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