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A dataset is a collection of data, often in tabular or matrix form. This tag is NOT intended for data requests ("where can I find a dataset about ...") --> see OpenData

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Extracting data from a data frame with conditions

Given the first data frame consisting of 4 columns libId studId year freq 1000 3 2002 3 1000 34 2002 2 1000 52 2004 9 1001 17 2003 …
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