The View from Eigenvector

EigenNews and EigenViews from Barry and the Eigenvector staff.

The View from Eigenvector

Missing Data (part three)

Nov 21, 2011

In the first and second installments of this series, we considered aspects of using an existing PCA model to replace missing variables. In this third part, we’ll move on to using PLS models. Although it was shown previously that PCA can be used to perfectly impute missing values in rank deficient, noise free data, it’s […]

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2011 EAS Awards for NIR and Chemometrics

Nov 17, 2011

I had the privilege of being involved with two award sessions at this week’s Eastern Analytical Symposium (EAS). I was very pleased to be invited to speak in the session honoring former Eigenvectorian Charles E. “Chuck” Miller for Outstanding Achievements in Near Infrared Spectroscopy. Chuck elected to have talks from speakers that represented phases in […]

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Missing Data (part two)

Nov 11, 2011

In Missing Data (part one) I outlined an approach for in-filling missing data when applying an existing Principal Components Analysis (PCA) model. Let us now consider when this approach might be expected to fail. Recall that missing data estimation results in a least-squares problem with solution: xb = –xgR21R11-1 In our short courses, I advise […]

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What’s in a Logo?

Nov 7, 2011

Branding is an important aspect of promoting a business and central to that is developing an identifiable logo. I like logos, (and sometimes wish I could be a graphic designer). The best logos, besides looking great, have a deep connection to the thing they represent. Coming up with a good one is quite an exercise. […]

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Missing Data (part one)

Nov 5, 2011

Over the next few weeks I’m going to be discussing some aspects of missing data. This is an important aspect of chemometrics as many applications suffer from this problem. Missing data is especially common in process applications where there are many independent sensors. I got interested in missing data while in graduate school in the […]

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PLS_Toolbox/Solo Advanced Features in NJ

Nov 2, 2011

Eigenvector Vice-president Neal B. Gallagher and Chief of Technology Development Jeremy M. Shaver will present Using the Advanced Features in PLS_Toolbox/Solo 6.5 in New Brunswick, NJ on December 8-9, 2011. The course will be held at the Hyatt Regency. With PLS_Toolbox and Solo Version 6.5 released last month, this is an opportune time to attend […]

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