In an analysis where each row contains e.g. a flight number, I'd like to filter down my active dataset to keep only the three most-delayed flight numbers for each carrier.
How do I accomplish this in Contour?
In Contour, how do I filter down to the top N by values in a group?
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This is a two-step process: (1) Group and order, and (2) filter.
Group and Order: Add an Expression board, and make a new column by assigning a row number for each record. Reset the row number within each carrier group, and ensure that row numbers are assigned in order of flight delay duration.
Filter: Add a Filter board and select those row numbers created above that are less than or equal to 3 to keep only the three most delayed flights for each carrier.