Stata 15 help for ln1p()
[FN] Mathematical functions
Function
ln1p(x)
Description: the natural logarithm of 1+x with higher precision than
ln(1+x) for small values of |x|
Domain: -1+c(epsdouble) to 8e+307
Range: -37 to 709
log1p(x)
Description: a synonym for ln1p(x)
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