Process SD by productivity: a power law in r through two anchors

sd(r) = sd1 * (r / r1)^p with p = log(sd2 / sd1) / log(r2 / r1). Default anchors: sharks (r = 0.057, sd = 0.05) and anchovy (r = 1.2, sd = 0.4), giving sd = 0.355 * r^0.68.

Usage

proc_sd_from_r(r, r1 = 0.057, sd1 = 0.05, r2 = 1.2, sd2 = 0.4)

Arguments

r

intrinsic growth rates.

r1, sd1, r2, sd2

the two anchors.

Value

Process SD (log scale) for each r.