Country Date of Introduction N pairs Mean Change Variance Change
Introduced
Australia 1860s 3 0.059 0.002
Canada 1900s 6 -1.511 13.179
Senegal 1970s 6 12.994 388.840
Native
Israel 6 0.055 0.013
Norway 6 -0.455 1.783
Spain 6 0.006 0.023
Vietnam 6 -0.012 0.017