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Questions tagged [anomaly]

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1answer
23 views

Explaination of the anomalies detected

I have a dataset with a mixture of categorical and numeric variables. I have converted categorical variables into one hot encoding. I have used Isolation forest algorithm to extract 5% of the ...
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1answer
115 views

Anomaly Detection for Large Time Series Data [closed]

I am working on detecting anomalies within a large time series data set. It is updated on a regular basis and consists of more than 30 parameters. I am using R as a reference language. It is a first ...
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4answers
229 views

How to detect anomalous points

As is clear from the figure, the blue points, which don't follow the trend, are anomalous points. I'm wondering about the best non-parametric method to detect those points. I have tested some ...
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1answer
2k views

How to improve precision under imbalanced classification

I am using an imbalanced dataset (rare positive cases) to learn models for prediction and the final good AUC is 0.92 but the F1 score is very low0.2. Is it possible to add some key features which ...