We therefore used two indices of intraspecific variation in sperm morphology: (i) an index of variation in sperm size (log-transformed coefficient of variation, CV, in total length), and (ii) an index of variation in sperm design.
The scores of the first principal component, which explained 85% of the variation in the data, were used in subsequent analysis as the index of variation in sperm design.
Alterations in the fluorescence for Rh123 were quantified using an index of variation (IV) obtained by the equation (MT−MC /MC, where MT is the median of fluorescence for treated parasites and MC is the median of control parasites.
With the addition of CVf (an index of variation in fecundity with age), the relationship becomes Nb /Ne = 0.833 + 0.637 log × (AL) – 0.793 × log – 0.423 × CVf; adjusted r = 0.84.
Overall, our results provide a significant first step in demonstrating that a classic cognitive neuroscience measure can be adapted to serve as a reliable and valid index of variation in creative abilities.
As shown in Figure 3A, instability indices calculated using the relative peak height method generated consistent instability indices (coefficient of variation, 2.2%) from a wide range of template DNA amounts (50~300 ng).
The within-subject variability of the VI indices (coefficient of variation in brackets) was distinctly higher (LCI (9.8%), M1/M0 (6.6%), M2/M0 (14.6%), AMDN1 (9.1%), AMDN2 (16.3%)) compared to FRC measurements (5.6%).
Subsequent studies show that this method produces repeatable dyssynchrony indices (coefficient of variation is 8.7% for bandwidth and 8.8% for SD of time to peak contraction) and can distinguish normal from dyssynchronous contraction in clinical populations [ 18, 21].
