Regarding the computation of measures in a data cube: (a) Enumerate three categories of measures, based on the kind of aggregate functions used in com- puting a data cube. (b) For a data cube with the three dimensions time, location, and item, which category does the function variance belong to? Describe how to compute it if the cube is partitioned into many chunks. Hint: The formula for computing variance is Σ( - )², where F, is the average of 1,s. (c) Suppose the function is "top 10 sales." Discuss how to efficiently compute this measure in a data cube.

Regarding the computation of measures in a data cube: (a) Enumerate three categories of measures, based on the kind of aggregate functions used in com- puting a data cube. (b) For a data cube with the three dimensions time, location, and item, which category does the function variance belong to? Describe how to compute it if the cube is partitioned into many chunks. Hint: The formula for computing variance is Σ( - )², where F, is the average of 1,s. (c) Suppose the function is "top 10 sales." Discuss how to efficiently compute this measure in a data cube.

Operations Research : Applications and Algorithms

4th Edition

ISBN:9780534380588

Author:Wayne L. Winston

Publisher:Wayne L. Winston

Chapter21: Simulation

Section21.5: Simulations With Continuous Random Variables

Problem 4P

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