W3C 2009 Conference

Here is the final list conforming the 18 International Conference of the W3C, WWW2009, of which AIRWeb2009 is a workshop. … More

Centering Data in PCA

I received yesterday the following email from a reader (name removed). I am reproducing it since the discussion might be … More

SIDIM XXIV Conference

I am presenting at The Seminario Interuniversitario de Investigación en Ciencias Matemáticas (Interuniversity Seminar on Mathematical Sciences Research, SIDIM). This is … More

Vector Normalization with Excel

Unit vectors are frequently used in information retrieval and data mining studies because simplify further calculations and analyses. In the current issue … More