A quick refresher on logarithms. Just the basics, and not a whole lot more. Explains what logarithm means, how it is related to e, how to add/subtract logs and convert bases.

You need to know the basics of log operations. Here is a quick refresher**Remember the basics:**

If e^{POWER} = NUMBER,

then POWER = LN(NUMBER)

and EXP(POWER) = NUMBER

LN and EXP are both Excel functions. LN is the same as LOG, except that it is to the base e. (ie, LN(x) = LOG_{e}(x) ).

**Basic operations:**

Adding logarithms is like multiplying numbers, and subtracting logs is like dividing numbers.

log_{a}(mn)=log_{a}(m) + log_{a}(n)

log_{a}(m/n)=log_{a}(m) – log_{a}(n)

Also,log_{a}(x^{y} )= y log_{a}(x)

**Converting log bases:**

If we know the log of a number in a particular base, we can convert it to another log base quite easily.

If x = log_{a}(m)

Then x = log_{b}(m)/log_{b}(a)

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