ECOTOX-U

SSD Model Averaging
2023-08-18 10:30 - 12:00 (Australia/Melbourne) | https://staging.ecotox.science/event/ssd-ma/
Virtual interactive tutorial with Professor David Fox (Free with purchase of online course “Introduction to Model Averaging and ssdtools in R”)

Interested in model averaging? Want to know how model weights to apply and use model averaging with speciecs sensitivity distributions (SSDs)? Want to learn about SSD model fitting using ssdtools and the interactive, online version – shiny(ssdtools)?Join Professor David Fox in this live, interactive tutorial in which he walk you through the basics of fitting SSDs in R. Starting with the R package fitdistrplus, you will be shown how to extract AIC values and other information from a fitted SSD and use those to compute the model weights for each component SSD. Using R, you will be shown how to compute a model-averaged HCx value b y first writing your own code, and then using the ssdtools package. Topics to be covered include:

dealing with bimodality in SSDs

using fitdistrplus to fit SSDs

constructing a model-averaged SSD in R ‘by hand’

how to fit a mixture distribution (eg: 2 lognormal distributions or a lognormal and a logLogistic distribution) to bimodal data in R

using the ssdtools package

using shiny(ssdtools)

Frequentist Model Averaging
2023-08-16 10:30 - 12:00 | https://staging.ecotox.science/event/frequentist-ma/
Virtual interactive tutorial with Professor David Fox (Free with purchase of online course “Introduction to Model Averaging and ssdtools in R”)

Interested in model averaging? Want to know how model weights are calculated and used? Want to understand how model-averaged estimates are obtained?Join Professor David Fox in this live, interactive tutorial in which he will explain how the AIC criterion is used to compute model weights. Using R you will be shown how to fit general and generalized linear models, assess goodness-of-fit and to obtain model-averaged estimates and confidence intervals. Topics to be covered include:

assessing the fit for nested models

use R to compute model weights ‘by hand’

fitting a generalized linear model to binomial data and assessing using analysis of deviance

using the drc and drda packagaes in R for concentration-response (C-R) modelling

obtaining a model-averaged ECx

inference for a model-averaged estimate

Model Averaging - Fundamentals
2023-08-14 10:30 - 12:00 | https://staging.ecotox.science/event/model-averaging-fundamentals/
Virtual interactive tutorial with Professor David Fox (Free with purchase of online course “Introduction to Model Averaging and ssdtools in R”)

Interested in model averaging? Want to know understand the fundamentals? Then this is the place to start.Topics to be covered include:

goodness-of-fit metrics and measures of ‘closeness’

entropy

Kullback-Leibler information

Akaike’s Information Criterion (AIC) and AIC corrected (AICc)

assessing the adequacy of model fits using AICc

Examples using R – regression models and fitting concentration-response (CR) models

Concentration-Response Modelling using R
2023-08-11 09:00 - 16:00 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia
Learn about all the latest developments in CR modelling covering both Frequentist and Bayesian frameworks.

Go to SETAC-AU 2023 website

More information

SETAC AU 2023 - Day 3
2023-08-10 00:00 - 23:59 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia

SETAC AU 2023 - Conference Dinner
2023-08-09 18:30 - 23:30 | The Museum of Tropical Queensland, 70 - 102 Flinders Street, Townsville, Queensland, 4810, Australia

SETAC AU 2023 - Day 2
2023-08-09 08:45 - 18:45 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia

SETAC AU 2023 - Day 1
2023-08-08 00:30 - 18:45 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia

SETAC AU 2023 - Welcome Reception
2023-08-07 17:30 - 19:30 | Townsville Surf Club, 80 The Strand, Townsville, 4810, Australia

New developments in SSD modelling and GV derivation
2023-07-27 10:00 - 11:00 | https://staging.ecotox.science/event/test-event/
An interactive meeting with Professor David Fox, Dr. Graeme Batley, Dr. Rick van Dam, Dr. Rebecca Fisher and Dr. Joe Thorley.

Your questions about the Burrlioz replacement answered by the experts

While not without its problems and limitations, Burrlioz has served the Australian-New Zealand Ecotox community incredibly well over the past ~ 25 years. It’s now time to retire Burrlioz and roll-out new-generation software that embeds the latest developments in SSD modelling. The core development team will give you an update on:

Austalian-Canadian SSD collaboration over the past 4 years

What’s new, what’s going to change

new developments in CR modelling – Bayesnec and the No Significant Effect Concentration (NSEC)

model averaged SSDs

using mixture distributions to fit SSDs

Implications for GVs and DGVs

accessing the new software

computational issues

implementation strategy and managing the transition

Webinar Test
2023-07-08 13:00 - 23:59 | https://staging.ecotox.science/event/webinar-test/

Short Course - Model Averaging
2023-06-19 00:00 - 2023-08-12 23:59
Get a head start on the latest developments in SSD modelling!

This is an essential course if you are a practising ecotoxicologist who has an interest in:

concentration-response (C-R) modelling

species sensitivity distributions (SSDs)

the Burrlioz software

ssdtools software

establishing guideline values

just learning about model averaging

Special deal

Course DescriptionAlthough model averaging is not a new concept (it dates back to 1963), its application to SSD modelling certainly is. In this context, model averaging (MA) is designed to help address a major conundrum in SSD modelling. And that is “what distribution do I use for the SSD?”. As noted by Fox and others, unlike some other branches of science where there is either a ‘natural’ distribution or some theoretical basis to help guide the choice, no such assistance is available in ecotoxicology. Coupled with this lack of guidance is the pathologically small sample sizes that we invariably use to fit SSDs and this results in the non-rejection of almost any plausible candidate distribution. This course will guide you through what can be a complex topic. We aim to do this in a natural, intuitive way rather than by formal instruction (although there’s a bit of that!). Commencing with a review of why the process of averaging is so important for so much of what we do in science and progressing to measures of goodness-of-fit (GoF) and the introduction of information theoretic measures such as entropy; Kullback-Liebler information; and Akaike’s Information Criterion (AIC). These concepts will be introduced and discussed in the context of their application to SSD modelling and modelling more generally. We will use R in a ‘hands-on’ mode to perform some of the basic calculations using likelihood methods to obtain weights for comparing alternative SSD models. You will also be introduced to generalized linear models using R as well as tools to assess the adequacy of the fit. From there we move on to putting the theory into practice with an emphasis on ‘learning by doing’. Initially, you will write your own functions in R to fit model-averaged SSDs and to use the fitted model to estimate HCx values. You will be shown ‘new’ techniques of developing and fitting mixture models to handle bimodal SSDs before finally moving on to the R package ssdtools and its on-line implementation shiny(ssdtools).

Special deal for first 20 SETAC AU members to enrolEnroll in the online course Model Averaging and receive a 25% discount and free course notes.There is no expiration to your access to course content and so you can undertake the course at your own pace – work through the notes, do the practice exercises, and test your knowledge with interactive quizzes. For those interested in having an on-going involvement in Model Averaging and SSD modelling, you can take out a student cloud subscription to access more advanced material, tools, and R code under the license ECOTOX.SCIENCE has with POSIT (formerly R Studio) for (USD)$5/month. This subscription will also allow you to write, run and store your R files on the POSIT cloud server, so you’ll always be in touch no matter where you are.

SETAC AU 2023 - EarlyBird Registration
2023-04-23 08:00 - 2023-06-16 17:00 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia

SETAC AU 2023 Abstract Submission
2023-04-23 08:00 - 2023-05-19 17:00 | Rydges Southbank Townsville, Queensland, 23 Palmer Street, Townsville, Queensland, 4810, Australia
