120 115 130 140 100 98 150 156 90 90
	Data Entry The data is a matrix of numbers with multiple columns     - Each row a subject     - Each column a particular instrument of measurement     - Each cell the value of that measurement (col) for that subject(row)

Portney LG & Watkins MP (2000) Foundations of clinical research Applications to practice. Prentice Hall Inc. New Jersey ISBN 0-8385-2695-0 p 560-567