| filter_sites | R Documentation | 
Filter down to sites with num_years of data
filter_sites(
  x,
  parameter_cd = "72019",
  num_years = NA,
  start_year = NA,
  end_year = NA
)
x | 
 aquifer data  | 
parameter_cd | 
 character, 5-digit parameter code, default is "72019".  | 
num_years | 
 integer number of years required. This can be
  | 
start_year | 
 integer the first year to filter from. If   | 
end_year | 
 integer the last year to filter from. If   | 
data frame filter of x
aquifer_data <- aquifer_data
num_years <- 30
aq_data <- filter_sites(aquifer_data,
                        parameter_cd = "72019",
                        num_years = num_years)
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