Description Usage Arguments Details Value
Read in a list of different years' accident files, add year info as a column for each data frame, and choose MONTH and year columns for futher analysis, if the input of year is invalid, it will give a message and return no result.
1 | fars_read_years(years)
|
years |
A list of numeric values standing for years |
If years is not invalid number for years, a warning will be issused.
A list of data frames with two columns in each of them, MONTH and year
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