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astrochron (version 0.3.1)

An R Package for Astrochronology

Description

Astrochonologic testing, astronomical time scale development, time series analysis

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Version

Install

install.packages('astrochron')

Monthly Downloads

787

Version

0.3.1

License

GPL-3

Maintainer

Stephen Meyers

Last Published

July 20th, 2014

Functions in astrochron (0.3.1)

arcsinT

Arcsine Transformation of Stratigraphic Series
astrochron-package

astrochron: An R Package for Astrochronology
prewhiteAR

Prewhiten Stratigraphic Series with Autoregressive Filter, Order Selected by Akaike Information Criterion
sedrate2time

Integrate sedimentation rate curve to obtain time-space map
anchorTime

Anchor a floating astrochronology to a radioisotopic age
ar1etp

AR(1) + ETP simulation Routine
asm

Average Spectral Misfit
sedRamp

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

Log Transformation of Stratigraphic Series
hannTaper

Apply Hann Taper to Stratigraphic Series
clipIt

Create non-linear response by clipping stratigraphic series
flip

Flip stratigraphic series
pad

Pad Stratigraphic Series with Zeros
iso

Isolate Data from a Specified Stratigraphic Interval
resample

Resample Stratigraphic Series
gausTaper

Apply Gaussian Taper to Stratigraphic Series
trimAT

Remove Outliers from Stratigraphic Series
demean

Remove Mean Value from Stratigraphic Series
trackFreq

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

Tune stratigraphic series to an astronomical target using graphical interface
hilbert

Hilbert Transform of Stratigraphic Series
extract

Extract record from EHA time-frequency output or eAsm output
periodogram

Simple Periodogram
freq2sedrate

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

Piecewise Linear Interpolation of Stratigraphic Series
divTrend

Divide by Linear Trend in Stratigraphic Series
sortNave

Remove Missing Entries, Sort Data, Average Duplicates
pl

Set Up Plots
getColor

Query R for color information
autoPlot

Automatically plot stratigraphic series, with smoothing if desired
trim

Remove Outliers from Stratigraphic Series
bergerPeriods

Obliquity and Precession Periods of Berger et al. (1992)
modelA

Example stratigraphic model series
lowpass

Lowpass Filter Stratigraphic Series
rankSeries

Create lithofacies rank series from bed thickness data
prewhiteAR1

Prewhiten Stratigraphic Series with AR1 filter, using 'Standard' or Unbiased Estimate of rho
strats

Summary Statistics for Stratigraphic Series
ar1

Generate AR(1) model
eAsmTrack

EXPERIMENTAL: Track ASM Null Hypothesis significance level minima in eASM results
noLow

Fit and Remove Lowess Smoother from Stratigraphic Series
eha

Evolutive Harmonic Analysis
replEps

Replace Values <= 0 with Smallest Positive Value
headn

List Column Numbers for Each Variable
lowspec

Robust Locally-Weighted Regression Spectral Background Estimation
traceFreq

Frequency-domain minimal tuning: Use interactive graphical interface to trace frequency drift
repl0

Replace Values < 0 with 0
tune

Tune Stratigraphic Series
writeCSV

Write CSV File
cb

Combine Multiple Vectors
cosTaper

Apply Cosine Taper to Stratigraphic Series
read

Read Data from File
delPts

Interactively Delete Points in Plot
idPts

Interactively Identify Points in Plot
s

Standardize variable in Stratigraphic Series
noKernel

Remove Gaussian Kernel Smoother from Stratigraphic Series
tones

Calculate all possible difference and combinations tones
armaGen

Generate Autoregressive Moving-average Model
mtm

Multitaper Method Spectral Analysis
peak

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

Write Tab-delimited File
cycles

Generate Harmonic Model
dpssTaper

Apply DPSS Taper to Stratigraphic Series
eAsm

EXPERIMENTAL: Evolutive Average Spectral Misfit
plS

Set default plotting parameters for vertical stratigraphic plots
plotEha

Create color time-frequency plots from eha results
zoomIn

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

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

Bandpass Filter Stratigraphic Series
detrend

Subtract Linear Trend from Stratigraphic Series
readMatrix

Read Data Matrix from File
xplot

Generate Cross-plot with Density Estimates on Axes
etp

Generate Eccentricity-Tilt-Precession Models
laskar

Eccentricity, Tilt and Precession Solutions for the Past 250 Million Years