Package index

ASTR objects

Functions for creating and handling ASTR objects.

as_ASTR() read_ASTR() validate() format(<ASTR>) print(<ASTR>) get_contextual_columns() get_analytical_columns() get_isotope_columns() get_element_columns() get_ratio_columns() get_concentration_columns() get_error_columns() get_unit_columns() remove_units() unify_concentration_unit()

ASTR Schema implementation

rel_to_abs() abs_to_rel()

Convert between relative and absolute analytical uncertainties

bdl_strategy_none() bdl_strategy_default() bdl_strategy_negative()

Strategies to replace "below detection limit" values in as_ASTR(), and read_ASTR() with the bdl_strategy argument

Data subsetting

Pre-compiled lists for easier subsetting of data

isotopes_data

Isotopes

elements_data

Chemical elements

oxides_data

Oxides

special_oxide_states

Special oxide states

Unit conversions

Functions and data tables for conversions between untis not covered in {units}

wt_to_at() at_to_wt()

Conversion between wt% and at%

element_to_oxide() oxide_to_element()

Oxide conversion functions

conversion_oxides

Conversion factors from oxides to elements

Calculations, Classifications, Statistics

Functions for data transformation

copper_alloy_bb()

Copper alloy classification according to Bayley & Butcher (2004)

copper_alloy_pollard()

Copper alloy classification according to Pollard et al. (2015).

copper_group_bray()

Copper classification according to Bray et al. (2015)

pb_iso_age_model() stacey_kramers_1975() cumming_richards_1975() albarede_juteau_1984()

Calculate lead isotope age models

amalia()

AMALIA algorithm for matching of sample and reference lead isotope data

pointcloud_distribution()

Comparing isotope samples to reference data in 3D space

Visualisation

Functions for plotting data

geom_kde2d()

Draw 2D kernel density estimate polygons by quantiles

geom_sk_lines() geom_sk_labels()

Lead Evolution Geom for Stacey & Kramers (1975)

Data

Datasets included in the package

ArgentinaDatabase

Lead isotope data from Argentina

GlobaLID_ASTR

GlobaLID lead isotope database

tel_dor

LIA points of silver hoard from Tell Dor (Israel)

Machine Learning & Provenance Analsis

ML classifier training, and proveanceing of samples using eucldian distance and ML probalities.

as_pbiso_ref_data()

Create reference data object for LIA endmember distance and probability estimation functions. Data preprocessing and cleaning ensure the reliability and accuracy of provenance analysis. This step results in the removal of all NA values from the selected isotope tables and groups. The step should also exclude groups with a low number samples (in the case of Shnyr et al. (2026), this was 5).

pb_iso_train_data()

Train XGBoost model

pb_iso_prov_predict()

Predict isotope provenance

pb_iso_prov_dist() euc_dist() mf_dist()

Euclidean distance for Pb isotope ratios to ore sources

pb_iso_endmembers()

Find endmembers from a list of lead isotope data points.