کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4679393 | 1634888 | 2008 | 10 صفحه PDF | دانلود رایگان |
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.
Journal: Earth and Planetary Science Letters - Volume 274, Issues 1–2, 30 September 2008, Pages 179–188