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Statistics for eDiscovery: Random Sample Generation and eDiscovery
How do I generate a random sample?
In election polling, it is quite a challenge to generate a truly unbiased random sample. Not everyone who will vote has a telephone, not everyone is willing to answer, not everyone is truthful. Sampling documents is a little easier, because they don’t have a choice in whether they respond or not. The most practical way to generate a random sample is to use a random number generator. Spreadsheet programs, such as Excel, have random number generators built in. If you have, say ten thousand documents, from which you want a sample of 400, then you could generate 400 random numbers in the interval of 1 to 10,000. You need to be careful to prevent the same number appearing twice. Technically, the numbers generated by a random number generator are pseudo- random numbers, but for our purposes, they are good enough. They are pseudo-random in that eventually they will repeat, but unless you are dealing with extremely large samples, the repetition is unlikely to be encountered. These pseudo-random number generators are used in practically all slot machines, for example.
Source: Statistics For eDiscovery (PDF) - Used by Permission of Herbert L. Roitblat, Ph.D.
Series: Statistics for eDiscovery – Blog Posts – Orange Legal Technologies.
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