Title: User Sampling Methods

Essay Details

Subject: Technology
Author: Becky S
Date: June 4, 2014
Level: University
Grade: A
Length: 5 / 1399
No of views: 0
Essay rating: good 0, average 0, bad 0 (total score: 0)

Essay text:

There are dozens of methods of selecting members, using a variety of mathematical techniques, but the key is that each subject has a random, calculable chance of being selected. There is no human intervention involved in the selection. Method Characteristics Simple (random) Sampling The sample is selected entirely at random Stratified The population is first divided in to exclusive subgroups based on some predetermined criteria (e...

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location), then samples are selected at random Proportionate Stratified As above, but a smaller group that would otherwise not provide statistically valid results may be oversampled then the results weighted to correct for this. For example, if a particular group is too small to provide a statistically significant sample, more members of that group would be sampled Clustering The starting point for the sample is randomised, then assumes that the sample at that point is representative of the region...

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