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Copper alloy classification according to Bayley & Butcher (2004)

copper_alloy_bb.Rd

Classification of copper alloy artefacts according to Bayley & Butcher (2004) based on Zn, Sn, and Pb concentrations in wt%. Concentrations must be given in wt%. Classification uses specific thresholds and ratios to define alloy types.

Usage

copper_alloy_bb(
  df,
  elements = c(Sn = "Sn", Zn = "Zn", Pb = "Pb"),
  id_sample = "ID"
)

Arguments

df

data frame with the data to be classified.

elements

named character vector with column names of Zn, Sn, and Pb concentrations.

id_sample

name of the column in df with the identifiers of each row. Default to ID.

Value

Original data frame with added column copper_alloy_bb.

References

Bayley, J. and Butcher, S. (2004). Roman brooches in Britain: a technological and typological study based on the Richborough Collection. London: Society of Antiquaries of London. https://doi.org/10.26530/20.500.12657/50365

Examples

sample_df <- data.frame(
  ID = 1:5,
  Sn = c(5, 1, 4, 0.5, 2),
  Zn = c(12, 20, 6, 2, 10),
  Pb = c(1, 0.5, 5, 9, 12)
)
copper_alloy_bb(sample_df)
#>   ID  Sn Zn   Pb   copper_alloy_bb
#> 1  1 5.0 12  1.0          Gunmetal
#> 2  2 1.0 20  0.5             Brass
#> 3  3 4.0  6  5.0 (Leaded) Gunmetal
#> 4  4 0.5  2  9.0     Leaded Copper
#> 5  5 2.0 10 12.0      Leaded Brass