NEWS
rice 1.0.0 (2025-01-07)
- corrected a bug in
C14topMC where errors were not calculated correctly.
- caldist now always glues a postbomb curve to a prebomb if postbomb is not FALSE.
- new functions
push.normal and push.gamma to push a date to younger or older ages by adding/subtracting a normal resp. gamma distribution.
- reservoir effect (deltaR, deltaSTD) options have been added to functions where this is relevant.
- added more warnings to
calibrate for very old dates.
- calibrated distributions are now plotted more consistently between functions.
- added uncertainty estimates to the
clean, contaminate and muck functions, using Monte Carlo-based sampling.
- Some of the
realm functions translating to D14C space didn't handle multiple entries well. This should work correctly now.
find.shells and map.shells now deal better with missing mapping-related packages
rice 0.4.0 (2024-10-29)
- the
contaminate function now also produces a plot, and more details of the calculations.
- the
decontaminate function has been renamed to clean and has been updated with clearer messages; it now removes contamination to calculate the true/target age. A plot is made, and calculation details are provided.
- new function
muck to calculate how much contamination has to be inferred to go from an observed age to a true/target age. A plot is made, and calculation details are provided.
- new functions
C14tocalBP and C14toBCAD. Since these rely on the outdated 'intercept calibration' method, these functions are provided for illustrative purposes only.
- draw.dates can now also plot the dates on the calibration curve, using the
oncurve option. If so, then the curve and dates can also be plotted in the F14C or pMC realms.
- New function
r.calib that samples random calendar ages from a calibrated distribution.
- new function
p.range to calculate a calibrated age's probability of lying between a range of BC/AD or cal BP ages.
- new function
as.one to calculate the product of multiple calibrated ages, assuming that they all stem from (exactly) the same calendar age. Not that this is dangerous, and care should be taken to make sure that the assumptions are met.
- new function
as.bin to calculate how many of a set of calibrated radiocarbon dates fall into bins of a specified width. The bin moves along the range of calibrated ages, to visualise how many dates fit bins over time. This would be safer than using the function as.one.
- new function
spread shows the spread (in calendar years) of a set of dates. Accompanies the functions pool and as.one.
rice 0.3.0 (2024-10-21)
- hpd ranges are now calculated at a specified precision (defaults to yearly)
- new function
BCADto14C to calculate the 14C age belonging to a BC/AD age (this calls the function calBPto14C)
- new option
as.F to calibrate in the F14C realm (the default remains to calibrate in the C14 realm)
- warnings are printed on calibrate() plots if dates are truncated and edge=TRUE (with the default edge=FALSE, dates that are truncated are not calibrated). The printed warning can be removed by setting
print.truncate.warning=FALSE
- renaming
age.F14C, F14C.age, age.pMC and pMC.age to, respectively, C14toF14C, F14CtoC14, C14topMC and pMCtoC14. This because age is an ambivalent term in this context
- new functions
BCADtocalBP and calBPtoBCAD to transfer cal BP into BC/AD ages and vice versa. Can deal with (e.g. Gregorian/Julian) calendars which do not include 0
- new functions to translate between any of the realms
calBP, BCAD, C14, F14C, pMC and D14C.
- new function
smooth.ccurve to smooth a calibration curve using a moving window of a specified width. This can be useful to calibrate material that is known to have accumulated, say, over two decades
- new function
pool which calculates the chi2 and accompanying p-value for a set of multiple measurements on the same sample. If the scatter between the values is low enough for the p-value to be below a threshold, then the pooled mean and uncertainty are returned
- the function draw.dates now has an option
oncurve to draw the dates onto the calibration curve.
- added dataset
shroud, which contains replicate radiocarbon measurements on the Shroud of Turin, from three labs.
- new function
decontaminate to estimate the percentage of contamination needed to explain the difference between a 'real' and an 'observed' radiocarbon age.
rice 0.2.0 (2024-09-24)
- added an option
bombalert to the calibrate function. If set to false, plots ages close to 0 C14 BP without warnings.
- added the data from the marine database (calib.org/marine), as data
shells
- new functions
find.shells and map.shells to plot shells data in maps based on their coordinates
- new function
shells.mean to plot deltaRs of selected shells, and calculate a weighted mean deltaR
- new function
weighted_means to calculate weighted means and errors for multiple radiocarbon dates (or delta R values)
- repaired a bug in
draw.D14C
draw.ccurve now can plot the C14 in the 'realms' of C14 BP, F14C, pMC and D14C using the 'realm' option.
rice 0.1.1 (2024-09-02)
- added citation information
- added a function
older
- added a vignette
rice 0.1.0
- The first release of the rice package. It separates the calibration functions from its parent data package rintcal, which in the future will contain the IntCal and other calibration curve data only.