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astrochron (version 0.8)

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

755

Version

0.8

License

GPL-3

Maintainer

Stephen Meyers

Last Published

May 16th, 2018

Functions in astrochron (0.8)

constantSedrate

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

Multitaper Method Spectral Analysis with Power Law (1/f) fit

Prewhiten stratigraphic series with autoregressive filter, order selected by Akaike Information Criterion

Evolutive Harmonic Analysis & Evolutive Power Spectral Analysis

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

Adjust spectrum confidence levels for multiple comparisons

Generate eccentricity-tilt-precession models

'Dynamic window' moving average, median and variance of stratigraphic series

Example stratigraphic model series

Arcsine transformation of stratigraphic series

Create non-linear response by clipping stratigraphic series

Prewhiten stratigraphic series with AR1 filter, using 'standard' or unbiased estimate of rho

Read data matrix from file

Calculate all possible difference and combinations tones

Replace values < 0 with 0

Monte Carlo simulation for TimeOpt

Summary statistics for stratigraphic series

Determine 'dynamic moving window' for stratigraphic series, adjusting for changing sample density to maintain a window of constant duration

Download file from astrochron data server

Generate noise surrogates from a theoretical power spectrum

Track ASM null hypothesis significance level minima in eASM results

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

Apply Hann taper to stratigraphic series

Mann and Lees (1996) robust red noise MTM analysis

Isolate data from a specified stratigraphic interval

Multitaper method spectral analysis

Intermediate spectrum test of Thomson et al. (2001)

Calculate eccentricity and precession periods in ka, given g and k in arcsec/yr

Set default plotting parameters for vertical stratigraphic plots

Identify optimal spatial/temporal shift to maximize correlation between two stratigraphic series.

TimeOptMCMC: Evaluation of eccentricity-related amplitude modulation and bundling in paleoclimate data ("TimeOpt"), with uncertainties via Markov-Chain Monte Carlo

Simple periodogram

Interactively identify points in plot

Apply cosine taper to stratigraphic series

Hilbert transform of stratigraphic series

Apply DPSS taper to stratigraphic series

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

Tune stratigraphic series to an astronomical target using graphical interface

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

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

Pad stratigraphic series with zeros

Combine multiple vectors

Piecewise linear interpolation of stratigraphic series

Divide by linear trend in stratigraphic series

Extract record from EHA time-frequency output or eAsm output

Remove outliers from stratigraphic series

Replace values <= 0 with smallest positive value

Adjust spectral p-values for multiple comparisons

Lowpass filter stratigraphic series

Flip stratigraphic series

Create color time-frequency plots from eha results.

Generate cross-plot with kernel density estimates on axes

Remove missing entries, sort data, average duplicates

Remove outliers from stratigraphic series

Resample stratigraphic series

TimeOpt: Evaluation of eccentricity-related amplitude modulation and bundling in paleoclimate data

Determine the total power within a given bandwidth

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

Write tab-delimited file

Apply Gaussian taper to stratigraphic series

Log transformation of stratigraphic series

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

Remove stratigraphic levels that contain one or more NAs

Generate power law (1/f) noise surrogates

Robust Locally-Weighted Regression Spectral Background Estimation

A tool to interactively trace peak trajectories on plots

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

Apply Taner bandpass or lowpass filter to stratigraphic series

Create lithofacies rank series from bed thickness data

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

Calculate moving window correlation coefficient for two stratigraphic series, using a 'dynamic window'

Standardize variable in stratigraphic series

Read data from file

TimeOptPlot: Generate summary figure for TimeOpt analyses

Remove Gaussian kernel smoother from stratigraphic series

Evaluate power spectrum false positive rates via Monte Carlo simulation

Tune stratigraphic series

Fit and remove Lowess smoother from stratigraphic series

Estimate power law (1/f) fit to power spectrum

Integrate sedimentation rate curve to obtain time-space map

Estimate correlation coefficient and significance for serially correlated data

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

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

A tool to interactively select points to track peak trajectories on plots

AR(1) + ETP simulation routine

Automatically plot multiple stratigraphic series, with smoothing if desired

Anchor a floating astrochronology to a radioisotopic age

Obliquity and precession periods of Berger et al. (1992)

Generate AR(1) surrogates

Remove mean value from stratigraphic series

Average Spectral Misfit

Bandpass filter stratigraphic series

Generate autoregressive moving-average model

astrochron-package

astrochron: A Computational Tool for Astrochronology

Interactively delete points in plot

Generate harmonic model

Subtract linear trend from stratigraphic series

List column numbers for each variable

Query R for color information

Evolutive Average Spectral Misfit

eTimeOpt: Evolutive implementation of TimeOpt (Meyers, 2015)

Track eTimeOpt r2 maxima

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