This function performs an approximate log-transformation (base e) of a
a paleontological time series
For a random variable x, its approximate mean on a log scale is the log of its untransformed mean. The approximate variance on a log scale is equal to the squared coefficient of variation.
Hunt, G. 2006. Fitting and comparing models of phyletic evolution: random walks and beyond. Paleobiology 32:578–601.
Lewontin, R. 1966. On the measurement of relative variability. Systematic Zoology 15:141–142.
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