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Data Range Limiter Field Guide: When Three Ranges Decide What Your Dataset Survives, and Where Clip, Filter, and Mark Actually Differ

Posted by By xiezixing 2026年10月6日
A field guide to the Data Range Limiter — the three handling strategies (clip, filter, mark), how the auto-detect IQR heuristic behaves on skewed data, what the statistics block tells you, and the four pitfalls that turn a clean clip into silent corruption downstream.
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CSV Validator Field Guide: When Row 873 Crashes But The Fault Is On Row 12

Posted by By xiezixing 2026年9月3日
Five structural CSV checks that catch malformed rows, unbalanced quotes, and header mismatches before your importer does.
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CSV Validator Field Guide: When Four Structural Checks Beat A Parser Pass

Posted by By xiezixing 2026年8月30日
One unbalanced quote in a million-row file is not a syntax error — it is…
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Why Two Rows That Look Like Duplicates Are Not Always the Same Person: A Field Guide to Multi-Column CSV Deduplication

Posted by By xiezixing 2026年7月31日
Why Two Rows That Look Like Duplicates Are Not Always the Same Person: A Field…
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Why Your Realistic Test Data Is Not Stressing Your Code

Posted by By xiezixing 2026年7月31日
Why Your "Realistic" Test Data Is Not Stressing Your Code Your parser was tested on…
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Why Your Sensor Data Is Lying to You: A Field Guide to Clipping, Filtering, and Marking Out-of-Bounds Values

Posted by By xiezixing 2026年7月28日
The Bottom Line Out-of-bounds values are not the problem. They are the signal. The choice…
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Before You Delete an Outlier - six question data cleaning protocol
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Before You Delete an Outlier: A 6-Question Data Cleaning Protocol

Posted by By xiezixing 2026年7月17日
A practical protocol for detecting, marking, and processing extreme values without deleting useful evidence.
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SEDOL validation explained with seven characters one check digit and a weighted mod 10 control
Posted in未分类

Seven Characters, One Check Digit: Catch a Bad SEDOL Before It Reaches Your Books

Posted by By xiezixing 2026年7月13日
A practical guide to SEDOL-7 format rules, weighted mod-10 validation, and where securities-data pipelines should catch a bad identifier.
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Cover image: the three switches that decide whether your deduplication is real
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The Three Switches That Decide Whether Your Duplicate-Line Count Is Real

Posted by By xiezixing 2026年7月2日
Three switches decide every deduplication: mode, case sensitivity, and trim. Get any of them wrong and your deduplicated output is either a bloated list or an aggressive cleaner that threw away 30 percent of your data.
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The first line of your CSV is doing more harm than you think
Posted in未分类

The first line of your CSV is doing more harm than you think

Posted by By xiezixing 2026年6月29日
Why the first row quietly breaks the rest of the file A CSV is supposed…
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