Java is an object-oriented language and runtime environment (JRE). Java programs are compiled to bytecode and run in a virtual machine (JVM).

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18 views

Collective randomness of data generated using different seeds

We are generating 5 random numbers for every object we process - this is Java, but the code is pretty easy to follow (docs): ...
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13 views

Unexpected results from Reservoir Sampling Implementation, the probabilities seem to be uneven. Is the implementation correct?

I tried to implement Reservoir Sampling, but the tests indicate that the sampling is not random. ...
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5 views

Using googleVis api in java [migrated]

I have used googleVis api in R for dynamic map.Now i am trying to make a small webapp in which servlet access this api and the result is displayed in jsp.But i am not able to access googleVis api from ...
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1answer
211 views

Weka java API: Attribute Selection and Cross Validation

Is there a way to perform Attirbute selection(aka feature selection) (regardless of method) only for the training dataset before passing data for Cross Validation ? I currently think that the only ...
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1answer
33 views

Statistical Commute Analysis in Java

I have a rather large commute every day - it ranges between about an hour and about an hour and half of driving. I have been tracking my driving times, and want to continue to do so. I am capturing ...
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0answers
41 views

Graphing the usage of legal precedents

I would like to hear recommendations on what tools to use to graph the usage of precedents in a legal court in Brazil. The data is searchable at www.stj.jus.br/SCON/, and in the most recent collegiate ...
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42 views

Point Biserial correlation coefficient in Java

I've recently installed Apache Commons Math library to help me with some basic statistics in my project. Basically, what I need is to calculate the correlation coefficient for 2 arrays, which I can ...
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0answers
57 views

generate frequency distribution from database

In a MySQL database there's a table with a single numeric value column. I want to plot the distribution of these values as a bar chart/histogram with the following ...
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0answers
116 views

J48 Handling Missing Value with Tree based Imputation

Aloha, currently i have some trouble and question zu implement some kind of special missing value handling in WEKA J48 algorithm using WEKA JAVA API. I want to test the performance of SHAPIRO ...
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3answers
614 views

Complete machine learning library for Java/Scala

Python is plenty of ML libraries (like the great scikit-learn). Is there any good for java/scala, containing many algos (regression, classification, clustering, cross-validation, feature processing), ...
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1answer
164 views

Predictive Modeler: How can learning Python and/or Java benefit me?

On a daily basis, I build predictive models (namely, logistic regression and credit scorecard models) using fairly large datasets (typically ~500k records and ~1k candidate variables) to predict ...
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142 views

Simulating unfair die with java/R (programming done)

Task : Unfair die(6 sides) is being rolled n times. Probability of 1 is p1, probability of 2 is p2 and so on. Write a computer program, that for given n (n<100), the probability of set ...
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17 views

Determining number of clusters with maximum jump or minimum variance

I want to determine a number of clusters, but I don't know how to do it. I want to use kmeans and select a number of cluster with minimum variance or with a maximum jump in variance. I plot variance; ...
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42 views

Converting data from classical scaling in MDS

I implemented the classical scaling and obtained the relative coordinates in Java. I want to translate these relative positions, but I am not getting how I should be doing this. This is just like: ...
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2answers
349 views

Latent Dirichlet Allocation as input for WEKA

I am using the Weka API for my research about document classification. I wish to apply Latent Dirichelet Allocation on my dataset followed by using a classifier in Weka. However, it is not so clear to ...
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39 views

Finding repeating patterns in sensor data using Java

I'm working with a dataset that has accelerometer (tri axis) readings, magnetometer (also tri axis) readings, readings for colour etc. All the values are numerical. This data was collected by wearable ...
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15 views

How to use gain and splitinfo for continuous attributes? [duplicate]

I am implementing a C4.5 algorithm, and for that I need to perform attribute selection. How do I use the gain and split info equation to find the best attribute?
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1answer
26 views

Converting FuzzykMeans to SphericalFuzzyKMeans?

I grabbed an implementation of FuzzyKMeans (FuzzyCMeans) from the nightly build of the Apache Commons Math library, but I now realize I need to use Cosine Similarity instead of the Euclidean Distance. ...
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34 views

Classifier jars for java

I have a train file which has categorical features like IN JJ PRP_VBP VB NN PRP$ . . . The third column is the ground truth and can have value only out of ...
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1answer
145 views

how to add instances data into test arff file with the same attribute and relation with training file [closed]

I have training arff file, and also I have instances data at hand. Now I want to add the instances data onto another file, called test file, and this test file has the same relation header and ...
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1answer
276 views

Compute p-value of single value in arbitrary distribution (using java and apache.commons.math3)

I want to compute the p-value of a single numeric value drawn from an arbirtary distribution. The p-value should be comparable to p-values that have been computed with single distinict values drawn ...
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1answer
167 views

Detecting An Image is Bright or Dark? [closed]

I use Java and I have some PNG images. I want to put a caption on my images. However I want that: if an image is bright I want to put a black text on image and if an image is dark I want to put a ...
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0answers
40 views

range normalized with unclear highest value

I tried to normalize many set, which each set consists of 12 values. I want to normalize it into range between 1 and -1. However, the highest value is unclear because the value can be trillion, or ...
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1answer
448 views

Is WEKA's logistic regression tool slow? If yes, are there faster alternatives?

I have to run logistic regression several thousand times, within a Java/Scala program. A general spec for one of the problems is: ~300 continuous attributes ~<10000 positives, and randomly pick ...
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1answer
92 views

Implementation of online classification algorithms?

