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: 18


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

Mark Nilson posted events
15 hours ago
Training Doyens posted events
15 hours ago
Nakul Pratap posted a blog post
16 hours ago
Elena Lauren posted an event

Live Informatica Training | Informatica Course by Experts - Enroll Now! at 1734 Blue Lake, CT Tarpon Springs FL 34689 United States (US)

March 19, 2018 to December 25, 2018
Why Informatica?Informatica provides the market's leading data integration platform. Tested on nearly 500,000 combinations of platforms and applications, the data integration platform inter operates with the broadest possible range of disparate standards, systems, and applications.This unbiased and universal view makes Informatica unique in today's market as a leader in the data integration platform.Informatica PowerCenter is a premium data integration solution available today.What are…See More
18 hours ago


Understanding Data Parallelism in MapReduce

In order to understand the goals of MapReduce, it is important to realize for which scenarios MapReduce is optimized. The MapReduce programming model is created for processing data which requires…Continue

Tags: program, Implementation, Mapreduce

Started by gracylayla on Wednesday.

Automation Anywhere. How do I pick a value from dropdown

Automation Anywhere. How do I pick a value from dropdown. I tried 'set text' from a copied variable. Its very slow, and also doesnt…Continue

Tags: anywhere, automation

Started by emmablisa Mar 9.

TensorFlow serving vs TensorFlow service

I have a question regarding the difference between TensorFlow Serving versus TensorFlow service. (Sorry that I'm not familiar with this at all.)I found TensorFlow serving's definition, which is "…Continue

Tags: training, online, tensorflow

Started by emmablisa Feb 27.

Proper maintenance for Hi Vis clothing

Can you tell me how to properly take care of Hi Vis jackets? I recently purchased a few ones from this…Continue

Started by Lily Osborn Feb 25.

Forklift Operator Requirements 1 Reply

At our company we have a lot of forklift traffic that has to share the same aisles as our pedestrians. We limit the speed of our lifts to 3 mph.  I am wanting to find out what requirements for…Continue

Started by Rick Briggs. Last reply by Tony Ferraro Feb 25.



© 2018   Created by Safety Community.   Powered by

Badges  |  Report an Issue  |  Terms of Service