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Howard Mark
Articles
Why Does -1 x -1 = 1?
February 01, 2021
Mathematics is a formal logic system, perhaps the ultimate formal logic system. Here we describe the elegance of the foundations of the mathematics that chemometrics is based on.
Classical Least Squares (CLS), Part 3: Expanding the Analysis to Include Concentration Information on Principal Component Regression (PCR) and Partial Least Squares (PLS) Algorithms
October 01, 2020
We explore how different algorithms and different numbers of factors affect the results.
A Survey of Chemometric Methods Used in Spectroscopy
August 01, 2020
We provide a scorecard of chemometric techniques used in spectroscopy. The tables and lists of reference sources given here provide an indispensable resource for anyone seeking guidance on understanding chemometric methods or choosing the most suitable approach for a given analysis problem.
One Real Challenge That Still Remains in Applied Chemometrics
June 01, 2020
In celebration of Spectroscopy’s 35th Anniversary, leading experts discuss important issues and challenges in analytical spectroscopy.
2020 Review of New Spectroscopic Instrumentation
May 01, 2020
Our annual review of products introduced at Pittcon or during the previous year.
More About CLS, Part 2: Spectral Results (Not Needing Constituent Values) and CLS
February 01, 2020
A previous analysis of data is compared to the results achieved using classical least squares and principal component analysis. What did we learn?
Review of New Spectroscopic Instrumentation 2019
May 01, 2019
Our annual review of products introduced at Pittcon or during the previous year
Using Reference Materials, Part I: Standards for Aligning the X-Axis
February 01, 2019
The use of reference materials to align or test the wavelength–wavenumber axis for optical spectroscopy is essential for quantitative and qualitative methods. This article provides details for using reference materials with ultraviolet, visible, near-infrared, infrared, and Raman spectroscopy methods.
Outliers, Part III: Dealing with Outliers
October 01, 2018
What are the steps to take once an outlier is discovered? There are several options.
Review of New Spectroscopic Instrumentation for 2018
May 01, 2018
Our annual review of spectroscopy products, broken down into the following categories: Atomic Spectroscopy, Florescence, Mass Spectrometry, Mid-IR, NIR, NMR and ESR, Raman, UV-vis, X-ray, Software, Accessories, Components