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Write a function to detect anomalies in streaming data using a sliding window.

Python/Codinghard0.4 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Disney+ Hotstar
Key Concepts Tested
window
Expert AnswerPremium
73 wordsInterview-ready
**Approach:** Maintain window (deque). Compute rolling mean, std. Flag if value beyond k*std (e.g., 3-sigma). For streaming: update incrementally (Welford's algo for running mean/var). **Robustness:** Mean/std sensitive to outliers. Use median + MAD for robust. Or EWMA for trend....
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