k views

R aggregate() with dates

I am working on a data set that has multiple traffic speed measurements per day. My data is from the city of chicago, and it is taken every minute for about six months. I wanted to consolidate this ...
8
votes
1answer
7k views

R error using package tm (text-mining)

I am attempting to use the tm package to convert a vector of text strings to a corpus element. My code looks something like this Corpus(d1$Yes) where ...
12
votes
3answers
989 views

Predicting next medical condition from past conditions in claims data

I am currently working with a large set of health insurance claims data that includes some laboratory and pharmacy claims. The most consistent information in the data set, however, is made up of ...
17
votes
2answers
7k views

Recommending movies with additional features using collaborative filtering

I am trying to build a recommendation system using collaborative filtering. I have the usual [user, movie, rating] information. I would like to incorporate an ...
11
votes
3answers
991 views

Data visualization for pattern analysis (language-independent, but R preferred)

I want to plot the bytes from a disk image in order to understand a pattern in them. This is mainly an academic task, since I'm almost sure this pattern was created by a disk testing program, but I'd ...
1
vote
2answers
1k views

Running huge datasets with R

I'm trying to run some analysis with some big datasets (eg 400k rows vs. 400 columns) with R (e.g. using neural networks and recommendation systems). But, it's taking too long to process the data (...
5
votes
3answers
4k views

Stochastic gradient descent in logistic regression

I am very new to machine learning and in my first project have stumbled across a lot of issues which I really want to get through. I'm using logistic regression with R's ...
11
votes
1answer
566 views

Fisher Scoring v/s Coordinate Descent for MLE in R

R base function glm() uses Fishers Scoring for MLE, while the glmnet appears to use the coordinate descent method to solve the ...
7
votes
1answer
1k views

Linear Regression in R Mapreduce(RHadoop)

I m new to RHadoop and also to RMR... I had an requirement to write a Mapreduce Job in R Mapreduce. I have Tried writing but While executing this it gives an Error. Tring to read the file from hdfs ...
7
votes
2answers
943 views

Identifying “clusters” or “groups” in a matrix

I have a matrix that is populated with discrete elements, and I need to cluster them (using R) into intact groups. So, for example, take this matrix: ...
2
votes
1answer
850 views

Difference Between Hadoop Mapreduce(Java) and RHadoop mapreduce

I understand Hadoop MapReduce and its features but I am confused about R MapReduce. One difference I have read is that R utilizes maximum RAM. So do perform parallel processing integrated R with ...
10
votes
4answers
1k views

Learning ordinal regression in R?

I'm working on a project and need resources to get me up to speed. The dataset is around 35000 observations on 30 or so variables. About half the variables are categorical with some having many ...
115
votes
15answers
114k views

Python vs R for machine learning

I'm just starting to develop a machine learning application for academic purposes. I'm currently using R and training myself in it. However, in a lot of places, I have seen people using Python. What ...
-2
votes
1answer
567 views

How can I extract news about a particular company from various websites using RODBC package in R? And perform sentiment analysis on the data? [closed]

I would like to extract news about a company from online news by using the RODBC package in R. I would then like to use the extracted data for sentiment analysis. I want to accomplish this in such a ...
4
votes
1answer
966 views

Open source solver for large mixed integer programming task?

I'm currently using General Algebraic Modeling System (GAMS), and more specifically CPLEX within GAMS, to solve a very large mixed integer programming problem. This allows me to parallelize the ...
10
votes
3answers
1k views

What are R's memory constraints?

In reviewing “Applied Predictive Modeling" a reviewer states: One critique I have of statistical learning (SL) pedagogy is the absence of computation performance considerations in the evaluation ...
35
votes
7answers
4k views

Organized processes to clean data

From my limited dabbling with data science using R, I realized that cleaning bad data is a very important part of preparing data for analysis. Are there any best practices or processes for cleaning ...
5
votes
2answers
620 views

Running an R script programmatically [closed]

I have an R script that generates a report based on the current contents of a database. This database is constantly in flux with records being added/deleted many times each day. How can I ask my ...
51
votes
9answers
7k views

Is the R language suitable for Big Data

R has many libraries which are aimed at Data Analysis (e.g. JAGS, BUGS, ARULES etc..), and is mentioned in popular textbooks such as: J.Krusche, Doing Bayesian Data Analysis; B.Lantz, "Machine ...

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