1. The Pearson Correlation By far the most common correlation is the Pearson correlation (or the Pearson productâmoment correlation) which measures the degree of straight-line relationship. D e f i n i t i o n The Pearson correlation measures the degree and the direction of the linearrelationship between two variables.
A core is usually the basic computation unit of the CPU-it can run a single program context (or multiple ones if it supports HW threads such as hyperthreading on intel CPUs), maintaining the correct program state, registers, and correct execution order, and performing the operations through ALUs.
Since 2005, computer CPU chip makers have increasingly adopted the use of multiple cores to increase performance. Each core runs a separate computing task, so the computer gets more work done. Before the rush to multi-core CPUs, computer designers sometimes put two, four or more single-core CPUs into a system.