Observer error, dental wear, and the inference of new world sundadonty

Christopher Stojanowski, Kent M. Johnson

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Dental morphology provides important information on human evolution and interpopulation relationships. Dental wear is one of the major limitations of morphological data analysis. Wear figures heavily in existing debates about patterns of New World dental variation with some scholars finding evidence for a more generalized dentition in early New World populations (Powell: Doctoral Dissertation, Texas A&M University, TX (1995)) and others questioning these findings based on the probable effects of dental wear on trait scores (Turner, The First Americans: the Pleistocene Colonization of the New World. San Francisco: California Academy of Sciences (2002) 123-158; Turner: Am J Phys Anthropol 130 (2006) 455-461; Turner and Scott, Handbook of paleoanthropology, Vol. Ill: Phylogeny of Homi-nids. New York: Springer (2007) 1901-1941). Here we evaluate these competing claims using data from the Early Archaic Windover sample. Results confirm the dental distinctiveness of Windover with respect to other Old World Asian (i.e., sinodont/sundadont) populations. However, comparison of our results to those of Powell (1995) also highlights significant interobserver error. Statistical analysis of matched wear and morphology scores suggests trait downgrading for some traits. Patterns of missing data present a more challenging (and potentially serious) problem. Use of Little's MCAR test for missing data mechanisms indicates a complex process of data collection in which incidental and opportunistic recording of both highly worn and unerupted teeth introduce a "missing not at random" mechanism into our dataset that biases dental trait frequencies. We conclude that patterns of missingness and formal research designs for "planned missingness" are needed to help mitigate this bias.

Original languageEnglish (US)
Pages (from-to)349-362
Number of pages14
JournalAmerican Journal of Physical Anthropology
Volume156
Issue number3
DOIs
StatePublished - Mar 1 2015

Fingerprint

Tooth Wear
Tooth
phylogeny
Unerupted Tooth
Academy of Sciences
earning a doctorate
trend
colonization
statistical analysis
research planning
Dentition
San Francisco
recording
data analysis
Phylogeny
Population
Research Design
evidence

Keywords

  • Dental morphology
  • Dental wear
  • Observer error
  • Sinodonty
  • Windover pond

ASJC Scopus subject areas

  • Anthropology
  • Anatomy

Cite this

Observer error, dental wear, and the inference of new world sundadonty. / Stojanowski, Christopher; Johnson, Kent M.

In: American Journal of Physical Anthropology, Vol. 156, No. 3, 01.03.2015, p. 349-362.

Research output: Contribution to journalArticle

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