The data returned from
covidcast_signals() can, if
called with the
issues argument, contain multiple issues for a single
observation in a single location. These functions filter the data frame to
contain only the earliest issue or only the latest issue.
1 2 3
A data frame in the same form, but with only the earliest or latest issue of every observation. Note that these functions sort the data frame as part of their filtering, so the output data frame rows may be in a different order.
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