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Written by Johan Trygg   
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Editorial flash
Can we use the regression coefficient profile for selecting PLS components?
The linear model y=Xb + f is often used in chemometrics. Unfortunately, we have put too much emphasis on the importance of the regression coefficient profile b, and mistakenly assumed or believed that it should be a good estimate of the "pure profile". This is not true, and I will argue why in later editorials. But this time, I want to address an earlier question that was posed in relation to the regression coefficient profile.
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News flash
Discussion Forum is available again

Dear Chemometrics.se visitor,

Due to the many requests to reopen the Chemometrics Discussion Forum, I have made it available here at Chemometrics.se (under Discussion Forum in the menu).

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Tutorial flash
Why PLS sometimes has more than one component?
I want to discuss some algebraic aspects of the popular OLS and PLS regression methods in chemometrics taken from my thesis (2001). The main point I want to make here is that single-y PLS models should only have one (predictive) component.
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