I'm looking for implementations of online learners. I guess that is possible with AdaBoost. Where you train the model and then you modify it by adding later more training data. However you don't have ...
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30 views

Calculations using data captured over time seems to need a more advanced analysis method

I got a couple comments on my question. First of all, thank you very much. I was asked to be more clear. So, here's an attempt at that. I'm capturing raw data of play performance for each player ...
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1answer
246 views

Obtaining R pec survival patient risk percentage

Introduction I have a 300,000-row cancer dataset with around 60 variables (cancer stage, year of diagnosis, radiation therapy, histology, etc.) with a time variable ("number of months survived") and ...
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39 views

Application “tuning” based on statistics: Lowest-Learning-Curve API for Java programmer?

I want to write an application, where users will have to choose between different "configurations", and I am looking for a way to statistically validate the "balance" of those "configurations", to ...
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1answer
192 views

Test the convergence of a neural network

I'm using Weka multilayer-perceptron classifier to do classifications. I want to know after exactly how many epochs the neural network converges(weights don't update any more). I'm using its java API, ...
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1answer
63 views

Finding the most relevant factors that lead to an event

I have been tasked with looking at a set of data with about 6000 records that each have 60 or so qualities associated with them (Let these be X1, X2, ... ) and determining what are the top 8 factors ...
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1answer
752 views

Percentile to Z-score in PHP or JAVA

I am searching for a way to calculate the $z$-score for a given percentile $p$. I found this site doing such a calculation. They have given a formula for calculating $P(Z\leq z)$: $$ \Phi(z) = P(Z ...
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1answer
447 views

Verifying the output of implementing internal clustering validity indexes

I have implemented some internal clustering validity indexes in Java: Simplified Silhouette. Calinski-Harabasz (VRC). Davies -Bouldin. Dunn's Index. How could I verify if my implementation is ...
2
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0answers
508 views

Outlier detection in time series data

I checked different questions on similar topics, but none were exactly the answer I wanted and I am confused. I am working with big data, the data has a bursty nature with high frequency. I ...
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77 views

Using R in Java Project

I hope this question is not off topic on CV: I am currently fitting some different models (naive bayes, logistic regression...) in R which I up to now thought of as prototypes for a later Java ...
2
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1answer
558 views

Multi-armed bandit algorithms in Java?

Multi-armed_bandit problem defenition from Wikipeda: "In probability theory, the multi-armed bandit problem (sometimes called the K-[1] or N-armed bandit problem) is the problem a gambler faces at a ...
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2answers
231 views

Looking for a test for shape comparison

I have two different time serie both length = 100 and I need to know what is the best test (non-parametric, if possible), that return how much these two series are same or similar shapes. Here are ...
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310 views

Compare shapes with Kolmogorov-Smirnov test

I have two time series, both 100 points length: I would like to perform the goodness of fit to know if these two series have same or similar shape or if they differs significantly. I have read about ...
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1answer
706 views

p-value for hypothesis test with given correlation, sample size

I'm writing a statistical tool in Java. Here I'm calculation pearson correlation values (r). My next step is to validate if my correlation values are good enough to prove that my to variables are ...
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2answers
1k views

Why am I getting different intercept values in R and Java for simple linear regression?

I have linear regression code written in R and I have to do the same thing in Java. I used Apache Commons math library for this. I used the same data in R code and in Java code, but I got different ...
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1answer
458 views

Calculating the probability of a sum of Poisson-distributed random variables

In Java, I have a set of users, each of which has a Poisson-distributed demand with a known mean: ...
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164 views

Sheather-Jones bandwidth algorithm implementation in java?

The Sheather-Jones method for selecting an appropriate bandwidth for kernel density estimation generally produces better results than simpler methods such as Silverman's rule of thumb and Scott's ...
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241 views

How do I get the p-value when using Java's OLSMultipleLinearRegression?

I'm doing my regression using Apache's OLSMultipleLinearRegression class. How do I get the p-value? Is there another name for p-value that I should be looking for in the docs? EDIT: I have the ...
5
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1answer
614 views

Is Xorshift RNG good enough for Monte Carlo approaches? If not what alternatives are there?

I recently stumbled across an article on pseudorandom numbers in Java which mention potential weaknesses in the default algorithm, called linear congruential generator (LCG), and gives some ...
2
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2answers
1k views

Good clustering Java library

I'm looking for a good Java library implementing several clustering algorithms. I'll have to cluster some programs execution traces and I still don't know which algorithms I am going to need, so I'd ...
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5answers
6k views

Open source Java library for statistics at the level offered by a graduate statistics course

I am taking a graduate course in Applied Statistics that uses the following textbook (to give you a feel for the level of the material being covered): Statistical Concepts and Methods, by G. K. ...
2
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1answer
517 views

Different size of vocabulary made by Weka and R's tm

I own around 40,000 text files for preprocessing (in purpose of document classification). I used R (with tm package) for prototype and now looking for a equivalent Java library for products. ...
3
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1answer
303 views

Eigenvalues nearly all 1 in canonical correlation analysis

I ran a Canonical Correlation Analysis on about 845 cases with 1000 variables each. (It originally started with 1000 cases and 400 variables but by using a kernel I got a 1000x1000 matrix) As a ...
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2answers
678 views

Java code for thin SVD

I am looking for a library/package/code to do thin SVD in Java. I found a good implementation of SVD in the COLT package for java, but that's not sufficiently robust with large sparse matrices when ...
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1k views

Implementation of Gaussian process

i try to implement a simple gaussian process regression in java. I almost got every step from the book http://www.GaussianProcess.org/gpml . With my implementation of algorithm 2.1 on page 19 i'm ...
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3answers
2k views

Data mining classification competition

I'm currently taking a data mining class, and for one our projects we're required to predict the class label for an unknown data set by first building a classifier on a training data set which already ...