Sep 8 2024
Using Regression to Improve Quality | Part II – Fitting Models
This is a personal guided tour of regression techniques intended for manufacturing professionals involved with quality. Starting from “historical monuments” like simple linear regression and multiple regression, it goes through “mid-century modern” developments like logistic regression. It ends with newer constructions like bootstrapping, bagging, and MARS. It is limited in scope and depth, because a full coverage would require a book and knowledge of many techniques I have not tried. See the references for more comprehensive coverage.
To fit a regression model to a dataset today, you don’t need to understand the logic, know any formula, or code any algorithm. Any statistical software, starting with electronic spreadsheets, will give you regression coefficients, confidence intervals for them, and, often, tools to assess the model’s fit.
However, treating it as a black box that magically fits curves to data is risky. You won’t understand what you are looking at and will draw mistaken conclusions. You need some idea of the logic behind regression in general or behind specific variants to know when to use them, how to prepare data, and to interpret the outputs.
Nov 6 2024
Rebuilding Manufacturing in France | Radu Demetrescoux
Radu Demetrescoux has been a manufacturing consultant for 25 years and recently authored a Lean Toolbox (in French) with actionable details on 64 tools. He has seen the French manufacturing sector losing half its factories and is working to rebuild it. This is how he explains what happened and the way forward. It includes an endorsement of our Introduction to Manufacturing as a contribution to this effort!
The Numbers
Between 1995 and 2015, France lost almost half of its factories and a third of its industrial jobs. In French economic statistics, the industry sector encompasses extraction and refining in addition to manufacturing. The share of Industry in GDP has fallen from 35% in 1970 to less than 20% currently. The share of manufacturing in GDP fell to 11% in 2017 compared to 17% in 1995. The objective stated by the government is to quickly increase the share of manufacturing in GDP to 15%.
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By Michel Baudin • Personal communications, Uncategorized • 0