modeling

Credit: Pixabay/CC0 Public Domain Are e-scooters just the first sign of a shared-mobility revolution? If they are, then researchers at the University of Arizona intend to make sure that the emerging transportation system has functional models on par with other modes of transportation. In 2018,…

Building MMM models using tree-based ensembles and explaining media channel performance using SHAP (Shapley Additive Explanations)Photo by Adrien Converse on UnsplashThere are many ways one can build a marketing mix model (MMM) but usually, it boils down to using linear regression for its simple interpretability. Interpretability of more complex non-linear models is the topic of research in the last 5–6 years since such concepts as LIME or SHAP were proposed in the machine learning community to explain the output of a…

The most important, overlooked, and predictable regression model.Linear Regression Image — By AuthorLinear regression is a simple, yet powerful tool that should be in every data scientist’s back pocket. In this article, I will use a real-world example to showcase the power of linear regression on real-world data.CalCOFI DatasetWe are going to be working with the CalCOFI Dataset. This dataset contains comprehensive oceanographic measurement data from California from 1949 up to the present day. The dataset includes features…

Credit: Pixabay/CC0 Public Domain Researchers from the School of Earth Sciences at The University of Western Australia have helped reconstruct the cycle of carbon in the Earth using thermodynamic modeling and plate tectonic reconstructions dating back 250 million years. …

When something's messing with your insides and you feel like you're going to hurl, the last thing you probably want to do is eat.Deer, caribou, and other ungulates (hoofed animals) experience a similar problem when infected by non-deadly parasites. It utterly sucks for them, but it turns out infections that put them off their food have a wider benefit for the ecosystem.  "Parasites are well known for their negative impacts on the physiology and behavior of individual hosts and host populations, but these effects are…

Effect of global change and the induced biocrust cover loss estimated by 2070 on future dust cycling. a–d, Change in future total annual dust emission (a), total annual dust deposition (b), mean annual atmospheric dust burden (c) and mean annual aerosol net radiative effect at the top of the atmosphere (d). Data calculated according to RCP 2.6. Individual maps showing biocrust effects on dust cycling according to RCP 4.5 and RCP 8.5 are shown in…

Experimental evidence on starling flocks. a The equal-time space correlation function of the speed fluctuations (for the definition of the correlation function see the “Methods” section), plotted against the distance r between the birds rescaled by the flock’s size L, for some typical flocks (each color corresponds to a different flock); the fact that all the curves collapse onto each other indicates that the spatial range of the speed correlation,…

Climate modeling published in Nature: Communications Earth and Environment demonstrate widespread increases in the occurrences of flash flooding events across most of the United States. Credit: Joe Lawton/NOAA/NSSL The latest U.N. report on climate change documented researchers' efforts that have shown some measures of global warming are now unavoidable, and current research efforts are focusing on mitigation and adaptation…