Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.274..179r&link_type=abstract
Earth and Planetary Science Letters, Volume 274, Issue 1-2, p. 179-188.
Computer Science
2
Scientific paper
Parman has recently suggested that a correlation exists between peaks in the ocean island basalt (OIB) 4He/3He distribution and peaks in crustal zircon ages. This correlation is based on matching peaks seen in smooth kernel density estimates. Kernel density estimation is a very useful technique, but care is required when choosing the smoothing bandwidth as spurious peaks can be produced if the bandwidth is too small. Here I provide an introduction to a general statistical technique for determining whether peaks in density estimates are significant, know as SiZer, focusing on its application to the 4He/3He data. SiZer identifies only two statistically significant peaks in the OIB 4He/3He distribution, compared with the eight peaks identified by Parman. The helium-continental crust correlation does not seem to be supported by the current data.
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