Isotropic edge correction unbiasedness

Hi All,


Using `kest` to estimate a ripley's K for a country. The authors of the
package suggest isotropic is best when computationally tractable for
irregular shapes, but I noticed in Ripley (1988) that this correction is
only "unbiased provided E is convex", where E is the boundaries of study.

With that said, the picture in Ripley (1988) illustrating this correction
is NOT convex (it's a kidney shape).

I know this isn't quite an "r-implementation" question, but: anyone know if
isotropic correction is unbiased for an odd shape like a country-outline
(in this case Sweden)? Or should i use the `border` correction?

Thanks!

Nick