For an interactive learning experience, check out the Choose a Light Guide. 1  Light Bulb Purchasing Guide (PDF, 652 KB) 2  ENERGY STAR certified bulbs use less power (watts) than incandescent bulbs. 3  ENERGY STAR certified bulbs are available in a variety of shades. 4  Not all ENERGY STAR certified bulbs are dimmable.
Coefficient of variation. Not to be confused with Coefficient of determination. In probability theory and statistics, the coefficient of variation (CV), also known as relative standard deviation (RSD), is a standardized measure of dispersion of a probability distribution or frequency distribution.
A direct-access storage device ( DASD ) pronounced ) is a secondary storage device in which each physical record has a discrete location and a unique address. IBM developed DASDs for use with mainframe computers and some minicomputers . Disk drives , magnetic drums , data cells and optical disc drives are all classified as DASDs.