The unbalanced-classes tag has no wiki summary.
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Problem with classifier after using SMOTE to balance the data
We've ran into a problem while training a classifier on an unbalanced data set.
The response is binary with 0 indicating 'non defaulter' and 1 indicating 'defaulter' (it's a credit scoring task).
...
3
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0answers
51 views
Mixed-effects model for a strongly unbalanced design
I am somehow unsure on the best option to analyze these data.
Here is my study case:
The response variable is a morphometric measure, one for each individual.
During 10 years, say 2000-2009, people ...
3
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0answers
299 views
Classification with GBM in R and imbalanced class sizes
I'm dealing with a supervised binary classification issue. I'd like to use the GBM package to classify individuals as uninfected/infected. I have 15 times more uninfected than infected individuals.
I ...
3
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167 views
Softmax regression bias and prior probabilities for unequal classes
I'm using Softmax regression for a multi-class classification problem. I don't have equal prior probabilities for each of the classes.
I know from Logistic Regression (softmax regression with 2 ...
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0answers
94 views
How to use k nearest neighbours for binary classification with unbalanced classes?
I have relatively large (100k items) dataset which I need to split in two groups. So far I've tried knn and the results are not good mainly because I have disproportion in my training data: 90% of ...
2
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495 views
Using AdaBoost on multi-class in R on unbalanced data
I have a data set which is highly imbalanced and I have used the SMOTE algorithm (using the R package DMwR) to balance the binary class in the data set. I have been using the R Ada package to then ...
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400 views
How to analyze an unbalanced within-subject ANOVA design?
I have data from an experiment involving 4 groups of subjects, 2 possible interventions first and 3 possible intervention at a 2nd point, repeated data measurements from each subjects multiple time ...
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64 views
Type I ANOVA tests not depending on the order of the factors
I have a dataset with two factors A and B and the following design (contigency table showing the number of individuals for each ...
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0answers
56 views
Different Mean Square partitions in an unbalanced bifactorial ANOVA (with random factor) between R and Statistica
I am trying to extract variance components for selection and chance in a bifactorial design with Generation as a fixed factor and Replicate as a random term, for early fecundity.
Since I am using ...
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128 views
How to compare multiple groups of unblanced repeated measures non normal data?
I'm trying to compare three groups data. But the data set is about a new drug trial. The data set has these characteristics:
Follow-up set. That is, after administration of the drug, a
series of ...
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35 views
How to create the class range given 1 as the middle class, 3 as the highest value and 0.65 as the lowest value?
Good day. I know getting the class interval given 3 as the highest value and 0.65 as the lowest value is easy. Here's the catch, the distribution of the interval starts at 1 which is considered as the ...
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92 views
How to set SMOTE parameters in R package DMwR?
For different imbalanced data-sets which rare class' proportion differ from 30% (rare) to 5% (rare), what is the best way to define the Perc.Over and ...
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37 views
How to handle unbalanced dataset on classes distribution?
I have a big data-set (KDD'99 dataset), with 3 million instances but has also really unbalance for the distribution of 4 classes. Is there any way to balance the data-set as keeping it consistent.
