Questions tagged [localoutlierfactor]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
1answer
13 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 ...
1
vote
2answers
272 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 ...
1
vote
1answer
417 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 ...
1
vote
1answer
305 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 ...
2
votes
0answers
428 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 ...