Statistical process control after W. Edwards Deming

[Tomte]

https://www.2uo.de/deming/

[pps43]

> there isn't a hard theorem why they should sit at +/-3σ

There is Vysochanskij-Petunin inequality [1]. 95% of observations should fall within +/-3σ away from the mean, assuming unimodal distribution and finite variance.

[1] https://en.wikipedia.org/wiki/Vysochanskij%E2%80%93Petunin_i...

[conformist → pps43]

Thanks, I wasn't aware of this and it seems very useful! Good to know a tighter bound than Chabyshev's inequality (assuming unimodality).

[oso2k → conformist]

It's also where Six Sigma (3 sigma on each side) comes from. It implies "Total Control".

[curiouscats]

Online resources on applying Deming's ideas https://blog.deming.org/online-deming-resources/

[conformist]

If I remember correctly, Deming was a key inspiration for Charles Koch's (of Koch industry fame/notoriety) managerial strategy.

See also https://en.m.wikipedia.org/wiki/The_Science_of_Success

[hbarka]

Philip B. Crosby and Joseph M. Duran

[kristianp → hbarka]

It's actually Joseph M. Juran, sounds the same if you're listening to an audiobook.

[hbarka → kristianp]

Yes, you’re absolutely right. Iphone spellcheck likes Duranduran. My department worshipped Juran when we were manufacturing things.