Concentration units basic concepts

D. R. Cox, P/anning of Experiments,]ohxi Wiley Sons, Inc., New York, 1958. This book provides a simple survey of the principles of experimental design and of some of the most usehil experimental schemes. It tries "as far as possible, to avoid statistical and mathematical technicalities and to concentrate on a treatment that will be intuitively acceptable to the experimental worker, for whom the book is primarily intended." As a result, the book emphasizes basic concepts rather than calculations or technical details. Chapters are devoted to such topics as "Some key assumptions," "Randomization," and "Choice of units, treatments, and observations."... 

To illustrate the basic concepts, let us consider an example, altered from Bozarth and Handheld (2006). Assume that MeltoMatic Company manufactures and distributes snow blowers. Sales of MeltoMatic snow blowers are concentrated in the midwestern and northeastern states of the United States. Thus, the company has distribution centers (DCs) located in Minneapolis and Buffalo, both of which are supplied by MeltoMatic s manufacturing plant in Cleveland. Table 3.4 shows the DRP records for the Minneapolis and Buffalo DCs for MeltoMatic s two SKUs, Model SB-15 and Model SBX-25. The first three lines in the table sections devoted to each SKU at each DC provide the forecasted demand (requirements), D, the scheduled receipts, SR, already expected to arrive in future periods and the projected ending inventory in each period, C This last quantity. If, is computed on a period-by-period basis as follows ... 

The study of computer architecture amounts to analyzing two basic principles, performance and cost for a set of computer architecture alternatives that meet functionality requirements. This appears to be straightforward when considered at a general level, but when these topics are looked at in detail the water can become muddy. If a systematic approach is used the concepts can be straightforward. Fortunately, central processing units, memory hierarchy, I/O systems, etc., are layered, and these layers may be considered as levels of abstractions. Each level of abstraction has its own abstractions and objects. By studying aspects of computer science in this fashion, it is possible to censor out details that are irrelevant to the level of abstraction being considered and to concentrate on the task at hand. 

---