The collection of variance-covariance matrices for any linear model may be represented, without altering relationships among linear unbiased estimators, as a compact convex subset of nonnegative ...

The newest version of ChatGPT consumes significantly more energy than previous models, with academics working to quantify the environmental impact due to a lack of transparency from AI companies.

Primary and secondary outcome measures The primary outcome was tracheal injury score, assessed via fibreoptic bronchoscopy for hyperaemia, ischaemia, ulcers and perforation. Lesions were classified as ...