tesselle

tesselle is a collection of R packages for research and teaching in archaeology. These packages focus on quantitative analysis methods developed for archaeology. The tesselle packages are designed to work seamlessly together and to complement general-purpose and other specialized statistical packages. These packages can be used to explore and analyze common data types in archaeology: count data, compositional data and chronological data.

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alkahest

Pre-Processing XY Data from Experimental Methods

Project Status: Active – The project has reached a stable, usable state and is being actively developed.

A lightweight, dependency-free toolbox for pre-processing XY data from experimental methods (i.e. any signal that can be measured along a continuous variable). This package provides methods for baseline estimation and correction, smoothing, normalization, integration and peaks detection.

Documentation Source code

arkhe

Tools for Cleaning Rectangular Data

A collection of simple functions for cleaning rectangular data. This package allows to detect, count and replace values or delete rows/columns according to a specific predicate. In addition, it provides tools to check conditions and return informative error messages.

Documentation Source code

chronos

Archaeological Time Series

Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.

A toolkit for archaeological time series analysis. chronos provides a system of classes and methods to represent and work with archaeological time series. Dates are represented as rata die and can be converted to (virtualy) any calendar defined by Reingold and Dershowitz (2018)

Documentation Source code

dimensio

Multivariate Data Analysis

Simple Principal Components Analysis (PCA) and Correspondence Analysis (CA) based on the Singular Value Decomposition (SVD). This package provides S4 classes and methods to compute, extract, summarize and visualize results of multivariate data analysis. It also includes methods for partial bootstrap validation described in Greenacre (1984) and Lebart et al. (2006).

Documentation Source code

kairos

Analysis of Chronological Patterns from Archaeological Count Data

A toolkit for absolute dating and analysis of chronological patterns. kairos includes functions for chronological modeling and dating of archaeological assemblages from count data. It allows to compute time point estimates and density estimates of the occupation and duration of an archaeological site.

Documentation Source code

khroma

Colour Schemes for Scientific Data Visualization

Colour schemes ready for each type of data (qualitative, diverging or sequential), with colours that are distinct for all people, including colour-blind readers. This package provides an implementation of Paul Tol (2018) and Fabio Crameri (2018) colour schemes for use with graphics or ggplot2. It provides tools to simulate colour-blindness and to test how well the colours of any palette are identifiable. Several scientific thematic schemes (geologic timescale, land cover, FAO soils, etc.) are also implemented.

Documentation Source code

folio

Datasets for Teaching Archaeology and Paleontology

Datasets for teaching quantitative approaches and modeling in archaeology and paleontology. folio provides several types of data related to broad topics (cultural evolution, radiocarbon dating, paleoenvironments, etc.), which can be used to illustrate statistical methods in the classroom (multivariate data analysis, compositional data analysis, diversity measurement, etc.).

Documentation Source code

isopleuros

Ternary Plots

Ternary plots made simple. This package allows to create ternary plot using graphics. isopleuros provides functions to display the data in the ternary space, to add or tune graphical elements and to display statistical summaries. It also includes common ternary diagrams useful for the archaeologist (e.g. soil texture charts, ceramic phase diagram).

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nexus

Sourcing Archaeological Materials by Chemical Composition

Sourcing archaeological materials by chemical composition. nexus allows the exploration and analysis of compositional data in the framework of Aitchison (1986). It provides tools for chemical fingerprinting and source tracking of ancient materials.

Documentation Source code

tabula

Analysis and Visualization of Archaeological Count Data

An easy way to examine archaeological count data. tabula provides several tests and measures of diversity: heterogeneity and evenness (Brillouin, Shannon, Simpson, etc.), richness and rarefaction (Chao1, Chao2, ACE, ICE, etc.), turnover and similarity (Brainerd-Robinson, etc.). The package make it easy to visualize count data and statistical thresholds: rank vs. abundance plots, heatmaps, Ford and Bertin diagrams.

Documentation Source code