Before proceeding with this pull request, make sure #156 is already closed and merged, to see only limited subset of changes. Otherwise you will see a lot of stuff unrelated to current changeset.
I've introduced few new exceptions. Some of them are general ones and placed in libException. In order to implement Cohen's D effect size, variance for two samples needs to be computed - it's implemented here as well.
gmrukwa
commented
6 years ago 
Before proceeding with this pull request, make sure #156 is already closed and merged, to see only limited subset of changes. Otherwise you will see a lot of stuff unrelated to current changeset.
I've introduced few new exceptions. Some of them are general ones and placed in
libException. In order to implement Cohen's D effect size, variance for two samples needs to be computed - it's implemented here as well.