The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

Measuring Quantum noise has been challenge. What could theoretically take 20 million years to measure now only takes minutes.

This is a preview. Log in through your library . Abstract Measuring the physical activity of persons with chronic and disabling conditions presents complexities related to measuring instruments, the ...

Those of us in the business of psychological measurement use the terms reliability and validity a lot. You've probably seen those terms on the Psychology Today website (they appear thousands of times) ...

Quality of Life Research, Vol. 18, No. 7 (Sep., 2009), pp. 873-880 (8 pages) Background The use of global health items permits an efficient way of gathering general perceptions of health. These items ...