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Basic age-modelling. Find ages for dated and undated depths E.g., linear interpolation, regression, spline (gaps) Choose which one looks nicest... How treat point estimates? (mid/max, multimodal) ‏. Bayesian age-modelling. Bayesian = combine data with other info 14 C dates and depth info

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slide1

Basic age-modelling

  • Find ages for dated and undated depths
  • E.g., linear interpolation, regression, spline (gaps)
  • Choose which one looks nicest...
  • How treat point estimates? (mid/max, multimodal)‏
slide2

Bayesian age-modelling

  • Bayesian = combine data with other info
    • 14C dates and depth info
    • stratigraphical ordering / position
      • e.g., wiggle-match dating
    • Constraints on e.g. likely accumulation rates
    • Other dates, e.g. pollen events, 210Pb (…)
    • Outlier analysis
  • Usually done by millions of simulations
slide4

Outlier analysis

  • Reasons: site, error, lab?
  • Give prior outlier probabilities to dates
  • Iteration i: is date within 2 lengths sd?
  • If not, label date and shift to fit
  • [Labelled / total]  posterior outlier prob.
  • No need to remove outliers!
  • Fit F: 1 – mean(posterior outlier prob.)‏
slide5

OxCal

  • Extract OxCal directory to C:\Program Files
  • Open .../OxCal/Index.html in Firefox
  • R_Date( “test”, 2450, 50);
  • Save file, run
  • Run examples from manual
slide6

Bpeat

  • Extract Bpeat.zip somewhere
  • Open R there (or change dir)
  • source(“Bpeat.R”)
  • SetCore(“MSB2K”,2)
  • TestRun()
  • FinalRun( 0.1 ) # just a short run...
  • DepthChron()
slide8

Bacon

  • Muscles and fat – robust, yet flexible
  • Floppy/crusty – flexibility can be adapted
  • Can be cut to your liking – hiatuses
  • Cured – Bpeat bugs repaired
  • MacBacon – multi-platform
  • Pigs are smart – combine prior info + new data
  • Pigs can fly – workshop in Mexico
slide9

Age-modelling … your own data?

  • Try the different software pieces
  • What are best settings for your site?
  • Do you agree with the age estimates?
  • Differences between approaches