Online Safety Community

Misinterpretation of closed Data when Treated with “Normal” Statistical Methods

Geology is among the many branches of science in which compositional data (CoDa) arise naturally. In branches such as geochemistry, compositional data seem to occur typically, when one normalizes raw data or when one obtains the output from a constrained estimation procedure, such as percentages, ppm, ppb, molar concentrations, etc.

Compositional or constrained data have proved difficult to handle statistically because of the awkward constraint that the components of each vector must sum to unity. The special property of compositional data (the fact that the determinations on each specimen sum to a constant) means that the variables involved in the study occur in constrained space defined by the simplex, a restricted part of real space.

It is important for geochemists and geologists in general to be aware of the fact that the usual multivariate statistical techniques are not applicable to compositional data. They need to have access to appropriate techniques as they emerge and become available.

Pearson was the first to point out dangers that may befall the analyst who attempts to interpret correlations between Ratios whose numerators and denominators contain common parts. More recently, Aitchison, Pawlowsky-Glahn, S. Thio, and other statisticians have developed the concept of Compositional Data Analysis, pointing out the dangers of misinterpretation of closed data when treated with “normal” statistical methods.

Learning about all elements of CoDa

A webinar from Compliance4All, a leading provider of professional trainings for all the areas of regulatory compliance, will throw light on all the important aspects of CoDa. At this session, Ricardo Valls, a professional geologist with thirty years in the mining industry, and who has extensive geological, geochemical, and mining experience, managerial skills, and a solid background in research techniques; will be the speaker.

To gain insights into CoDa, please enroll for this webinar by visiting  real case studies developed

At this session, Ricardo will present several real case studies he has developed, to demonstrate the advantages of applying various aspects of the CoDa analysis in the search for and evaluation of ore bodies by comparing them with regular statistical modelling of geochemical data.

At this webinar, which will be of high value to personnel involved in mining, such as Geologists, Geochemists, Exploration Personnel, Graduate Students, and Post-Graduate Students; Ricardo will cover the following areas:

o  History of the Problem

o  The Current Situation

o  The Model

o  Normal Statistical Processing of the Data

o  Compositional Data Analysis

o  Factor and Principal Component Analysis

o  Dealing with zero and b.d.l. Values

Conclusions and Recommendations.

For more click the advantages of applying different aspects

Views: 11

Comment

You need to be a member of Online Safety Community to add comments!

Join Online Safety Community

Take our poll!

Take our poll!

Latest Activity

John Robinson posted a blog post

Regulations in the US and EU Dealing with Combination Products

Registering and maintaining combination products in the US and the EU is a bit tricky, because these are disparate markets that are governed by different sets of regulations which are independent of each other. So, any business that wants to market combination products into the US or the EU must be completely aware of the nature and meaning of all the regulations. Such businesses…See More
19 hours ago
Adam Fleaming posted blog posts
19 hours ago
Alex posted a blog post

3 essential electrical safety tips for new students

Living away from home for the first time is an exciting, invigorating, and pretty daunting experience. While your first days at uni will be the time of your life, living away from your parents also comes with a new set of challenges.Aside from cooking and cleaning, one thing we take for granted is our parents’ knowledge of how to keep us safe. Electrical safety, in particular, is something not many first-time students know a lot about, but electrical accidents are…See More
20 hours ago
Training Doyens posted events
20 hours ago

Forum

Occupational Health and Safety 5 Replies

Health and safety are important aspects of an organisation’s smooth and effective functioning.  Did you know that workplace health & safety injuries cost Australian businesses over $60 billion…Continue

Tags: Safety, and, Health, Occupational

Started by WHS Solutions. Last reply by Tara safe yesterday.

QlikView for its Safety Strategic Business Intelligence Solution Worldwide

QlikTech (NASDAQ:QLIK), a leading…Continue

Tags: Qlikview, safety

Started by nicolewells on Wednesday.

What's your favorite motivational/safety quote? 102 Replies

Favorite Motivational Quote: If you want something, you'll find a way - If not, you'll find an excuse.Favorite Safety Quote: Don't learn safety by accident!Continue

Started by Michelle Sears. Last reply by David Collins on Tuesday.

Business Intelligence with Big Data happens at Unipê

the college center of João Pessoa will preserve the 1st assembly at big records, geared toward professionals inside the regions of administration, economics, public control and facts technologies.…Continue

Tags: qliksensetraining, qliksenseonline, qliksense

Started by Soujanya Naganuri Nov 1.

Road Safety Solutions 13 Replies

The Road Safety Signs ,Barriers,Humps,Hazard Markers and Visual Warnings are some of the important marks to be observed. Signs such as "keep left",stop, "give way" should not be casually treated.…Continue

Tags: safety, gear, wear, Equipment, &

Started by Enna Henry. Last reply by Barry Oct 26.

Badge

Loading…

© 2017   Created by Safety Community.   Powered by

Badges  |  Report an Issue  |  Terms of Service