Questions tagged [localoutlierfactor]

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Why is One Class SVM predicting that half my dataset consists of outliers?

I am currently working on a dataset with 14 continuous features, a categorical target over five classes, and 90,000 samples. My current goal is to explore outliers in the dataset, and to that end I ...
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27 views

Local outlier factor plot

I'm trying to visualize results from LOF algorithm. I came across a type of graph a few times and it makes me question if the calculations I'm doing are correct. The type of graphs I'm talking about ...
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1answer
85 views

Anomaly detection on high dimensional Data using k means/SVM/LOF?

I am working on one Anomaly detection problem (unsupervise problem) Data set have 1) 15 columns and around 8k rows , including normal and abnormal(outlier ) rows, without label , all are numeric ...
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2answers
612 views

When forecasting, is it better to remove the outliers or just to transform them?

I am forecasting the number of logins. I have a dataset with the number of logins for each hour. First, I use LOF (local outlier factor) to find the outliers and then I remove them. Second, I use ...
2
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1answer
826 views

Should you normalize your training data for Local Outlier Factor

Say I'm using scikits implementation of Local Outlier Factor with euclidean distance being used by the reachability function. My input features are magnitudes apart, so is it advisable that I ...
2
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1answer
399 views

LOF (Local Outlier Factor) choosing the value of k

Just want to understand one thing. Let's say for any data set I select k=20 and generate LOF for each point and then I show all the points in the descending order of its LOF. Now when I am analyzing ...
3
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0answers
589 views

Difference between identifying outliers using LOF and K-means clustering

I am identifying outliers using K-means and LOF (Local Outlier Factor). Let's say if we are identifying possible outliers using both the techniques, I believe LOF will pick global outliers also as ...