Systematic uncertainties in the light-element abundances and their evolution complicate a rigorous statistical assessment. However, using Bayesian methods we show that the following statement is robust: The predicted and measured abundances are consistent with 95% credibility only if the baryon-to-photon ratio is between 2 ×{} 10^-10 and 6.5 ×{} 10^-10 and the number of light neutrino species is less than 3.9. Our analysis suggests that the ⁴He abundance may have been systematically underestimated.
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Copi et al. (1995) studied this question.
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