Learn R Programming

⚠️There's a newer version (1.5) of this package.Take me there.

astrochron (version 0.4.1)

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.

Copy Link

Version

Install

install.packages('astrochron')

Monthly Downloads

593

Version

0.4.1

License

GPL-3

Maintainer

Stephen Meyers

Last Published

March 17th, 2015

Functions in astrochron (0.4.1)

Evolutive Harmonic Analysis

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

Apply Hann Taper to Stratigraphic Series

EXPERIMENTAL: Evolutive Average Spectral Misfit

Standardize variable in Stratigraphic Series

Apply DPSS Taper to Stratigraphic Series

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

Read Data Matrix from File

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

Isolate Data from a Specified Stratigraphic Interval

Robust Locally-Weighted Regression Spectral Background Estimation

Multitaper Method Spectral Analysis

Extract record from EHA time-frequency output or eAsm output

Log Transformation of Stratigraphic Series

Remove Mean Value from Stratigraphic Series

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

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

Lowpass Filter Stratigraphic Series

Query R for color information

Automatically plot stratigraphic series, with smoothing if desired

astrochron-package

astrochron: A Computational Tool for Astrochronology

AR(1) + ETP simulation Routine

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

Replace Values < 0 with 0

Remove Outliers from Stratigraphic Series

Remove Missing Entries, Sort Data, Average Duplicates

Create non-linear response by clipping stratigraphic series

Remove Gaussian Kernel Smoother from Stratigraphic Series

Replace Values <= 0 with Smallest Positive Value

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

Average Spectral Misfit

Piecewise Linear Interpolation of Stratigraphic Series

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

Integrate sedimentation rate curve to obtain time-space map

Set default plotting parameters for vertical stratigraphic plots

Remove Outliers from Stratigraphic Series

Simple Periodogram

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

Example stratigraphic model series

Summary Statistics for Stratigraphic Series

List Column Numbers for Each Variable

Determine the total power within a given bandwidth

Hilbert Transform of Stratigraphic Series

Resample Stratigraphic Series

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

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

Apply Gaussian Taper to Stratigraphic Series

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

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

Apply Taner Bandpass or Lowpass Filter to Stratigraphic Series

constantSedrate

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

Tune Stratigraphic Series

Generate Cross-plot with Density Estimates on Axes

Create color time-frequency plots from eha results

Tune stratigraphic series to an astronomical target using graphical interface

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

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

Anchor a floating astrochronology to a radioisotopic age

Apply Cosine Taper to Stratigraphic Series

Generate Autoregressive Moving-average Model

Interactively Delete Points in Plot

Generate Harmonic Model

Combine Multiple Vectors

Write Tab-delimited File

Generate AR(1) surrogates

Subtract Linear Trend from Stratigraphic Series

Bandpass Filter Stratigraphic Series

Generate Eccentricity-Tilt-Precession Models

Fit and Remove Lowess Smoother from Stratigraphic Series

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

Arcsine Transformation of Stratigraphic Series

Create lithofacies rank series from bed thickness data

Calculate all possible difference and combinations tones

Flip stratigraphic series

Interactively Identify Points in Plot

Divide by Linear Trend in Stratigraphic Series

Intermediate spectrum test of Thomson et al. (2001)

Mann and Lees (1996) robust red noise MTM analysis

Pad Stratigraphic Series with Zeros

Read Data from File