Data Science

Questions tagged [anomaly]

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Anomaly detection in time series data from multiple sensors

I've build a classification model based on 15 features coming in real time from 15 different sensors. The window time is 60 seconds (which means that the classification model needs 60 records from ...
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1answer
24 views

Anomaly Detection System

I need a sanity check. I want to create an anomaly detection system. The logic which I am planning to use is the following: Find anomalies in the past using Seasonal Hybrid Extreme Studentized ...
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0answers
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How to find anomalies/outliers in Panel Data?

I have panel data based on 900000 different entities with 384 time steps and the data is not normally distributed. I am looking for outliers/anomalies, this is unsupervised as I have no examples of ...
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2answers
193 views

Anomaly detection without any knowledge about structure

I have an interesting question, my code needs to be able to handle structured data where I don't know much about the structure at development time. I know the samples follow a schema that can be ...
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1answer
53 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
236 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
306 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
3k 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 ...