Log of number to specific base

[Hans Schubert]

Hello,

I have a number
0.06897

I'm looking for its log to the base 15

In Excel for example I would enter the formula =log(0.06897,15) to return -0.9875

How can I do this in Stata please, cant find anything online.

Thanks

[Hans Schubert]

Solved it...

gen log_probability = ln(var)/ln(15)

[Nick Cox]

In Stata only natural logarithms and logarithms base 10 are specifically supported, presumably on the grounds that using any other base implies only a scaling factor.

. di log10(225)/log10(15)
2

. di ln(225)/ln(15)
2

. di ln(0.06897) / ln(15)
-.98745719

[Daniel Feenberg]

. local x=log(0.06897)/log(15)
. di "`x'"
-.987457193537458

See, for example https://www.khanacademy.org/math/alg...ase-rule-intro

[Hans Schubert]

Thanks, good information.