rice 0.4.0

• 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 Since these rely on the outdated ‘intercept calibration’ method, these functions are provided for illustrative purposes only.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

• 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

• 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

• 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.