Sourcing Archaeological Materials by Chemical Composition
Grouped Data
Missing Values Replacement
Zero-Replacement
Scalar Product
Scaling and Centering of Compositional Data
Extract or Replace Parts of an Object
Matrix Transpose
Row Sums
Additive Log-Ratios (ALR)
Graph of Log-ratios
Grouping Metadata
Compute Summary Statistics of Data Subsets
Operations in the Simplex
Coerce to Amounts
Coerce to a Closed Compositional Matrix
Coerce to a Data Frame
Barplot of Compositional Data
Combine Two Composition Matrices
Chemical Elements and Oxides
Closure Operation
Sample Quantiles
Compositional Matrix
Compositional Mean of Data Subsets
Covariance Matrix
Data Description
Outlier Detection
Distances
Geometric Mean
Divide into Groups
Group-based Subset
Working With Groups
Grouped Compositional Matrix
Grouped Log-Ratio Matrix
Objects exported from other packages
Histogram of Compositional Data
Log-Ratio Matrix
Mahalanobis Distance
Marginal Compositions
Compositional Mean
Missing Values Policy
Mixed-Mode Analysis
Get or Set Parts of an Object
nexus: Sourcing Archaeological Materials by Chemical Composition
Numeric Matrix
Outliers
Plot Compositional Data
Principal Components Analysis
Perturbation Operation
Proportionality Index of Parts (PIP)
Plot Outliers
Plot Log-Ratios
Powering Operation
Centered Log-Ratios (CLR)
Isometric Log-Ratios (ILR)
Inverse Log-Ratio Transformation
Pairwise Log-Ratios (LR)
Pivot Log-Ratios (PLR)
Univariate Isometric Log-Ratios (ILR)
Total Variance
Log-Ratios Variances
Variation Matrix
Exploration and analysis of compositional data in the framework of Aitchison (1986, ISBN: 978-94-010-8324-9). This package provides tools for chemical fingerprinting and source tracking of ancient materials.
Useful links