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astrochron (version 0.4.3)

A Computational Tool for Astrochronology

Description

Routines for astrochronologic testing, astronomical time scale construction, and time series analysis. Also included are a range of statistical analysis and modeling routines that are relevant to time scale development and paleoclimate analysis.

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Version

Install

install.packages('astrochron')

Monthly Downloads

787

Version

0.4.3

License

GPL-3

Maintainer

Stephen Meyers

Last Published

July 1st, 2015

Functions in astrochron (0.4.3)

Divide by Linear Trend in Stratigraphic Series

Generate Autoregressive Moving-average Model

EXPERIMENTAL: Track ASM Null Hypothesis significance level minima in eASM results

Mann and Lees (1996) robust red noise MTM analysis

astrochron-package

astrochron: A Computational Tool for Astrochronology

Prewhiten Stratigraphic Series with Autoregressive Filter, Order Selected by Akaike Information Criterion

AR(1) + ETP simulation Routine

Apply 'ramping' sedimentation rate model to convert time to stratigraphy

Lowpass Filter Stratigraphic Series

Hilbert Transform of Stratigraphic Series

Create non-linear response by clipping stratigraphic series

Frequency-domain minimal tuning: Use interactive graphical interface and sorting to track frequency drift

Fit and Remove Lowess Smoother from Stratigraphic Series

Generate Eccentricity-Tilt-Precession Models

Interactively Identify Points in Plot

Determine the total power within a given bandwidth

Apply Cosine Taper to Stratigraphic Series

Prewhiten Stratigraphic Series with AR1 filter, using 'Standard' or Unbiased Estimate of rho

Simple Periodogram

Resample Stratigraphic Series

Identify minima of troughs in series, filter at desired threshold value

Dynamically explore cross-plot, zoom-in into specified region

Generate Harmonic Model

constantSedrate

Apply a constant sedimentation rate model to transform a spatial series to temporal series

Integrate sedimentation rate curve to obtain time-space map

Remove Outliers from Stratigraphic Series

Identify maxima of peaks in series, filter at desired threshold value

Apply DPSS Taper to Stratigraphic Series

Evolutive Harmonic Analysis

Log Transformation of Stratigraphic Series

Remove Gaussian Kernel Smoother from Stratigraphic Series

Summary Statistics for Stratigraphic Series

Create lithofacies rank series from bed thickness data

Multitaper Method Spectral Analysis

Read Data Matrix from File

Replace Values < 0 with 0

Create color time-frequency plots from eha results

Astrochronologic testing via the amplitude modulation approach of Zeeden et al. (2015).

Pad Stratigraphic Series with Zeros

Generate Cross-plot with Density Estimates on Axes

Tune stratigraphic series to an astronomical target using graphical interface

Apply Hann Taper to Stratigraphic Series

Generate phase-randomized surrogate series as in Ebisuzaki (1997)

Example stratigraphic model series

Ar/Ar Geochronology: Generate an Ar/Ar age spectrum and calculate step-heating plateau age.

Replace Values <= 0 with Smallest Positive Value

Write Tab-delimited File

Remove Missing Entries, Sort Data, Average Duplicates

Anchor a floating astrochronology to a radioisotopic age

List Column Numbers for Each Variable

Flip stratigraphic series

Standardize variable in Stratigraphic Series

Interactively Delete Points in Plot

Apply Gaussian Taper to Stratigraphic Series

EXPERIMENTAL: Evolutive Average Spectral Misfit

Frequency-domain minimal tuning: Use interactive graphical interface to trace frequency drift

Piecewise Linear Interpolation of Stratigraphic Series

Combine Multiple Vectors

Convert record of local spatial frequency (from EHA) to sedimentation rate curve

Isolate Data from a Specified Stratigraphic Interval

Extract record from EHA time-frequency output or eAsm output

Robust Locally-Weighted Regression Spectral Background Estimation

Tune Stratigraphic Series

Apply Taner Bandpass or Lowpass Filter to Stratigraphic Series

Read Data from File

Automatically plot multiple stratigraphic series, with smoothing if desired

Subtract Linear Trend from Stratigraphic Series

Query R for color information

Set default plotting parameters for vertical stratigraphic plots

Calculate all possible difference and combinations tones

Arcsine Transformation of Stratigraphic Series

Obliquity and Precession Periods of Berger et al. (1992)

Bandpass Filter Stratigraphic Series

Intermediate spectrum test of Thomson et al. (2001)

Remove Mean Value from Stratigraphic Series

Ar/Ar Geochronology: calculate weighted mean age, age uncertainty, and other associated statistics/plots (with interactive graphics for data culling).

Generate AR(1) surrogates

Average Spectral Misfit

Download Laskar et al. (2004, 2011a, 2011b) astronomical solutions

Remove Outliers from Stratigraphic Series