A Computational Tool for Astrochronology

anchorTime | Anchor a floating astrochronology to a radioisotopic age |

ar1 | Generate AR(1) surrogates |

ar1etp | AR(1) + ETP simulation routine |

arcsinT | Arcsine transformation of stratigraphic series |

armaGen | Generate autoregressive moving-average model |

asm | Average Spectral Misfit |

astrochron-package | astrochron: A Computational Tool for Astrochronology |

autoPlot | Automatically plot multiple stratigraphic series, with... |

bandpass | Bandpass filter stratigraphic series |

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

cb | Combine multiple vectors |

clipIt | Create non-linear response by clipping stratigraphic series |

constantSedrate | Apply a constant sedimentation rate model to transform a... |

cosTaper | Apply cosine taper to stratigraphic series |

cycles | Generate harmonic model |

delPts | Interactively delete points in plot |

demean | Remove mean value from stratigraphic series |

detrend | Subtract linear trend from stratigraphic series |

divTrend | Divide by linear trend in stratigraphic series |

dpssTaper | Apply DPSS taper to stratigraphic series |

eAsm | Evolutive Average Spectral Misfit |

eAsmTrack | Track ASM null hypothesis significance level minima in eASM... |

eha | Evolutive Harmonic Analysis & Evolutive Power Spectral... |

etp | Generate eccentricity-tilt-precession models |

extract | Extract record from EHA time-frequency output or eAsm output |

flip | Flip stratigraphic series |

freq2sedrate | Convert record of local spatial frequency (from EHA) to... |

gausTaper | Apply Gaussian taper to stratigraphic series |

getColor | Query R for color information |

getData | Download file from astrochron data server |

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

hannTaper | Apply Hann taper to stratigraphic series |

headn | List column numbers for each variable |

hilbert | Hilbert transform of stratigraphic series |

idPts | Interactively identify points in plot |

integratePower | Determine the total power within a given bandwidth |

iso | Isolate data from a specified stratigraphic interval |

linage | Tune stratigraphic series to an astronomical target using... |

linterp | Piecewise linear interpolation of stratigraphic series |

logT | Log transformation of stratigraphic series |

lowpass | Lowpass filter stratigraphic series |

lowspec | Robust Locally-Weighted Regression Spectral Background... |

modelA | Example stratigraphic model series |

mtm | Multitaper method spectral analysis |

mtmAR | Intermediate spectrum test of Thomson et al. (2001) |

mtmML96 | Mann and Lees (1996) robust red noise MTM analysis |

mwCor | Calculate moving window correlation coefficient for two... |

mwin | Determine 'dynamic moving window' for stratigraphic series |

mwStats | 'Dynamic window' moving average, median and standard... |

noKernel | Remove Gaussian kernel smoother from stratigraphic series |

noLow | Fit and remove Lowess smoother from stratigraphic series |

pad | Pad stratigraphic series with zeros |

peak | Identify maxima of peaks in series, filter at desired... |

periodogram | Simple periodogram |

pl | Set up plots |

plotEha | Create color time-frequency plots from eha results. |

plS | Set default plotting parameters for vertical stratigraphic... |

prewhiteAR | Prewhiten stratigraphic series with autoregressive filter,... |

prewhiteAR1 | Prewhiten stratigraphic series with AR1 filter, using... |

rankSeries | Create lithofacies rank series from bed thickness data |

read | Read data from file |

readMatrix | Read data matrix from file |

repl0 | Replace values < 0 with 0 |

replEps | Replace values <= 0 with smallest positive value |

resample | Resample stratigraphic series |

rmNA | Remove stratigraphic levels that contain one or more NAs |

s | Standardize variable in stratigraphic series |

sedRamp | Apply 'ramping' sedimentation rate model to convert time to... |

sedrate2time | Integrate sedimentation rate curve to obtain time-space map |

slideCor | Identify optimal spatial/temporal shift to maximize... |

sortNave | Remove missing entries, sort data, average duplicates |

stepHeat | Ar/Ar Geochronology: Generate an Ar/Ar age spectrum and... |

strats | Summary statistics for stratigraphic series |

surrogateCor | Estimate correlation coefficient and significance for... |

surrogates | Generate phase-randomized surrogate series as in Ebisuzaki... |

taner | Apply Taner bandpass or lowpass filter to stratigraphic... |

testPrecession | Astrochronologic testing via the amplitude modulation... |

timeOpt | TimeOpt: Evaluation of eccentricity-related amplitude... |

timeOptPlot | TimeOptPlot: Generate summary figure for TimeOpt analyses |

timeOptSim | Monte Carlo simulation for TimeOpt |

tones | Calculate all possible difference and combinations tones |

traceFreq | Frequency-domain minimal tuning: Use interactive graphical... |

trackFreq | Frequency-domain minimal tuning: Use interactive graphical... |

trim | Remove outliers from stratigraphic series |

trimAT | Remove outliers from stratigraphic series |

trough | Identify minima of troughs in series, filter at desired... |

tune | Tune stratigraphic series |

writeCSV | Write CSV file |

writeT | Write tab-delimited file |

wtMean | Ar/Ar Geochronology: calculate weighted mean age, age... |

xplot | Generate cross-plot with density estimates on axes |

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

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