Our approach of adding year-specific constant values to the data such that cutpoints based on bimodal distributions
of amyloid concentrations aligned over time removed the drift effect [[beta] (SE) = 0.07 (0.59); P = 0.91; Fig.
Despite efforts to encourage uniform reporting within methods, one can still see that a bimodal distribution
is present in the CG1-B specimen (slightly elevated) in methods 2, 3, and 4, while specimen CG1-C (moderately elevated) demonstrates a bimodal pattern in all 4 methods.
Figure 6 plots frequency distributions of scores and ranks for a normal distribution compared to a symmetric bimodal distribution
having two distinct clusters of scores.
The basis of the bimodal distribution
in hulled oat has been shown to be related to the preponderance of double-kernel spikelets that results in two distinct sub-populations (Doehlert et al., 2005).
Golombok and Rust (1993b) provided split-half reliability for the total sample, and they hailed the value of 0.88 as "robust." However, that value is spuriously high because of the bimodal distribution
of test scores when combining sexes.
in egg size were described in American species of the genus Crepidula (4), in prosobranch gastropods from Danish waters (4), and in echinoid and asteroid echinoderms (14).
It is possible that bimodal distributions
could arise with one mode on either side of zero due to reversals, even with a strongly structured data set.