This image [1] comes from "Converson to Islam in the Medieval Period" by Richard Bulliet [2]. The percentages inferred by Bulliet roughly track a sigmoidal curv

This image [1] comes from "Converson to Islam in the Medieval Period" by Richard Bulliet [2]. The percentages inferred by Bulliet roughly track a sigmoidal curve. He makes an argument in analogy to the spread of a disease through a social network. It should be noted that the deta is from Iran, but presumably the same arguments apply for Southeast Asia. [1] http://4.bp.blogspot.com/-69BqAL9ARKg/T1WBF0NwxeI/AAAAAAAAABo/IRxr3nIjSIo/s1600/Bulliet-Iran.gif http://4.bp.blogspot.com/-69BqAL9ARKg/T1WBF0NwxeI/AAAAAAAAAB... [2] http://www.hup.harvard.edu/catalog.php?isbn=9780674732810 http://www.hup.harvard.edu/catalog.php?isbn=9780674732810