Announcing the September meeting of the WA Branch of the Statistical Society of Australia. All visitors are welcome to attend this event.

We are pleased to host our guest speaker Honorary Associate Professor Ute Mueller of Edith Cowan University.

Presentation

Geostatistics for Regionalised Compositions

Honorary A/Prof Ute Mueller, Edith Cowan University.

In this talk I will provide an overview of the geostatistical treatment of compositional data. Compositional data are vectorial data with positive components that add up to an arbitrary, but fixed constant c. A regionalized composition then is a set {z(u) = [z₁(u), ... , z_D(u)]: z_k(u) > 0, k = 1, ... , D; å z_k(u) = c, u Î A} of compositional data defined on some study region A, where u Î A denotes a location in A. Data of this nature are common in the earth sciences, for example in regional geochemical surveys or ore deposits, where not only the value elements but also contaminants need to be accounted for.

Any statistical treatment of these data needs to be multivariate and model the composition as a whole rather than just its component parts. As a consequence in the last 40 years compositional data analysis has emerged as a discipline and the first implementation of compositional geostatistical modelling followed soon after.

It is common that prior to any analysis (be it statistical or geostatistical) a logratio transformation is applied. Geostatistical techniques, including estimation and simulation may then be applied to the transformed data, followed by the appropriate backtransformations. The various techniques and their evaluation will be illustrated via a mining data set.

About the Speaker

Ute Mueller is an Honorary Associate Professor at the School of Science at Edith Cowan University (ECU). She has been doing research in the area of geostatistics since the early 2000s and became interested in geostatistics for compositional data about 10 years ago.

Refreshments and Dinner

Members and visitors are invited to mingle over wine and cheese from 5:30PM onwards at the venue.

Following the meeting all are invited to dine at a nearby restaurant. Visitors are welcome.

Meeting directions

The Cheryl Praeger Lecture Room is located on the ground floor of the Mathematics building at The University of Western Australia. Its entrance is on the northern side of the building. See: UWA Maps, Google Maps.

Parking is free on the UWA Crawley campus after 5:00PM. A convenient place to park is Car Park 18 accessible from Fairway Entry 1.

Remote Viewing Option

For those that cannot attend in-person, the presentation will be streamed live over Zoom. Please register on this page to get the connection details.

For further information please contact the WA Branch Secretary (ssa.wa.secretary@gmail.com).