Adjust spectrum confidence levels for multiple comparisons
Apply a constant sedimentation rate model to transform a spatial series to temporal series
Wiener Deconvolution through Fast Fourier Transform
Bioturbate time series using diffusion model from Guinasso and Schinck (1975), as in Liu et al. (2021)
Subtract linear trend from stratigraphic series
Track ASM null hypothesis significance level minima in eASM results
eTimeOpt: Evolutive implementation of TimeOpt (Meyers, 2015; Meyers, 2019)
Remove mean value from stratigraphic series
Generate harmonic model
Apply DPSS taper to stratigraphic series
Convolution through Fast Fourier Transform
Track eTimeOpt r2 maxima
Apply cosine taper to stratigraphic series
Evolutive Average Spectral Misfit
Download file from astrochron data server
Model differential accumulation
Divide by linear trend in stratigraphic series
Apply Gaussian taper to stratigraphic series
Evolutive Harmonic Analysis & Evolutive Power Spectral Analysis
Convert record of local spatial frequency (from EHA) to sedimentation rate curve
insolation difference map using Laskar et al. (2004) insolation calculations
Flip stratigraphic series
List column numbers for each variable
Query R for color information
Apply Hann taper to stratigraphic series
Tune stratigraphic series to an astronomical target using graphical interface
Interactively delete points in plot
Isolate data from a specified stratigraphic interval
Hilbert transform of stratigraphic series
Piecewise linear interpolation of stratigraphic series
Log transformation of stratigraphic series
Interactively identify points in plot
Impulse response function calculation
Generate eccentricity-tilt-precession models
Mann and Lees (1996) robust red noise MTM analysis
Download Laskar et al. (2004, 2011a, 2011b) astronomical solutions
Imbrie and Imbrie (1980) ice sheet model
Multitaper method spectral analysis
Laskar et al. (2004) insolation calculations
Lowpass filter stratigraphic series
Determine the total power within a given bandwidth
Extract record from EHA time-frequency output or eAsm output
Generate noise surrogates from a theoretical power spectrum
generate an insolation map using Laskar et al. (2004) insolation calculations
'Dynamic window' moving average, median and variance of stratigraphic series, using evenly spaced spatial/temporal grid
Determine 'dynamic moving window' for stratigraphic series, adjusting for changing sample density to maintain a window of constant duration
Robust Locally-Weighted Regression Spectral Background Estimation
Intermediate spectrum test of Thomson et al. (2001)
Multitaper Method Spectral Analysis with Power Law (1/f) fit
Set up plots
Prewhiten stratigraphic series with AR1 filter, using 'standard' or unbiased estimate of rho
Adjust spectral p-values for multiple comparisons
Generate power law (1/f) noise surrogates
Remove Gaussian kernel smoother from stratigraphic series
Determine 'dynamic moving window' for stratigraphic series, adjusting for changing sample density to maintain a window of constant duration; output on evenly spaced grid
'Dynamic window' moving average, median and variance of stratigraphic series
'Dynamic window' moving assessment of maxima and minima in stratigraphic series
Example stratigraphic model series
Create lithofacies rank series from bed thickness data
Prewhiten stratigraphic series with autoregressive filter, order selected by Akaike Information Criterion
Set default plotting parameters for vertical stratigraphic plots
Estimate power law (1/f) fit to power spectrum
Create color time-frequency plots from eha results.
Integrate sedimentation rate curve to obtain time-space map
Calculate moving window correlation coefficient for two stratigraphic series, using a 'dynamic window'
Identify optimal spatial/temporal shift to maximize correlation between two stratigraphic/time series.
Identify maxima of peaks in series, filter at desired threshold value
Simple periodogram
Generate phase-randomized surrogate series as in Ebisuzaki (1997)
Evaluate power spectrum false positive rates via Monte Carlo simulation
Astrochronologic testing via the precession amplitude modulation approach of Zeeden et al. (2015).
Pad stratigraphic series with zeros
Fit and remove Lowess smoother from stratigraphic series
Read data from file
Replace values < 0 with 0
Remove missing entries, sort data, average duplicates
Replace values <= 0 with smallest positive value
Ar/Ar Geochronology: Generate an Ar/Ar age spectrum and calculate step-heating plateau age.
Frequency-domain minimal tuning: Use interactive graphical interface to trace frequency drift
TimeOpt analysis using variable sedimentation models
Remove outliers from stratigraphic series
Remove outliers from stratigraphic series
TimeOptTemplatePlot: Generate summary figure for TimeOptTemplate analyses
Standardize variable in stratigraphic series
Apply 'ramping' sedimentation rate model to convert time to stratigraphy
Dynamically explore cross-plot, zoom-in into specified region
Synthesize stratigraphy from forcing function
Generate cross-plot with kernel density estimates on axes
Bioturbation removal function following the approach of Liu et al (2021)
Identify minima of troughs in series, filter at desired threshold value
Tune stratigraphic series
Write CSV file
A tool to interactively trace peak trajectories on plots
TimeOptMCMC: Evaluation of eccentricity-related amplitude modulation and bundling
in paleoclimate data ("TimeOpt"), with uncertainties via Markov-Chain Monte Carlo
TimeOptPlot: Generate summary figure for TimeOpt analyses
Apply Taner bandpass or lowpass filter to stratigraphic series
Apply Taner bandpass or lowpass filter to Fourier coefficients
Resample stratigraphic series
Summary statistics for stratigraphic series
Estimate correlation coefficient and significance for serially correlated data
Remove stratigraphic levels that contain one or more NAs
Astrochronologic testing via the obliquity amplitude modulation approach of Zeeden et al. (2019 submitted).
Read data matrix from file
TimeOpt: Evaluation of eccentricity-related amplitude modulation and bundling in paleoclimate data
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
Monte Carlo simulation for TimeOpt
Monte Carlo simulation for TimeOpt, using power law (1/f) noise
Ar/Ar Geochronology: calculate weighted mean age, age uncertainty, and other associated statistics/plots (with interactive graphics for data culling).
Write tab-delimited file
Simulations for timeOptTemplate
Calculate all possible difference and combinations tones
Average Spectral Misfit
Generate autoregressive moving-average model
Obliquity and precession periods of Berger et al. (1992)
Anchor a floating astrochronology to a radioisotopic age
astrochron: A Computational Tool for Astrochronology
Bandpass filter stratigraphic series
Automatically plot multiple stratigraphic series, with smoothing if desired
Combine multiple vectors
Calculate eccentricity, obliquity and precession periods in ka, given g, s and k in arcsec/yr
bicoherence: Calculate bispectrum and bicoherence using WOSA method as detailed in Choudhury et al. (2008).
Generate AR(1) surrogates
Arcsine transformation of stratigraphic series
Create non-linear response by clipping stratigraphic series
AR(1) + ETP simulation routine