Elena Petrova
Data Science
Elena writes data studies and benchmarks, and about the quality of collected data: how to measure it, clean it and build datasets that hold up.
Writes about
- Data studies and benchmarks
- Data quality
- Dataset building
Articles by Elena Petrova
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October 26, 2026 · Knowledge
AI Training Data Marketplaces & Licensing: When to Buy vs Collect
How AI training data marketplaces and licensing deals work, what licensed data really costs you, and a practical framework for deciding when to buy a dataset and when to collect it yourself.
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October 24, 2026 · Knowledge
Provenance in the AI Training Pipeline: Proving Where Your Dataset Came From
What AI training data provenance means in practice: the record to keep for every document, what the EU AI Act summary asks for, and how to carry it through.
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October 19, 2026 · Scraping
Retry Economics: The Attempt Number Where Retrying Stops Paying for Itself
Each retry is less likely to succeed than the last. How to measure where retrying stops paying off, using your own logs and a few lines of Python.
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October 15, 2026 · Residential Proxies
Understanding ASN Diversity in Residential Proxy Networks
A big IP count says little if most addresses sit on a few networks. How to measure ASN diversity in a proxy pool, which metrics to use and what good looks like.
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October 11, 2026 · Knowledge
Do CAPTCHAs Stop Bots or Just Slow Them Down? Measuring Deterrence Against Solve Rate
What two decades of research says about CAPTCHAs: how long they cost humans, how often bots and AI agents solve them, and why they now work as a cost.
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October 8, 2026 · Scraping
Payload Efficiency: What Share of a Scraped Page Is Boilerplate You Paid For
We measured 278 content pages from the top 1,000 sites. The text you want is about 1% of the HTML and a tiny share of what a browser downloads.
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October 7, 2026 · Residential Proxies
Shifter Now Has the Largest Live US Residential IP Pool
We re-ran Shifter through our residential proxy benchmark: 212,212 live US IPs in 250,000 requests, the largest live US pool of the 16 networks we have measured.