The Long, Complicated, Tedious, and Difficult Route to Principal Components: Part IV Jun 1, 2008 By: Howard Mark, Jerome Workman, Jr.

Howard Mark and Jerome Workman, Jr. continue their discussion of the derivation of the principal component algorithm using elementary algebra.

The Long, Complicated, Tedious, and Difficult Route to Principal Components: Part III (Or, "When you're through reading this set you'll know why it's always done with matrices.") May 1, 2008 By: Howard Mark, Jerome Workman, Jr.

Howard Mark and Jerome Workman, Jr. continue their discussion of the derivation of the principal component algorithm using elementary algebra.

The Long, Complicated, Tedious, and Difficult Route to Principal Components: Part II Feb 1, 2008 By: Howard Mark, Jerome Workman, Jr.

Howard Mark and Jerome Workman, Jr. continue their discussion of the derivation of the principal component algorithm using elementary algebra.

The Long, Complicated, Tedious, and Difficult Route to Principal Components: Part I Sep 1, 2007 By: Jerome Workman, Jr., Howard Mark

In this month's installment, columnists Howard Mark and Jerome Workman, Jr. present the derivation of the principal component algorithm using elementary algebra.

Addendum to Chemometrics in Spectroscopy Corrections to Analysis of Noise: Part II Jun 1, 2007 By: Jerome Workman, Jr., Howard Mark

This column is the continuation of a series (1-5) dealing with the rigorous derivation of the expressions relating the effect of instrument (and other) noise to its effects on the spectra we observe. Our first column in this series was an overview. While subsequent columns dealt with other types of noise sources, the ones listed analyzed the effect of noise on spectra when the noise is constant detector noise (that is, noise that is independent of the strength of the optical signal). Inasmuch as we are dealing with a continuous series of columns, on this branch in the thread of the discussion, we again continue the equation numbering and use of symbols as though there were no break. The immediately previous column (5) was the first part of this set of updates of the original columns.

What Can NIR Predict? Jun 1, 2007 By: Howard Mark, Jerome Workman, Jr.

Columnists Howard Mark and Jerome Workman, Jr. discuss the application of chemometric methods of relating measured NIR absorbances to compositional variables of samples.

Corrections to Analysis of Noise: Part I May 1, 2007 By: Jerome Workman, Jr., Howard Mark

Columnists Howard Mark and Jerome Workman, Jr. respond to reader feedback regarding their 14-part column on the analysis of noise in spectroscopy by presenting another approach to analyzing the situation.

Limitations in Analytical Accuracy, Part II: Theories to Describe the Limits in Analytical Accuracy and Comparing Test Results for Analytical Uncertainty Feb 1, 2007 By: Jerome Workman, Jr., Howard Mark

In the second part of this series, columnists Jerome Workman, Jr. and Howard Mark continue their discussion of the limitations of analytical accuracy and uncertainty.

Limitations in Analytical Accuracy, Part I: Horwitz's Trumpet Sep 1, 2006 By: Jerome Workman, Jr., Howard Mark

September 2006. In the first part of this two-part series, columnists Jerome Workman, Jr. and Howard Mark discuss the limitations of analytical accuracy and uncertainty.