A Computational Tool for Astrochronology
Calculate geochemical proxy accumulation rates
Anchor a floating astrochronology to a radioisotopic age
Generate AR(1) surrogates
AR(1) + ETP simulation routine
Arcsine transformation of stratigraphic series
Generate autoregressive moving-average model
Average Spectral Misfit
astrochron: A Computational Tool for Astrochronology
Automatically plot multiple stratigraphic series, with smoothing if de...
Bandpass filter stratigraphic series
Obliquity and precession periods of Berger et al. (1992)
bicoherence: Calculate bispectrum and bicoherence using WOSA method as...
Bioturbate time series using diffusion model from Guinasso and Schinck...
Calculate eccentricity, obliquity and precession periods in ka, given ...
Combine multiple vectors
Create non-linear response by clipping stratigraphic series
Adjust spectrum confidence levels for multiple comparisons
Apply a constant sedimentation rate model to transform a spatial serie...
Convolution through Fast Fourier Transform
Apply cosine taper to stratigraphic series
Generate harmonic model
Wiener Deconvolution through Fast Fourier Transform
Interactively delete points in plot
Remove mean value from stratigraphic series
Subtract linear trend from stratigraphic series
Model differential accumulation
Divide by linear trend in stratigraphic series
Apply DPSS taper to stratigraphic series
Evolutive Average Spectral Misfit
Track ASM null hypothesis significance level minima in eASM results
Evolutive Harmonic Analysis & Evolutive Power Spectral Analysis
eTimeOpt: Evolutive implementation of TimeOpt (Meyers, 2015; Meyers, 2...
Track eTimeOpt r2 maxima
Generate eccentricity-tilt-precession models
Extract record from EHA time-frequency output or eAsm output
Flip stratigraphic series
Convert record of local spatial frequency (from EHA) to sedimentation ...
Apply Gaussian taper to stratigraphic series
Query R for color information
Download file from astrochron data server
Download Laskar et al. (2004, 2011a, 2011b) astronomical solutions
Apply Hann taper to stratigraphic series
List column numbers for each variable
Hilbert transform of stratigraphic series
Interactively identify points in plot
Imbrie and Imbrie (1980) ice sheet model
Impulse response function calculation
insolation difference map using Laskar et al. (2004) insolation calcul...
generate an insolation map using Laskar et al. (2004) insolation calcu...
Laskar et al. (2004) insolation calculations
Determine the total power within a given bandwidth
Isolate data from a specified stratigraphic interval
Tune stratigraphic series to an astronomical target using graphical in...
Piecewise linear interpolation of stratigraphic series
Piecewise linear interpolation of stratigraphic series using the appro...
Log transformation of stratigraphic series
Lowpass filter stratigraphic series
Robust Locally-Weighted Regression Spectral Background Estimation
Generate noise surrogates from a theoretical power spectrum
Multitaper method spectral analysis
Intermediate spectrum test of Thomson et al. (2001)
Mann and Lees (1996) robust red noise MTM analysis
Multitaper Method Spectral Analysis with Power Law (1/f) fit
Adjust spectral p-values for multiple comparisons
Calculate moving window correlation coefficient for two stratigraphic ...
Determine 'dynamic moving window' for stratigraphic series, adjusting ...
Determine 'dynamic moving window' for stratigraphic series, adjusting ...
'Dynamic window' moving assessment of maxima and minima in stratigraph...
'Dynamic window' moving average, median and variance of stratigraphic ...
'Dynamic window' moving average, median and variance of stratigraphic ...
Remove Gaussian kernel smoother from stratigraphic series
Fit and remove Lowess smoother from stratigraphic series
Pad stratigraphic series with zeros
Identify maxima of peaks in series, filter at desired threshold value
Simple periodogram
Set up plots
Create color time-frequency plots from eha results.
Set default plotting parameters for vertical stratigraphic plots
Prewhiten stratigraphic series with autoregressive filter, order selec...
Prewhiten stratigraphic series with AR1 filter, using 'standard' or un...
Generate power law (1/f) noise surrogates
Estimate power law (1/f) fit to power spectrum
Create lithofacies rank series from bed thickness data
Read data from file
Read data matrix from file
Replace values < 0 with 0
Replace values <= 0 with smallest positive value
Resample stratigraphic series
Remove stratigraphic levels that contain one or more NAs
Standardize variable in stratigraphic series
Apply 'ramping' sedimentation rate model to convert time to stratigrap...
Integrate sedimentation rate curve to obtain time-space map
Identify optimal spatial/temporal shift to maximize correlation betwee...
Remove missing entries, sort data, average duplicates
Ar/Ar Geochronology: Generate an Ar/Ar age spectrum and calculate step...
Principal Component Analysis on Stratigraphic Series
Summary statistics for stratigraphic series
Estimate correlation coefficient and significance for serially correla...
Generate phase-randomized surrogate series as in Ebisuzaki (1997)
Synthesize stratigraphy from forcing function
Apply Taner bandpass or lowpass filter to stratigraphic series
Apply Taner bandpass or lowpass filter to Fourier coefficients
Evaluate power spectrum false positive rates via Monte Carlo simulatio...
Astrochronologic testing via the precession amplitude modulation appro...
Astrochronologic testing via the obliquity amplitude modulation approa...
TimeOpt: Evaluation of eccentricity-related amplitude modulation and b...
TimeOptMCMC: Evaluation of eccentricity-related amplitude modulation a...
TimeOptPlot: Generate summary figure for TimeOpt analyses
Monte Carlo simulation for TimeOpt
Monte Carlo simulation for TimeOpt, using power law (1/f) noise
TimeOpt analysis using variable sedimentation models
TimeOptTemplatePlot: Generate summary figure for TimeOptTemplate analy...
Simulations for timeOptTemplate
Calculate all possible difference and combinations tones
Frequency-domain minimal tuning: Use interactive graphical interface t...
A tool to interactively trace peak trajectories on plots
Frequency-domain minimal tuning: Use interactive graphical interface a...
A tool to interactively select points to track peak trajectories on pl...
Remove outliers from stratigraphic series
Remove outliers from stratigraphic series
Identify minima of troughs in series, filter at desired threshold valu...
Tune stratigraphic series
Bioturbation removal function following the approach of Liu et al (202...
Write CSV file
Write tab-delimited file
Ar/Ar Geochronology: calculate weighted mean age, age uncertainty, and...
Generate cross-plot with kernel density estimates on axes
Dynamically explore cross-plot, zoom-in into specified region
Routines for astrochronologic testing, astronomical time scale construction, and time series analysis <doi:10.1016/j.earscirev.2018.11.015>. Also included are a range of statistical analysis and modeling routines that are relevant to time scale development and paleoclimate analysis.