'e' in expected values in Poisson

Using this example (see below) could someone please tell me what the 'e' symbol stands for and how one would work out the expected values manually.

'log(λi) = 1.65 + 0.43 × xi
where xi = 1 for a female, and xi = 0 for a male.

Poisson Regression

Using this example, we see that for a female
λFemale = e1.65+0.43 = 8.004
and for males
λMale = e1.65 = 5.2

In other words, the expected value for females is 8.2 and for
males it is 5.2.'


Mean Joe

TS Contributor
e is Euler's number, approximately 2.71828.

You need to exponentiate, e.g. 2.71828 ^ (1.65+0.43) = 8.004

You should actually be able to find the e on a calculator (if that calculator also has pi), instead of typing 2.71828...