When: Thursday 15th March 2018, 13:00-14:00.
Included in meeting:
The fortnightly BRAG meeting will be held tomorrow 15/03/18 at 1pm in room Y801. This week we will have presentations by Brigitte and Jessie.
Title: Effect of spatial aggregation on prediction accuracy of green biomass using Boosted Regression Trees
Abstract: Raster processing is computationally expensive. We are investigating in the effect of four spatial scales and spatial aggregation scheme to reduce data volume and complexity to predict naturally existing green biomass using fractional cover (FCover) imagery with geographic centroids coordinates. Our response variable is an aggregated FCover mean extracted out of an even spaced spatial grid that has been overlaid on the FCover scene. In my talk, I will introduce our approach of how the data reduction scheme has been conducted and what accuracy we received in all the four spatial scales. I will show residual plots as measurement of dispersion on the predicted outcome and visualisations like Relative Influence, Partial Dependency Plots and Marginal Plots that further allow us to the get in-depth knowledge in the variable interaction. For this study, mostly two R packages have been used (caret and gbm). Lastly, I will sum up my finding and their meaning to real world problems.
Title: Communication of Statistical Uncertainty to non-expert audiences
Abstract: This short presentation will look at uncertainty communication to non-expert audiences in the context of Cancer Mapping and discusses; what is uncertainty, how is it presented in cancer maps, and the outcomes of an online game that explores how uncertainty communication influences players behaviour.
We look forward to seeing you all there!
Farzana and Trish