Questions tagged [weka]
WEKA is a GUI based data mining suite written in Java, developed at the University of Waikato
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How to create more dimensions for data mining?
I want to analyze product sales data with WEKA. My data have attributes: sell quantity and sales price. I want to add more attributes, such as mean and standard deviation.
What formula I should use ...
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is there any way to plot ROC curves from weka
i am using some algorithms from weka . i was willing to plot some algorithms' roc curve for comparison . Is it possible and how ?
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Simple Weka classification example in Java gives inconsistent answers
I have the following simple weka code to use a simple decision tree, train it, and then make predictions.
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How to reload all attributes in WEKA
Is there a way to reload all attributes after having removed someones without reopening the data file ?
Any help please ?
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Which feature selection I should trust?
I use Python and Weka to run feature selection on my dataset (91 predictor variables). I can see a huge difference (feature ranking) from different algorithms. And these results are still quite ...
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How to use a predfined separate prune set in Weka (alternatives in R or Python also acceptable)
I recently ran into a problem that seems to have considerate local effects, in space and time in fact: Two objects that are close are likely yo be in a similar state (if they are in the same year). I'...
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What does the “numDecimalPlaces” in J48 classifier do in WEKA?
Can anyone explain the purpose of "numDecimalPlaces" parameter in J48 WEKA classifier ? Its default value is 2 and its description is given as follows:
The number of decimal places to be used for ...
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Weka Decision Tree not working on real data
I'm trying to make human activity recognition using the iOS accelerometer and gyroscope. The feature that I use are mean, variance, standard deviation, energy and cross-domain entropy. If I provide ...
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Weka alternative - visual data exploration with a very large dataset
I love Weka for its visual data exploration features (it's great at quickly giving you a mile-high aerial view of the distributions of all your variables).
I have a 0.5gb dataset, and Weka is unable ...
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How to create visualisation on medical data?
I want to create a data visualization on medical data i.e. patient's medical history, allergies one is having, any chronic patient's name must be highlighted, etc. And, there can be a separate ...
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Numerical data and different algorithms
I was hoping to get some help on a task I have been given. I have a data set with the chemical breakdown of a drink. My job is to find some sort of analysis with the given data. The data has 10 ...
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Making fake result in data mining using weka j48 algorithm
I have 130 records in one CSV dataset and I'm using j48 decision tree. I used the whole training set for testing, and the result was 79 correctly classified and 51 incorrectly classified records.
Now! ...
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ZeroR Classifier
I've got a program that analyses some data based on a bunch of values then spits out a true/false value if it was correct or not. I'm using the Weka software to graph this all up and I just want to ...
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Sentiment Analysis algorithm in Weka
I have an assignment, i have to collect movie reviews and classify them with poz neg notr tags, and turn them info arff files. I did all of this stuff with regex etc.
But for experiment i have to ...
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Method of finding threshold in Decision tree for continuous data
I am using decision tree in Weka and I have some continuous data, so when I use Weka it automatically find the threshold for me but for some reason I want to implement Decision Tree by myself so I ...
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Attribute discretization
I have a dataset where I need to explore using unsupervised technics (clustering and association rules). What are the best strategies to discretize the numeric attributes? Also, does this (attribute ...
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Various algorithms performance in a problem and what can be deduced about data and problem?
HI I am currently trying to apply various algorithms to a classification problem to assess which could be better and then try to fine tune the bests of the first approach. I am a beginner so I use ...
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In Weka, how to draw learning curve evaluated on both test and training set?
This is just for finding overfitting gap.
After initial research, I can only find method to draw learning curve using evaluation of test set. However, I could not evaluate on training set and over ...
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