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Part II of the TDDA Book is about reference testing. In conventional software testing a regression test is a test designed to detect a software regression—a defect that was previously not present, or had been fixed, in an earlier version of the software. In test-driven data analysis (TDDA), a reference test is a semantic regression test, i.e. one that checks that current outputs are meaningfully t
2 views
Testing Pyramid or Testing Trophy?
Read about these in Chapter 10 of Test-Driven Data Analysis, now free to read online at https://book.tdda.info/10.
#tdda #books
1 views
Chapter 5 of my book, Test-Driven Data Analysis, is now freely available online at:
https://book.tdda.info/book/chapter5.html.
The chapter is called Constraint Discovery and Validation, and is concerned with automatic generation of constraints from believed-to-be-good data and the use of of those constraints for validation of new data.
The Python open-source tdda library and command-line tools mak
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On Mastodon since
🔥 Top post: Part I of Test-Driven Data Analysis, covering Data Validation, i · 4 likes + reposts
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Chapter 11 of my TDDA book is now available to read for free at
https://book.tdda.info/book/11
This covers the specifics of testing analytical code with reference tests, supposed by the library.
#books #testing #tdda #datascience
Testing Pyramid or Testing Trophy?
Read about these in Chapter 10 of Test-Driven Data Analysis, now free to read online at https://book.tdda.info/10.
#tdda #books
Part II of the TDDA Book is about reference testing. In conventional software testing a regression test is a test designed to detect a software regression—a defect that was previously not present, or had been fixed, in an earlier version o…
Possibly unpopular opinion:
Font ligatures for code are a terrible idea, and will remain so unless/until
1. programming languages accept them as input
2. they become easy and obvious to type.
I am not sure how 2 would come about in pra…
Holes
https://xkcd.com/3266/
Chapter 7, of the TDDA Book—Practical Constraints—is now available online:
https://book.tdda.info/book/7
This completes the material on data validation, covering things like non-tabular data, spreadsheets, regularising measurements and the…
Chapter 6 of the TDDA Book, Custom Constraints, is now open at
https://book.tdda.info/book/6
This ones focuses on tricks and tips for going beyond the simplest constraints, including
- Individual value constraints
- Record-level (per-row…
I should have done this a couple of days ago.
Here are Edinburgh’s climate stripes, in graph form
https://showyourstripes.info/c/europe/unitedkingdom/edinburgh
#climatestripes #climate #sustainability
Chapter 5 of my book, Test-Driven Data Analysis, is now freely available online at:
https://book.tdda.info/book/chapter5.html.
The chapter is called Constraint Discovery and Validation, and is concerned with automatic generation of constra…
My tutorial on Test-Driven Data Analysis (TDDA) from #PyDataLondon2026 is up:
https://youtu.be/EH0WpGFAV_g
There are a few details at
https://www.tdda.info/pydata-london-2026-tdda-tutorial
and the slides are at
https://stochasticsolutions.…
Is it bad that Elon Musk has a trillion dollars? Yes, and here’s why
— Ingrid Robeyns (@ingridrobeyns) The Guardian
https://www.theguardian.com/commentisfree/2026/jun/17/is-it-bad-that-elon-musk-has-a-trillion-dollars-yes-and-heres-why
Als…
Testing Pyramid or Testing Trophy?
Read about these in Chapter 10 of Test-Driven Data Analysis, now free to read online at https://book.tdda.info/10.
#tdda #books
Part II of the TDDA Book is about reference testing. In conventional software testing a regression test is a test designed to detect a software regression—a defect that was previously not present, or had been fixed, in an earlier version o…
Possibly unpopular opinion:
Font ligatures for code are a terrible idea, and will remain so unless/until
1. programming languages accept them as input
2. they become easy and obvious to type.
I am not sure how 2 would come about in pra…
Holes
https://xkcd.com/3266/
Chapter 7, of the TDDA Book—Practical Constraints—is now available online:
https://book.tdda.info/book/7
This completes the material on data validation, covering things like non-tabular data, spreadsheets, regularising measurements and the…
Chapter 6 of the TDDA Book, Custom Constraints, is now open at
https://book.tdda.info/book/6
This ones focuses on tricks and tips for going beyond the simplest constraints, including
- Individual value constraints
- Record-level (per-row…
I should have done this a couple of days ago.
Here are Edinburgh’s climate stripes, in graph form
https://showyourstripes.info/c/europe/unitedkingdom/edinburgh
#climatestripes #climate #sustainability
Chapter 5 of my book, Test-Driven Data Analysis, is now freely available online at:
https://book.tdda.info/book/chapter5.html.
The chapter is called Constraint Discovery and Validation, and is concerned with automatic generation of constra…
My tutorial on Test-Driven Data Analysis (TDDA) from #PyDataLondon2026 is up:
https://youtu.be/EH0WpGFAV_g
There are a few details at
https://www.tdda.info/pydata-london-2026-tdda-tutorial
and the slides are at
https://stochasticsolutions.…
Is it bad that Elon Musk has a trillion dollars? Yes, and here’s why
— Ingrid Robeyns (@ingridrobeyns) The Guardian
https://www.theguardian.com/commentisfree/2026/jun/17/is-it-bad-that-elon-musk-has-a-trillion-dollars-yes-and-heres-why
Als…
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On Mastodon since
Aug 2024
An established account with real history on the platform.
💡 Facts
🗓️Joined Mastodon in 2024 — 1 year ago.
👁️Averages 2 views per post.
📤Posts about 1.8× per week.
🕵️ Fake follower check
Estimated70/100
Good
Credibility score
87%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 87% real, active audience · Low fake-follower risk.
- Engagement (~1.1% of followers engage each post) is around typical for Mastodon.
- Verified account.
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Stochastic Solutions Limited
Test-Driven Data Analysis.
Jazz • Maths • Whisky
100% inheritance tax
Born at 320 ppm CO₂.
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