In the same vein, condensed-matter physicists have the Ising model. The German physicist Ernst Ising created the Ising model in 1924 following a suggestion by his PhD supervisor Wilhelm Lenz.

Furthermore, to assess the sensitivity of study results to classification of healthy retirees, we repeated the analyses using two more broad definitions of healthy retirees. Initially, we categorised ...

Statistical analysis showed the proposed solution has an average misclassification error of only 1.5% ...