Brag Meeting 30th August 2018

When: Thursday 30th August 2018, 13:00-14:00.

Location: GP-Y801.

Included in meeting: 

The fortnightly BRAG meeting will be held tomorrow 30th August 2018 at 1pm in room Y801. This week we will have presentations by Edgar and Matt.

Edgar’s Talk:

Title: We are what we eat: Providing a better protection for the consumers using statistics

Abstract: Some bacteria pose a substantial risk to the human health when they are present in foodstuff. More than 5 million food poisoning cases are estimated every year just in Australia.
Acceptance sampling is the primary statistical technique for separating contaminated batches of food from the good ones. However, food safety sampling is costly, destructive and time-consuming. The purpose of this work was to find inspection plans that allows a reduction of the number of samples required, while providing a better protection for the consumers. We proposed a new double sampling procedure that reduces the sampling cost between 20 and 75%.

Matt’s Talk:

Title: An introduction to the Zig-Zag Process

Abstract: In this talk, I will introduce the basic ideas and computational details of the Zig-Zag process. The zig-zag process is an example of a relatively new class of Monte Carlo algorithms based on continuous-time rather than discrete-time Markov processes. Advantages of the Zig-Zag process are better mixing properties and the use of subsampling with control variates to achieve essentially independent samples from the posterior at a computational cost which does not depend on the size of the dataset. Key challenges of implementing the Zig-Zag are:

  1. Simulation
  2.  of time in homogeneous Poisson Processes
  3. Constructing
  4. realisations from the continuous time Markov process

The basic implementation of some examples is given in R and can be provided on request.

We look forward to seeing you all there!

Regards

Farzana and Trish

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