A Linear Algebra Approach to the Vector Space Model

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Data Mining, information retrieval, ir, minerazzi, text mining, Vector Space Models

Another fast-track tutorial updated and improved is back!

This is a fast track tutorial on vector space calculations. A linear algebra approach is used. The tutorial covers term-document and term-query matrices, matrix transposition, dot products, cosine similarities, and local and global weights.

PCA and SPCA Tutorial

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Algorithms, data miners, Data Mining, information retrieval, minerazzi, mining, news, PCA, statistics, SVD, text mining, tools

The PCA and SPCA Tutorial is back.

This is an improved and updated legacy tutorial on Principal Component Analysis (PCA) and one of its variants, Standardized PCA (SPCA). Both are techniques for identifying unknown trends in multidimensional data sets.

Despite the fact that one can find online many tutorials on PCA, undergraduate and graduate students are rarely exposed to the algorithm.

On the other hand, the fact that SVD can be used in both PCA and LSI (LSA) have induced some to assume, that PCA is LSI. Actually, PCA is neither LSI (LSA) nor Factor Analysis. Why? Good question. Check the tutorial at

 

Classic Information Retrieval Tutorials Are Back!

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data miners, Data Mining, information retrieval, miner, minerazzi, miners, mining, news, term vector theory, text mining

1. Starting with our classic Term Vector Theory series, we are republishing our series of tutorials on Information Retrieval from the early and mid 2000s. See http://www.minerazzi.com/tutorials/

2. A new miner on the Zika Virus is now available online at http://www.minerazzi.com/zika/

3. Additional miners are listed at http://www.minerazzi.com/

Zika Virus Resources: A New Miner

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Data Mining, deceases, health news, minerazzi, miners, salud, virus news, zika, zika virus, zikv

Zika Virus Resources is a new miner available at http://www.minerazzi.com. Find Zika Virus (ZIKV) Disease resources from CDC, NIH, WHO, and other sources.

A Novel Mnemonic for the Rydberg Rule: Updated Version

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chemical mining, chemistry, chemistry myths, chemistry tutorials, electron configurations, Madelung Rule, minerazzi, mining, mnemonics, Rydberg Rule

I have uploaded a new, updated, and improved version of the tutorial:

A Novel Mnemonic for the Rydberg Rule,

http://www.minerazzi.com/tutorials/rydberg-rule-mnemonic.pdf

Abstract – This tutorial presents a new mnemonic describing the filling order of atomic orbitals according to the Rydberg Rule. The mnemonic accounts for the reordering of atomic orbitals and the large orbital energy gaps responsible for the periodicity of elements.

A mnemonic is a memory aid device designed to improve recall. Mnemonics are popular tools in the classroom because help teachers and students to summarize large amounts of information without necessarily explaining facts. Conversely, mnemonics based on fallacies and blunders, or divorced from experimental results, can cause students more harm than good in their undergraduate studies.

At the time of writing, one cannot find in the chemical literature a straightforward mnemonic for writing electron configurations according to the Rydberg Rule. The purpose of this tutorial is to present such a novel mnemonic and, in the process, help chemistry students to properly write electron configurations.

Conceptual differences between the Madelung and Rydberg rules are identified and addressed. Myths and folklore-hilarious concepts regarding to the filling order of atomic orbitals are debunked.