Does Box-Cox parameter estimation ever arrive at lambda=0? Such that the recommended transform is a log function? Or is that possibility just a mathematical nicety to make the function continuous, but one that rarely gets used in practice?

I ask because I have been trying to test a Box Cox transform in R to see if it estimates `lambda==0` when appropriate:

```
> require(car)
> x <- exp(qnorm(runif(1000))) # 1000 numbers from a normal distribution then exp()
> p = powerTransform(x)
> p
Estimated transformation parameters
     x
-0.1098415
# clearly this does not equal zero

```