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Samples are generated to:

Systematic from random start: From the j'th observation in the initial table, an observation is extracted every k observations to be used in the sample. j is chosen at random from among a number of possibilities depending on the size of the initial table and the size of the final sample. k is determined such that the observations extracted are as spaced out as possible

N every s starting at k: The sample is built extracting N rows, every s rows, starting at row k

Random without replacement: Observations are chosen at random and may occur only once in the sample
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