classification

We combined four machine learning techniques and four data preprocessing for class imbalance to identify the outperforming strategy to screen articles in PubMed for inclusion in systematic reviews. We used textual data of 14 systematic reviews as case studies. Meta-analytic fixed-effect models were used to pool delta AUCs separately by classifier and strategy. Resampling techniques slightly improved the performance of the investigated machine learning techniques. From a computational perspective, random undersampling 35:65 may be preferred.

Five-hundred Random Forests were trained on a set of bootstrap samples of the whole dataset (1789 ED visits) to perform the classification task. MLTs seemed to be a promising opportunity for the exploitation of unstructured information reported in ED records in low- and middle-income Spanish-speaking countries.