Filter data.frame rows by a logical condition

rr-faqdataframesubset
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Count number of rows within each group

rr-faqdataframeaggregate
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Quickly reading very large tables as dataframes

rr-faqdataframeimport
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?

pythonpandasgroup-bypandas-groupbydataframe
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Import multiple csv files into pandas and concatenate into one DataFrame

pythonpandasconcatenationdataframecsv
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