R: Using equation with natural logarithm in nls

In R, log is the natural logarithm. In calculators, log usually means base 10 logarithm. To achieve that in R you can use the log10 function.

log(5)
## [1] 1.609438
log10
## [1] 0.69897(5)

As for your formula, it seems correct, since log is the natural logarithm.

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