Hawai`i Colonization

This page contains instructions for accessing the Bayesian calibrations described in "A Model-based Age Estimate for Polynesian Colonization of Hawai`i" by Thomas S. Dye.

Table of Contents

1 Establish Account and Login

  • Send an email message to c.e.buck@sheffield.ac.uk with the subject Dye Hawaii Colonization. If you do not have an account on the BCal server, you can leave the body of the message blank. If you do have an account on the BCal server, and you would like the projects copied to a new subdirectory on that account, then put your BCal User code in the body of the email message.
  • You will receive an email reply with a notification that the projects have been copied and, if needed, the information required to login to an account set up for you on the BCal server (fig. bcal-home).


The BCal home page. Note the Login and Tutorial menu selections.

  • Login to the BCal server with the User code and PIN/Password provided in the email reply (fig. bcal-login).


The BCal server user login. Enter the User code and PIN/Password.

2 Access Calibration Projects

  • Go to the directory Hawaii Colonization by selecting it from the drop-down menu and pressing the Change button (fig. bcal-cd).


Change directory to Hawaii Colonization.

  • You will see three projects in the directory: settlement-no-rat, settlement-with-one-rat, and settlement-activity-disp-2 (fig. bcal-3-files).


Projects in the Hawaii Colonization directory.

3 Explore Results

  • Select the project of interest and press the Results button (fig. bcal-results).


The Results page for the settlement-no-rat project.

  • The left panel of Figure 1 in the paper can be reproduced by selecting Individual Parameters (fig. bcal-results).
  • Check the box for the parameter alpha post (fig. bcal-alpha-post).
  • Scroll to the bottom of the window and press Submit.


Selection of alpha post from the parameters of the settlement-no-rat project.

  • View or modify the graph of the posterior probability distribution (fig. bcal-graph).


A posterior probability distribution for Hawai`i colonization.

4 Experiment

Experiments are best carried out on copies of the original projects. This way it is easy to get back to the starting point for a second try, if necessary.

  • Make a copy of a project by pressing the Copy button (fig. bcal-3-files).
  • You can specify a project name (fig. bcal-copy).


Specify a new name for the copied project.

You can get an idea of how an experiment might work by comparing projects in the Hawaii Colonization folder.

  • The project settlement-with-one-rat was created by copying the project settlement-no-rat and adding one rat bone date to the post-colonization period.
  • The project settlement-activity-disp-2 was created by copying the settlement-with-one-rat project and adding a third period.

The BCal Tutorial is a valuable resource.

Date: 2011-06-05 08:37:43 HST

Author: Thomas S. Dye

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